[Plugin] Allow custom plugins for running validation routines (#3776)

* Adds new plugin mixin for performing custom validation steps

* Adds simple test plugin for custom validation

* Run part name and IPN validators checks through loaded plugins

* Expose more validation functions to plugins:

- SalesOrder reference
- PurchaseOrder reference
- BuildOrder reference

* Remove custom validation of reference fields

- For now, this is too complex to consider given the current incrementing-reference implementation
- Might revisit this at a later stage.

* Custom validation of serial numbers:

- Replace "checkIfSerialNumberExists" method with "validate_serial_number"
- Pass serial number through to custom plugins
- General code / docstring improvements

* Update unit tests

* Update InvenTree/stock/tests.py

Co-authored-by: Matthias Mair <code@mjmair.com>

* Adds global setting to specify whether serial numbers must be unique globally

- Default is false to preserve behaviour

* Improved error message when attempting to create stock item with invalid serial numbers

* Add more detail to existing serial error message

* Add unit testing for serial number uniqueness

* Allow plugins to convert a serial number to an integer (for optimized sorting)

* Add placeholder plugin methods for incrementing and decrementing serial numbers

* Typo fix

* Add improved method for determining the "latest" serial number

* Remove calls to getLatestSerialNumber

* Update validate_serial_number method

- Add option to disable checking for duplicates
- Don't pass optional StockItem through to plugins

* Refactor serial number extraction methods

- Expose the "incrementing" portion to external plugins

* Bug fixes

* Update unit tests

* Fix for get_latest_serial_number

* Ensure custom serial integer values are clipped

* Adds a plugin for validating and generating hexadecimal serial numbers

* Update unit tests

* Add stub methods for batch code functionality

* remove "hex serials" plugin

- Was simply breaking unit tests

* Allow custom plugins to generate and validate batch codes

- Perform batch code validation when StockItem is saved
- Improve display of error message in modal forms

* Fix unit tests for stock app

* Log message if plugin has a duplicate slug

* Unit test fix

Co-authored-by: Matthias Mair <code@mjmair.com>

InvenTree/InvenTree/helpers.py

@@ -342,7 +342,7 @@ def normalize(d):
     return d.quantize(Decimal(1)) if d == d.to_integral() else d.normalize()
 
 
-def increment(n):
+def increment(value):
     """Attempt to increment an integer (or a string that looks like an integer).
 
     e.g.
@@ -351,12 +351,14 @@ def increment(n):
     2 -> 3
     AB01 -> AB02
     QQQ -> QQQ
+
     """
-    value = str(n).strip()
+    value = str(value).strip()
 
     # Ignore empty strings
-    if not value:
+    if value in ['', None]:
-        return value
+        # Provide a default value if provided with a null input
+        return '1'
 
     pattern = r"(.*?)(\d+)?$"
 
@@ -542,138 +544,211 @@ def DownloadFile(data, filename, content_type='application/text', inline=False)
     return response
 
 
-def extract_serial_numbers(serials, expected_quantity, next_number: int):
+def increment_serial_number(serial: str):
-    """Attempt to extract serial numbers from an input string.
+    """Given a serial number, (attempt to) generate the *next* serial number.
 
-    Requirements:
+    Note: This method is exposed to custom plugins.
-        - Serial numbers can be either strings, or integers
-        - Serial numbers can be split by whitespace / newline / commma chars
-        - Serial numbers can be supplied as an inclusive range using hyphen char e.g. 10-20
-        - Serial numbers can be defined as ~ for getting the next available serial number
-        - Serial numbers can be supplied as <start>+ for getting all expecteded numbers starting from <start>
-        - Serial numbers can be supplied as <start>+<length> for getting <length> numbers starting from <start>
 
-    Args:
+    Arguments:
-        serials: input string with patterns
+        serial: The serial number which should be incremented
-        expected_quantity: The number of (unique) serial numbers we expect
+
-        next_number(int): the next possible serial number
+    Returns:
+        incremented value, or None if incrementing could not be performed.
     """
-    serials = serials.strip()
 
-    # fill in the next serial number into the serial
+    from plugin.registry import registry
-    while '~' in serials:
-        serials = serials.replace('~', str(next_number), 1)
-        next_number += 1
 
-    # Split input string by whitespace or comma (,) characters
+    # Ensure we start with a string value
-    groups = re.split(r"[\s,]+", serials)
+    if serial is not None:
+        serial = str(serial).strip()
 
-    numbers = []
+    # First, let any plugins attempt to increment the serial number
-    errors = []
+    for plugin in registry.with_mixin('validation'):
+        result = plugin.increment_serial_number(serial)
+        if result is not None:
+            return str(result)
 
-    # Helper function to check for duplicated numbers
+    # If we get to here, no plugins were able to "increment" the provided serial value
-    def add_sn(sn):
+    # Attempt to perform increment according to some basic rules
-        # Attempt integer conversion first, so numerical strings are never stored
+    return increment(serial)
-        try:
-            sn = int(sn)
-        except ValueError:
-            pass
 
-        if sn in numbers:
+
-            errors.append(_('Duplicate serial: {sn}').format(sn=sn))
+def extract_serial_numbers(input_string, expected_quantity: int, starting_value=None):
-        else:
+    """Extract a list of serial numbers from a provided input string.
-            numbers.append(sn)
+
+    The input string can be specified using the following concepts:
+
+    - Individual serials are separated by comma: 1, 2, 3, 6,22
+    - Sequential ranges with provided limits are separated by hyphens: 1-5, 20 - 40
+    - The "next" available serial number can be specified with the tilde (~) character
+    - Serial numbers can be supplied as <start>+ for getting all expecteded numbers starting from <start>
+    - Serial numbers can be supplied as <start>+<length> for getting <length> numbers starting from <start>
+
+    Actual generation of sequential serials is passed to the 'validation' plugin mixin,
+    allowing custom plugins to determine how serial values are incremented.
+
+    Arguments:
+        input_string: Input string with specified serial numbers (string, or integer)
+        expected_quantity: The number of (unique) serial numbers we expect
+        starting_value: Provide a starting value for the sequence (or None)
+    """
+
+    if starting_value is None:
+        starting_value = increment_serial_number(None)
 
     try:
         expected_quantity = int(expected_quantity)
     except ValueError:
         raise ValidationError([_("Invalid quantity provided")])
 
-    if len(serials) == 0:
+    if input_string:
+        input_string = str(input_string).strip()
+    else:
+        input_string = ''
+
+    if len(input_string) == 0:
         raise ValidationError([_("Empty serial number string")])
 
-    # If the user has supplied the correct number of serials, don't process them for groups
+    next_value = increment_serial_number(starting_value)
-    # just add them so any duplicates (or future validations) are checked
+
+    # Substitute ~ character with latest value
+    while '~' in input_string and next_value:
+        input_string = input_string.replace('~', str(next_value), 1)
+        next_value = increment_serial_number(next_value)
+
+    # Split input string by whitespace or comma (,) characters
+    groups = re.split(r"[\s,]+", input_string)
+
+    serials = []
+    errors = []
+
+    def add_error(error: str):
+        """Helper function for adding an error message"""
+        if error not in errors:
+            errors.append(error)
+
+    def add_serial(serial):
+        """Helper function to check for duplicated values"""
+        if serial in serials:
+            add_error(_("Duplicate serial") + f": {serial}")
+        else:
+            serials.append(serial)
+
+    # If the user has supplied the correct number of serials, do not split into groups
     if len(groups) == expected_quantity:
         for group in groups:
-            add_sn(group)
+            add_serial(group)
 
         if len(errors) > 0:
             raise ValidationError(errors)
-
+        else:
-        return numbers
+            return serials
 
     for group in groups:
         group = group.strip()
 
-        # Hyphen indicates a range of numbers
         if '-' in group:
+            """Hyphen indicates a range of values:
+            e.g. 10-20
+            """
             items = group.split('-')
 
-            if len(items) == 2 and all([i.isnumeric() for i in items]):
+            if len(items) == 2:
-                a = items[0].strip()
+                a = items[0]
-                b = items[1].strip()
+                b = items[1]
 
-                try:
+                if a == b:
-                    a = int(a)
+                    # Invalid group
-                    b = int(b)
+                    add_error(_("Invalid group range: {g}").format(g=group))
-
-                    if a < b:
-                        for n in range(a, b + 1):
-                            add_sn(n)
-                    else:
-                        errors.append(_("Invalid group range: {g}").format(g=group))
-
-                except ValueError:
-                    errors.append(_("Invalid group: {g}").format(g=group))
                     continue
-            else:
-                # More than 2 hyphens or non-numeric group so add without interpolating
-                add_sn(group)
 
-        # plus signals either
+                group_items = []
-        # 1:  'start+':  expected number of serials, starting at start
+
-        # 2:  'start+number': number of serials, starting at start
+                count = 0
+
+                a_next = a
+
+                while a_next is not None and a_next not in group_items:
+                    group_items.append(a_next)
+                    count += 1
+
+                    # Progress to the 'next' sequential value
+                    a_next = str(increment_serial_number(a_next))
+
+                    if a_next == b:
+                        # Successfully got to the end of the range
+                        group_items.append(b)
+                        break
+
+                    elif count > expected_quantity:
+                        # More than the allowed number of items
+                        break
+
+                    elif a_next is None:
+                        break
+
+                if len(group_items) > 0 and group_items[0] == a and group_items[-1] == b:
+                    # In this case, the range extraction looks like it has worked
+                    for item in group_items:
+                        add_serial(item)
+                else:
+                    add_serial(group)
+                    # add_error(_("Invalid group range: {g}").format(g=group))
+
+            else:
+                # In the case of a different number of hyphens, simply add the entire group
+                add_serial(group)
+
         elif '+' in group:
+            """Plus character (+) indicates either:
+            - <start>+ - Expected number of serials, beginning at the specified 'start' character
+            - <start>+<num> - Specified number of serials, beginning at the specified 'start' character
+            """
             items = group.split('+')
 
-            # case 1, 2
+            sequence_items = []
-            if len(items) == 2:
+            counter = 0
-                start = int(items[0])
+            sequence_count = max(0, expected_quantity - len(serials))
 
-                # case 2
+            if len(items) > 2 or len(items) == 0:
-                if bool(items[1]):
+                add_error(_("Invalid group sequence: {g}").format(g=group))
-                    end = start + int(items[1]) + 1
+                continue
+            elif len(items) == 2:
+                try:
+                    if items[1] not in ['', None]:
+                        sequence_count = int(items[1]) + 1
+                except ValueError:
+                    add_error(_("Invalid group sequence: {g}").format(g=group))
+                    continue
 
-                # case 1
+            value = items[0]
-                else:
-                    end = start + (expected_quantity - len(numbers))
 
-                for n in range(start, end):
+            # Keep incrementing up to the specified quantity
-                    add_sn(n)
+            while value is not None and value not in sequence_items and counter < sequence_count:
-            # no case
+                sequence_items.append(value)
+                value = increment_serial_number(value)
+                counter += 1
+
+            if len(sequence_items) == sequence_count:
+                for item in sequence_items:
+                    add_serial(item)
             else:
-                errors.append(_("Invalid group sequence: {g}").format(g=group))
+                add_error(_("Invalid group sequence: {g}").format(g=group))
 
-        # At this point, we assume that the "group" is just a single serial value
-        elif group:
-            add_sn(group)
-
-        # No valid input group detected
         else:
-            raise ValidationError(_(f"Invalid/no group {group}"))
+            # At this point, we assume that the 'group' is just a single serial value
+            add_serial(group)
 
     if len(errors) > 0:
         raise ValidationError(errors)
 
-    if len(numbers) == 0:
+    if len(serials) == 0:
         raise ValidationError([_("No serial numbers found")])
 
-    # The number of extracted serial numbers must match the expected quantity
+    if len(serials) != expected_quantity:
-    if expected_quantity != len(numbers):
+        raise ValidationError([_("Number of unique serial numbers ({s}) must match quantity ({q})").format(s=len(serials), q=expected_quantity)])
-        raise ValidationError([_("Number of unique serial numbers ({s}) must match quantity ({q})").format(s=len(numbers), q=expected_quantity)])
 
-    return numbers
+    return serials
 
 
 def validateFilterString(value, model=None):

InvenTree/InvenTree/static/css/inventree.css

@@ -679,6 +679,10 @@ main {
     color: #A94442;
 }
 
+.form-error-message {
+    display: block;
+}
+
 .modal input {
     width: 100%;
 }

InvenTree/InvenTree/tests.py

@@ -39,8 +39,9 @@ class ValidatorTest(TestCase):
         """Test part name validator."""
         validate_part_name('hello world')
 
+        # Validate with some strange chars
         with self.assertRaises(django_exceptions.ValidationError):
-            validate_part_name('This | name is not } valid')
+            validate_part_name('### <> This | name is not } valid')
 
     def test_overage(self):
         """Test overage validator."""
@@ -309,7 +310,7 @@ class TestIncrement(TestCase):
     def tests(self):
         """Test 'intelligent' incrementing function."""
         tests = [
-            ("", ""),
+            ("", '1'),
             (1, "2"),
             ("001", "002"),
             ("1001", "1002"),
@@ -418,7 +419,11 @@ class TestMPTT(TestCase):
 
 
 class TestSerialNumberExtraction(TestCase):
-    """Tests for serial number extraction code."""
+    """Tests for serial number extraction code.
+
+    Note that while serial number extraction is made available to custom plugins,
+    only simple integer-based extraction is tested here.
+    """
 
     def test_simple(self):
         """Test simple serial numbers."""
@@ -427,7 +432,7 @@ class TestSerialNumberExtraction(TestCase):
         sn = e("1-5", 5, 1)
         self.assertEqual(len(sn), 5, 1)
         for i in range(1, 6):
-            self.assertIn(i, sn)
+            self.assertIn(str(i), sn)
 
         sn = e("1, 2, 3, 4, 5", 5, 1)
         self.assertEqual(len(sn), 5)
@@ -435,55 +440,55 @@ class TestSerialNumberExtraction(TestCase):
         # Test partially specifying serials
         sn = e("1, 2, 4+", 5, 1)
         self.assertEqual(len(sn), 5)
-        self.assertEqual(sn, [1, 2, 4, 5, 6])
+        self.assertEqual(sn, ['1', '2', '4', '5', '6'])
 
         # Test groups are not interpolated if enough serials are supplied
         sn = e("1, 2, 3, AF5-69H, 5", 5, 1)
         self.assertEqual(len(sn), 5)
-        self.assertEqual(sn, [1, 2, 3, "AF5-69H", 5])
+        self.assertEqual(sn, ['1', '2', '3', 'AF5-69H', '5'])
 
         # Test groups are not interpolated with more than one hyphen in a word
         sn = e("1, 2, TG-4SR-92, 4+", 5, 1)
         self.assertEqual(len(sn), 5)
-        self.assertEqual(sn, [1, 2, "TG-4SR-92", 4, 5])
+        self.assertEqual(sn, ['1', '2', "TG-4SR-92", '4', '5'])
 
         # Test groups are not interpolated with alpha characters
         sn = e("1, A-2, 3+", 5, 1)
         self.assertEqual(len(sn), 5)
-        self.assertEqual(sn, [1, "A-2", 3, 4, 5])
+        self.assertEqual(sn, ['1', "A-2", '3', '4', '5'])
 
         # Test multiple placeholders
-        sn = e("1 2 ~ ~ ~", 5, 3)
+        sn = e("1 2 ~ ~ ~", 5, 2)
         self.assertEqual(len(sn), 5)
-        self.assertEqual(sn, [1, 2, 3, 4, 5])
+        self.assertEqual(sn, ['1', '2', '3', '4', '5'])
 
         sn = e("1-5, 10-15", 11, 1)
-        self.assertIn(3, sn)
+        self.assertIn('3', sn)
-        self.assertIn(13, sn)
+        self.assertIn('13', sn)
 
         sn = e("1+", 10, 1)
         self.assertEqual(len(sn), 10)
-        self.assertEqual(sn, [_ for _ in range(1, 11)])
+        self.assertEqual(sn, [str(_) for _ in range(1, 11)])
 
         sn = e("4, 1+2", 4, 1)
         self.assertEqual(len(sn), 4)
-        self.assertEqual(sn, [4, 1, 2, 3])
+        self.assertEqual(sn, ['4', '1', '2', '3'])
 
         sn = e("~", 1, 1)
         self.assertEqual(len(sn), 1)
-        self.assertEqual(sn, [1])
+        self.assertEqual(sn, ['2'])
 
         sn = e("~", 1, 3)
         self.assertEqual(len(sn), 1)
-        self.assertEqual(sn, [3])
+        self.assertEqual(sn, ['4'])
 
-        sn = e("~+", 2, 5)
+        sn = e("~+", 2, 4)
         self.assertEqual(len(sn), 2)
-        self.assertEqual(sn, [5, 6])
+        self.assertEqual(sn, ['5', '6'])
 
-        sn = e("~+3", 4, 5)
+        sn = e("~+3", 4, 4)
         self.assertEqual(len(sn), 4)
-        self.assertEqual(sn, [5, 6, 7, 8])
+        self.assertEqual(sn, ['5', '6', '7', '8'])
 
     def test_failures(self):
         """Test wron serial numbers."""
@@ -522,19 +527,19 @@ class TestSerialNumberExtraction(TestCase):
 
         sn = e("1 3-5 9+2", 7, 1)
         self.assertEqual(len(sn), 7)
-        self.assertEqual(sn, [1, 3, 4, 5, 9, 10, 11])
+        self.assertEqual(sn, ['1', '3', '4', '5', '9', '10', '11'])
 
         sn = e("1,3-5,9+2", 7, 1)
         self.assertEqual(len(sn), 7)
-        self.assertEqual(sn, [1, 3, 4, 5, 9, 10, 11])
+        self.assertEqual(sn, ['1', '3', '4', '5', '9', '10', '11'])
 
-        sn = e("~+2", 3, 14)
+        sn = e("~+2", 3, 13)
         self.assertEqual(len(sn), 3)
-        self.assertEqual(sn, [14, 15, 16])
+        self.assertEqual(sn, ['14', '15', '16'])
 
-        sn = e("~+", 2, 14)
+        sn = e("~+", 2, 13)
         self.assertEqual(len(sn), 2)
-        self.assertEqual(sn, [14, 15])
+        self.assertEqual(sn, ['14', '15'])
 
 
 class TestVersionNumber(TestCase):

InvenTree/InvenTree/validators.py

@@ -47,16 +47,40 @@ class AllowedURLValidator(validators.URLValidator):
 
 
 def validate_part_name(value):
-    """Prevent some illegal characters in part names."""
+    """Validate the name field for a Part instance
-    for c in ['|', '#', '$', '{', '}']:
+
-        if c in str(value):
+    This function is exposed to any Validation plugins, and thus can be customized.
-            raise ValidationError(
+    """
-                _('Invalid character in part name')
+
-            )
+    from plugin.registry import registry
+
+    for plugin in registry.with_mixin('validation'):
+        # Run the name through each custom validator
+        # If the plugin returns 'True' we will skip any subsequent validation
+        if plugin.validate_part_name(value):
+            return
 
 
 def validate_part_ipn(value):
-    """Validate the Part IPN against regex rule."""
+    """Validate the IPN field for a Part instance.
+
+    This function is exposed to any Validation plugins, and thus can be customized.
+
+    If no validation errors are raised, the IPN is also validated against a configurable regex pattern.
+    """
+
+    from plugin.registry import registry
+
+    plugins = registry.with_mixin('validation')
+
+    for plugin in plugins:
+        # Run the IPN through each custom validator
+        # If the plugin returns 'True' we will skip any subsequent validation
+        if plugin.validate_part_ipn(value):
+            return
+
+    # If we get to here, none of the plugins have raised an error
+
     pattern = common.models.InvenTreeSetting.get_setting('PART_IPN_REGEX')
 
     if pattern:
@@ -68,28 +92,25 @@ def validate_part_ipn(value):
 
 def validate_purchase_order_reference(value):
     """Validate the 'reference' field of a PurchaseOrder."""
-    pattern = common.models.InvenTreeSetting.get_setting('PURCHASEORDER_REFERENCE_REGEX')
 
-    if pattern:
+    from order.models import PurchaseOrder
-        match = re.search(pattern, value)
 
-        if match is None:
+    # If we get to here, run the "default" validation routine
-            raise ValidationError(_('Reference must match pattern {pattern}').format(pattern=pattern))
+    PurchaseOrder.validate_reference_field(value)
 
 
 def validate_sales_order_reference(value):
     """Validate the 'reference' field of a SalesOrder."""
-    pattern = common.models.InvenTreeSetting.get_setting('SALESORDER_REFERENCE_REGEX')
 
-    if pattern:
+    from order.models import SalesOrder
-        match = re.search(pattern, value)
 
-        if match is None:
+    # If we get to here, run the "default" validation routine
-            raise ValidationError(_('Reference must match pattern {pattern}').format(pattern=pattern))
+    SalesOrder.validate_reference_field(value)
 
 
 def validate_tree_name(value):
     """Placeholder for legacy function used in migrations."""
+    ...
 
 
 def validate_overage(value):

InvenTree/build/serializers.py

@@ -14,7 +14,6 @@ from InvenTree.serializers import InvenTreeModelSerializer, InvenTreeAttachmentS
 from InvenTree.serializers import UserSerializer
 
 import InvenTree.helpers
-from InvenTree.helpers import extract_serial_numbers
 from InvenTree.serializers import InvenTreeDecimalField
 from InvenTree.status_codes import StockStatus
 
@@ -260,7 +259,11 @@ class BuildOutputCreateSerializer(serializers.Serializer):
         if serial_numbers:
 
             try:
-                self.serials = extract_serial_numbers(serial_numbers, quantity, part.getLatestSerialNumberInt())
+                self.serials = InvenTree.helpers.extract_serial_numbers(
+                    serial_numbers,
+                    quantity,
+                    part.get_latest_serial_number()
+                )
             except DjangoValidationError as e:
                 raise ValidationError({
                     'serial_numbers': e.messages,
@@ -270,12 +273,12 @@ class BuildOutputCreateSerializer(serializers.Serializer):
             existing = []
 
             for serial in self.serials:
-                if part.checkIfSerialNumberExists(serial):
+                if not part.validate_serial_number(serial):
                     existing.append(serial)
 
             if len(existing) > 0:
 
-                msg = _("The following serial numbers already exist")
+                msg = _("The following serial numbers already exist or are invalid")
                 msg += " : "
                 msg += ",".join([str(e) for e in existing])
 

InvenTree/build/test_api.py

@@ -389,7 +389,7 @@ class BuildTest(BuildAPITest):
             expected_code=400,
         )
 
-        self.assertIn('The following serial numbers already exist : 1,2,3', str(response.data))
+        self.assertIn('The following serial numbers already exist or are invalid : 1,2,3', str(response.data))
 
         # Double check no new outputs have been created
         self.assertEqual(n_outputs + 5, bo.output_count)

InvenTree/build/validators.py

@@ -18,8 +18,9 @@ def validate_build_order_reference_pattern(pattern):
 
 
 def validate_build_order_reference(value):
-    """Validate that the BuildOrder reference field matches the required pattern"""
+    """Validate that the BuildOrder reference field matches the required pattern."""
 
     from build.models import Build
 
+    # If we get to here, run the "default" validation routine
     Build.validate_reference_field(value)

InvenTree/common/models.py

@@ -1139,6 +1139,13 @@ class InvenTreeSetting(BaseInvenTreeSetting):
             'validator': bool,
         },
 
+        'SERIAL_NUMBER_GLOBALLY_UNIQUE': {
+            'name': _('Globally Unique Serials'),
+            'description': _('Serial numbers for stock items must be globally unique'),
+            'default': False,
+            'validator': bool,
+        },
+
         'STOCK_BATCH_CODE_TEMPLATE': {
             'name': _('Batch Code Template'),
             'description': _('Template for generating default batch codes for stock items'),

InvenTree/order/serializers.py

@@ -531,7 +531,11 @@ class PurchaseOrderLineItemReceiveSerializer(serializers.Serializer):
         if serial_numbers:
             try:
                 # Pass the serial numbers through to the parent serializer once validated
-                data['serials'] = extract_serial_numbers(serial_numbers, pack_quantity, base_part.getLatestSerialNumberInt())
+                data['serials'] = extract_serial_numbers(
+                    serial_numbers,
+                    pack_quantity,
+                    base_part.get_latest_serial_number()
+                )
             except DjangoValidationError as e:
                 raise ValidationError({
                     'serial_numbers': e.messages,
@@ -1256,7 +1260,11 @@ class SalesOrderSerialAllocationSerializer(serializers.Serializer):
         part = line_item.part
 
         try:
-            data['serials'] = extract_serial_numbers(serial_numbers, quantity, part.getLatestSerialNumberInt())
+            data['serials'] = extract_serial_numbers(
+                serial_numbers,
+                quantity,
+                part.get_latest_serial_number()
+            )
         except DjangoValidationError as e:
             raise ValidationError({
                 'serial_numbers': e.messages,

InvenTree/part/api.py

@@ -25,8 +25,8 @@ from company.models import Company, ManufacturerPart, SupplierPart
 from InvenTree.api import (APIDownloadMixin, AttachmentMixin,
                            ListCreateDestroyAPIView)
 from InvenTree.filters import InvenTreeOrderingFilter
-from InvenTree.helpers import (DownloadFile, increment, isNull, str2bool,
+from InvenTree.helpers import (DownloadFile, increment_serial_number, isNull,
-                               str2int)
+                               str2bool, str2int)
 from InvenTree.mixins import (CreateAPI, ListAPI, ListCreateAPI, RetrieveAPI,
                               RetrieveUpdateAPI, RetrieveUpdateDestroyAPI,
                               UpdateAPI)
@@ -717,16 +717,16 @@ class PartSerialNumberDetail(RetrieveAPI):
         part = self.get_object()
 
         # Calculate the "latest" serial number
-        latest = part.getLatestSerialNumber()
+        latest = part.get_latest_serial_number()
 
         data = {
             'latest': latest,
         }
 
         if latest is not None:
-            next_serial = increment(latest)
+            next_serial = increment_serial_number(latest)
 
-            if next_serial != increment:
+            if next_serial != latest:
                 data['next'] = next_serial
 
         return Response(data)

InvenTree/part/models.py

@@ -529,112 +529,126 @@ class Part(InvenTreeBarcodeMixin, MetadataMixin, MPTTModel):
 
         return result
 
-    def checkIfSerialNumberExists(self, sn, exclude_self=False):
+    def validate_serial_number(self, serial: str, stock_item=None, check_duplicates=True, raise_error=False):
-        """Check if a serial number exists for this Part.
+        """Validate a serial number against this Part instance.
 
-        Note: Serial numbers must be unique across an entire Part "tree", so here we filter by the entire tree.
+        Note: This function is exposed to any Validation plugins, and thus can be customized.
+
+        Any plugins which implement the 'validate_serial_number' method have three possible outcomes:
+
+        - Decide the serial is objectionable and raise a django.core.exceptions.ValidationError
+        - Decide the serial is acceptable, and return None to proceed to other tests
+        - Decide the serial is acceptable, and return True to skip any further tests
+
+        Arguments:
+            serial: The proposed serial number
+            stock_item: (optional) A StockItem instance which has this serial number assigned (e.g. testing for duplicates)
+            raise_error: If False, and ValidationError(s) will be handled
+
+        Returns:
+            True if serial number is 'valid' else False
+
+        Raises:
+            ValidationError if serial number is invalid and raise_error = True
         """
-        parts = Part.objects.filter(tree_id=self.tree_id)
 
-        stock = StockModels.StockItem.objects.filter(part__in=parts, serial=sn)
+        serial = str(serial).strip()
 
-        if exclude_self:
+        # First, throw the serial number against each of the loaded validation plugins
-            stock = stock.exclude(pk=self.pk)
+        from plugin.registry import registry
 
-        return stock.exists()
+        try:
+            for plugin in registry.with_mixin('validation'):
+                # Run the serial number through each custom validator
+                # If the plugin returns 'True' we will skip any subsequent validation
+                if plugin.validate_serial_number(serial):
+                    return True
+        except ValidationError as exc:
+            if raise_error:
+                # Re-throw the error
+                raise exc
+            else:
+                return False
 
-    def find_conflicting_serial_numbers(self, serials):
+        """
+        If we are here, none of the loaded plugins (if any) threw an error or exited early
+
+        Now, we run the "default" serial number validation routine,
+        which checks that the serial number is not duplicated
+        """
+
+        if not check_duplicates:
+            return
+
+        from part.models import Part
+        from stock.models import StockItem
+
+        if common.models.InvenTreeSetting.get_setting('SERIAL_NUMBER_GLOBALLY_UNIQUE', False):
+            # Serial number must be unique across *all* parts
+            parts = Part.objects.all()
+        else:
+            # Serial number must only be unique across this part "tree"
+            parts = Part.objects.filter(tree_id=self.tree_id)
+
+        stock = StockItem.objects.filter(part__in=parts, serial=serial)
+
+        if stock_item:
+            # Exclude existing StockItem from query
+            stock = stock.exclude(pk=stock_item.pk)
+
+        if stock.exists():
+            if raise_error:
+                raise ValidationError(_("Stock item with this serial number already exists") + ": " + serial)
+            else:
+                return False
+        else:
+            # This serial number is perfectly valid
+            return True
+
+    def find_conflicting_serial_numbers(self, serials: list):
         """For a provided list of serials, return a list of those which are conflicting."""
+
         conflicts = []
 
         for serial in serials:
-            if self.checkIfSerialNumberExists(serial, exclude_self=True):
+            if not self.validate_serial_number(serial):
                 conflicts.append(serial)
 
         return conflicts
 
-    def getLatestSerialNumber(self):
+    def get_latest_serial_number(self):
-        """Return the "latest" serial number for this Part.
+        """Find the 'latest' serial number for this Part.
 
-        If *all* the serial numbers are integers, then this will return the highest one.
+        Here we attempt to find the "highest" serial number which exists for this Part.
-        Otherwise, it will simply return the serial number most recently added.
+        There are a number of edge cases where this method can fail,
+        but this is accepted to keep database performance at a reasonable level.
 
         Note: Serial numbers must be unique across an entire Part "tree",
         so we filter by the entire tree.
-        """
-        parts = Part.objects.filter(tree_id=self.tree_id)
-        stock = StockModels.StockItem.objects.filter(part__in=parts).exclude(serial=None)
 
-        # There are no matchin StockItem objects (skip further tests)
+        Returns:
+            The latest serial number specified for this part, or None
+        """
+
+        stock = StockModels.StockItem.objects.all().exclude(serial=None).exclude(serial='')
+
+        # Generate a query for any stock items for this part variant tree with non-empty serial numbers
+        if common.models.InvenTreeSetting.get_setting('SERIAL_NUMBER_GLOBALLY_UNIQUE', False):
+            # Serial numbers are unique across all parts
+            pass
+        else:
+            # Serial numbers are unique acros part trees
+            stock = stock.filter(part__tree_id=self.tree_id)
+
+        # There are no matching StockItem objects (skip further tests)
         if not stock.exists():
             return None
 
-        # Attempt to coerce the returned serial numbers to integers
+        # Sort in descending order
-        # If *any* are not integers, fail!
+        stock = stock.order_by('-serial_int', '-serial', '-pk')
-        try:
-            ordered = sorted(stock.all(), reverse=True, key=lambda n: int(n.serial))
 
-            if len(ordered) > 0:
+        # Return the first serial value
-                return ordered[0].serial
+        return stock[0].serial
-
-        # One or more of the serial numbers was non-numeric
-        # In this case, the "best" we can do is return the most recent
-        except ValueError:
-            return stock.last().serial
-
-        # No serial numbers found
-        return None
-
-    def getLatestSerialNumberInt(self):
-        """Return the "latest" serial number for this Part as a integer.
-
-        If it is not an integer the result is 0
-        """
-        latest = self.getLatestSerialNumber()
-
-        # No serial number = > 0
-        if latest is None:
-            latest = 0
-
-        # Attempt to turn into an integer and return
-        try:
-            latest = int(latest)
-            return latest
-        except Exception:
-            # not an integer so 0
-            return 0
-
-    def getSerialNumberString(self, quantity=1):
-        """Return a formatted string representing the next available serial numbers, given a certain quantity of items."""
-        latest = self.getLatestSerialNumber()
-
-        quantity = int(quantity)
-
-        # No serial numbers can be found, assume 1 as the first serial
-        if latest is None:
-            latest = 0
-
-        # Attempt to turn into an integer
-        try:
-            latest = int(latest)
-        except Exception:
-            pass
-
-        if type(latest) is int:
-
-            if quantity >= 2:
-                text = '{n} - {m}'.format(n=latest + 1, m=latest + 1 + quantity)
-
-                return _('Next available serial numbers are') + ' ' + text
-            else:
-                text = str(latest + 1)
-
-                return _('Next available serial number is') + ' ' + text
-
-        else:
-            # Non-integer values, no option but to return latest
-
-            return _('Most recent serial number is') + ' ' + str(latest)
 
     @property
     def full_name(self):

InvenTree/part/templates/part/part_base.html

@@ -323,12 +323,13 @@
                         {% endif %}
                     </td>
                 </tr>
-                {% if part.trackable and part.getLatestSerialNumber %}
+                {% with part.get_latest_serial_number as sn %}
+                {% if part.trackable and sn %}
                 <tr>
                     <td><span class='fas fa-hashtag'></span></td>
                     <td>{% trans "Latest Serial Number" %}</td>
                     <td>
-                        {{ part.getLatestSerialNumber }}
+                        {{ sn }}
                         <div class='btn-group float-right' role='group'>
                             <a class='btn btn-small btn-outline-secondary text-sm' href='#' id='serial-number-search' title='{% trans "Search for serial number" %}'>
                                 <span class='fas fa-search'></span>
@@ -337,6 +338,7 @@
                     </td>
                 </tr>
                 {% endif %}
+                {% endwith %}
                 {% if part.default_location %}
                 <tr>
                     <td><span class='fas fa-search-location'></span></td>

InvenTree/plugin/base/integration/mixins.py

@@ -214,6 +214,139 @@ class ScheduleMixin:
             logger.warning("unregister_tasks failed, database not ready")
 
 
+class ValidationMixin:
+    """Mixin class that allows custom validation for various parts of InvenTree
+
+    Custom generation and validation functionality can be provided for:
+
+    - Part names
+    - Part IPN (internal part number) values
+    - Serial numbers
+    - Batch codes
+
+    Notes:
+    - Multiple ValidationMixin plugins can be used simultaneously
+    - The stub methods provided here generally return None (null value).
+    - The "first" plugin to return a non-null value for a particular method "wins"
+    - In the case of "validation" functions, all loaded plugins are checked until an exception is thrown
+
+    Implementing plugins may override any of the following methods which are of interest.
+
+    For 'validation' methods, there are three 'acceptable' outcomes:
+    - The method determines that the value is 'invalid' and raises a django.core.exceptions.ValidationError
+    - The method passes and returns None (the code then moves on to the next plugin)
+    - The method passes and returns True (and no subsequent plugins are checked)
+
+    """
+
+    class MixinMeta:
+        """Metaclass for this mixin"""
+        MIXIN_NAME = "Validation"
+
+    def __init__(self):
+        """Register the mixin"""
+        super().__init__()
+        self.add_mixin('validation', True, __class__)
+
+    def validate_part_name(self, name: str):
+        """Perform validation on a proposed Part name
+
+        Arguments:
+            name: The proposed part name
+
+        Returns:
+            None or True
+
+        Raises:
+            ValidationError if the proposed name is objectionable
+        """
+        return None
+
+    def validate_part_ipn(self, ipn: str):
+        """Perform validation on a proposed Part IPN (internal part number)
+
+        Arguments:
+            ipn: The proposed part IPN
+
+        Returns:
+            None or True
+
+        Raises:
+            ValidationError if the proposed IPN is objectionable
+        """
+        return None
+
+    def validate_batch_code(self, batch_code: str):
+        """Validate the supplied batch code
+
+        Arguments:
+            batch_code: The proposed batch code (string)
+
+        Returns:
+            None or True
+
+        Raises:
+            ValidationError if the proposed batch code is objectionable
+        """
+        return None
+
+    def generate_batch_code(self):
+        """Generate a new batch code
+
+        Returns:
+            A new batch code (string) or None
+        """
+        return None
+
+    def validate_serial_number(self, serial: str):
+        """Validate the supplied serial number
+
+        Arguments:
+            serial: The proposed serial number (string)
+
+        Returns:
+            None or True
+
+        Raises:
+            ValidationError if the proposed serial is objectionable
+        """
+        return None
+
+    def convert_serial_to_int(self, serial: str):
+        """Convert a serial number (string) into an integer representation.
+
+        This integer value is used for efficient sorting based on serial numbers.
+
+        A plugin which implements this method can either return:
+
+        - An integer based on the serial string, according to some algorithm
+        - A fixed value, such that serial number sorting reverts to the string representation
+        - None (null value) to let any other plugins perform the converrsion
+
+        Note that there is no requirement for the returned integer value to be unique.
+
+        Arguments:
+            serial: Serial value (string)
+
+        Returns:
+            integer representation of the serial number, or None
+        """
+        return None
+
+    def increment_serial_number(self, serial: str):
+        """Return the next sequential serial based on the provided value.
+
+        A plugin which implements this method can either return:
+
+        - A string which represents the "next" serial number in the sequence
+        - None (null value) if the next value could not be determined
+
+        Arguments:
+            serial: Current serial value (string)
+        """
+        return None
+
+
 class UrlsMixin:
     """Mixin that enables custom URLs for the plugin."""
 

InvenTree/plugin/mixins/__init__.py

@@ -8,7 +8,8 @@ from ..base.barcodes.mixins import BarcodeMixin
 from ..base.event.mixins import EventMixin
 from ..base.integration.mixins import (APICallMixin, AppMixin, NavigationMixin,
                                        PanelMixin, ScheduleMixin,
-                                       SettingsMixin, UrlsMixin)
+                                       SettingsMixin, UrlsMixin,
+                                       ValidationMixin)
 from ..base.label.mixins import LabelPrintingMixin
 from ..base.locate.mixins import LocateMixin
 
@@ -25,6 +26,7 @@ __all__ = [
     'ActionMixin',
     'BarcodeMixin',
     'LocateMixin',
+    'ValidationMixin',
     'SingleNotificationMethod',
     'BulkNotificationMethod',
 ]

InvenTree/plugin/registry.py

@@ -398,6 +398,7 @@ class PluginsRegistry:
                 plg_db = None
             except (IntegrityError) as error:  # pragma: no cover
                 logger.error(f"Error initializing plugin `{plg_name}`: {error}")
+                handle_error(error, log_name='init')
 
             # Append reference to plugin
             plg.db = plg_db

InvenTree/plugin/samples/integration/validation_sample.py

@@ -0,0 +1,79 @@
+"""Sample plugin which demonstrates custom validation functionality"""
+
+from datetime import datetime
+
+from django.core.exceptions import ValidationError
+
+from plugin import InvenTreePlugin
+from plugin.mixins import SettingsMixin, ValidationMixin
+
+
+class CustomValidationMixin(SettingsMixin, ValidationMixin, InvenTreePlugin):
+    """A sample plugin class for demonstrating custom validation functions"""
+
+    NAME = "CustomValidator"
+    SLUG = "validator"
+    TITLE = "Custom Validator Plugin"
+    DESCRIPTION = "A sample plugin for demonstrating custom validation functionality"
+    VERSION = "0.1"
+
+    SETTINGS = {
+        'ILLEGAL_PART_CHARS': {
+            'name': 'Illegal Part Characters',
+            'description': 'Characters which are not allowed to appear in Part names',
+            'default': '!@#$%^&*()~`'
+        },
+        'IPN_MUST_CONTAIN_Q': {
+            'name': 'IPN Q Requirement',
+            'description': 'Part IPN field must contain the character Q',
+            'default': False,
+            'validator': bool,
+        },
+        'SERIAL_MUST_BE_PALINDROME': {
+            'name': 'Palindromic Serials',
+            'description': 'Serial numbers must be palindromic',
+            'default': False,
+            'validator': bool,
+        },
+        'BATCH_CODE_PREFIX': {
+            'name': 'Batch prefix',
+            'description': 'Required prefix for batch code',
+            'default': '',
+        }
+    }
+
+    def validate_part_name(self, name: str):
+        """Validate part name"""
+
+        illegal_chars = self.get_setting('ILLEGAL_PART_CHARS')
+
+        for c in illegal_chars:
+            if c in name:
+                raise ValidationError(f"Illegal character in part name: '{c}'")
+
+    def validate_part_ipn(self, ipn: str):
+        """Validate part IPN"""
+
+        if self.get_setting('IPN_MUST_CONTAIN_Q') and 'Q' not in ipn:
+            raise ValidationError("IPN must contain 'Q'")
+
+    def validate_serial_number(self, serial: str):
+        """Validate serial number for a given StockItem"""
+
+        if self.get_setting('SERIAL_MUST_BE_PALINDROME'):
+            if serial != serial[::-1]:
+                raise ValidationError("Serial must be a palindrome")
+
+    def validate_batch_code(self, batch_code: str):
+        """Ensure that a particular batch code meets specification"""
+
+        prefix = self.get_setting('BATCH_CODE_PREFIX')
+
+        if not batch_code.startswith(prefix):
+            raise ValidationError(f"Batch code must start with '{prefix}'")
+
+    def generate_batch_code(self):
+        """Generate a new batch code."""
+
+        now = datetime.now()
+        return f"BATCH-{now.year}:{now.month}:{now.day}"

InvenTree/stock/api.py

@@ -563,23 +563,35 @@ class StockList(APIDownloadMixin, ListCreateDestroyAPIView):
 
             # If serial numbers are specified, check that they match!
             try:
-                serials = extract_serial_numbers(serial_numbers, quantity, part.getLatestSerialNumberInt())
+                serials = extract_serial_numbers(
+                    serial_numbers,
+                    quantity,
+                    part.get_latest_serial_number()
+                )
 
-                # Determine if any of the specified serial numbers already exist!
+                # Determine if any of the specified serial numbers are invalid
-                existing = []
+                # Note "invalid" means either they already exist, or do not pass custom rules
+                invalid = []
+                errors = []
 
                 for serial in serials:
-                    if part.checkIfSerialNumberExists(serial):
+                    try:
-                        existing.append(serial)
+                        part.validate_serial_number(serial, raise_error=True)
+                    except DjangoValidationError as exc:
+                        # Catch raised error to extract specific error information
+                        invalid.append(serial)
 
-                if len(existing) > 0:
+                        if exc.message not in errors:
+                            errors.append(exc.message)
 
-                    msg = _("The following serial numbers already exist")
+                if len(errors) > 0:
+
+                    msg = _("The following serial numbers already exist or are invalid")
                     msg += " : "
-                    msg += ",".join([str(e) for e in existing])
+                    msg += ",".join([str(e) for e in invalid])
 
                     raise ValidationError({
-                        'serial_numbers': [msg],
+                        'serial_numbers': errors + [msg]
                     })
 
             except DjangoValidationError as e:

InvenTree/stock/fixtures/stock.yaml

@@ -96,6 +96,7 @@
     location: 7
     quantity: 1
     serial: 1000
+    serial_int: 1000
     level: 0
     tree_id: 0
     lft: 0
@@ -121,6 +122,7 @@
     location: 7
     quantity: 1
     serial: 1
+    serial_int: 1
     level: 0
     tree_id: 0
     lft: 0
@@ -133,6 +135,7 @@
     location: 7
     quantity: 1
     serial: 2
+    serial_int: 2
     level: 0
     tree_id: 0
     lft: 0
@@ -145,6 +148,7 @@
     location: 7
     quantity: 1
     serial: 3
+    serial_int: 3
     level: 0
     tree_id: 0
     lft: 0
@@ -157,6 +161,7 @@
     location: 7
     quantity: 1
     serial: 4
+    serial_int: 4
     level: 0
     tree_id: 0
     lft: 0
@@ -169,6 +174,7 @@
     location: 7
     quantity: 1
     serial: 5
+    serial_int: 5
     level: 0
     tree_id: 0
     lft: 0
@@ -181,6 +187,7 @@
     location: 7
     quantity: 1
     serial: 10
+    serial_int: 10
     level: 0
     tree_id: 0
     lft: 0
@@ -193,6 +200,7 @@
     location: 7
     quantity: 1
     serial: 11
+    serial_int: 11
     level: 0
     tree_id: 0
     lft: 0
@@ -205,6 +213,7 @@
     location: 7
     quantity: 1
     serial: 12
+    serial_int: 12
     level: 0
     tree_id: 0
     lft: 0
@@ -217,6 +226,7 @@
     location: 7
     quantity: 1
     serial: 20
+    serial_int: 20
     level: 0
     tree_id: 0
     lft: 0
@@ -231,6 +241,7 @@
     location: 7
     quantity: 1
     serial: 21
+    serial_int: 21
     level: 0
     tree_id: 0
     lft: 0
@@ -245,6 +256,7 @@
     location: 7
     quantity: 1
     serial: 22
+    serial_int: 22
     level: 0
     tree_id: 0
     lft: 0

InvenTree/stock/models.py

@@ -180,9 +180,24 @@ class StockItemManager(TreeManager):
 def generate_batch_code():
     """Generate a default 'batch code' for a new StockItem.
 
-    This uses the value of the 'STOCK_BATCH_CODE_TEMPLATE' setting (if configured),
+    By default, this uses the value of the 'STOCK_BATCH_CODE_TEMPLATE' setting (if configured),
     which can be passed through a simple template.
+
+    Also, this function is exposed to the ValidationMixin plugin class,
+    allowing custom plugins to be used to generate new batch code values
     """
+
+    # First, check if any plugins can generate batch codes
+    from plugin.registry import registry
+
+    for plugin in registry.with_mixin('validation'):
+        batch = plugin.generate_batch_code()
+
+        if batch is not None:
+            # Return the first non-null value generated by a plugin
+            return batch
+
+    # If we get to this point, no plugin was able to generate a new batch code
     batch_template = common.models.InvenTreeSetting.get_setting('STOCK_BATCH_CODE_TEMPLATE', '')
 
     now = datetime.now()
@@ -260,15 +275,38 @@ class StockItem(InvenTreeBarcodeMixin, MetadataMixin, MPTTModel):
 
         This is used for efficient numerical sorting
         """
-        serial = getattr(self, 'serial', '')
+
+        serial = str(getattr(self, 'serial', '')).strip()
+
+        from plugin.registry import registry
+
+        # First, let any plugins convert this serial number to an integer value
+        # If a non-null value is returned (by any plugin) we will use that
+
+        serial_int = None
+
+        for plugin in registry.with_mixin('validation'):
+            serial_int = plugin.convert_serial_to_int(serial)
+
+            if serial_int is not None:
+                # Save the first returned result
+                # Ensure that it is clipped within a range allowed in the database schema
+                clip = 0x7fffffff
+
+                serial_int = abs(serial_int)
+
+                if serial_int > clip:
+                    serial_int = clip
+
+                self.serial_int = serial_int
+                return
+
+        # If we get to this point, none of the available plugins provided an integer value
 
         # Default value if we cannot convert to an integer
         serial_int = 0
 
-        if serial is not None:
+        if serial not in [None, '']:
-
-            serial = str(serial).strip()
-
             serial_int = extract_int(serial)
 
         self.serial_int = serial_int
@@ -408,16 +446,32 @@ class StockItem(InvenTreeBarcodeMixin, MetadataMixin, MPTTModel):
 
         # If the serial number is set, make sure it is not a duplicate
         if self.serial:
-            # Query to look for duplicate serial numbers
-            parts = PartModels.Part.objects.filter(tree_id=self.part.tree_id)
-            stock = StockItem.objects.filter(part__in=parts, serial=self.serial)
 
-            # Exclude myself from the search
+            self.serial = str(self.serial).strip()
-            if self.pk is not None:
-                stock = stock.exclude(pk=self.pk)
 
-            if stock.exists():
+            try:
-                raise ValidationError({"serial": _("StockItem with this serial number already exists")})
+                self.part.validate_serial_number(self.serial, self, raise_error=True)
+            except ValidationError as exc:
+                raise ValidationError({
+                    'serial': exc.message,
+                })
+
+    def validate_batch_code(self):
+        """Ensure that the batch code is valid for this StockItem.
+
+        - Validation is performed by custom plugins.
+        - By default, no validation checks are performed
+        """
+
+        from plugin.registry import registry
+
+        for plugin in registry.with_mixin('validation'):
+            try:
+                plugin.validate_batch_code(self.batch)
+            except ValidationError as exc:
+                raise ValidationError({
+                    'batch': exc.message
+                })
 
     def clean(self):
         """Validate the StockItem object (separate to field validation).
@@ -438,6 +492,8 @@ class StockItem(InvenTreeBarcodeMixin, MetadataMixin, MPTTModel):
         if type(self.batch) is str:
             self.batch = self.batch.strip()
 
+        self.validate_batch_code()
+
         try:
             # Trackable parts must have integer values for quantity field!
             if self.part.trackable:

InvenTree/stock/serializers.py

@@ -342,7 +342,11 @@ class SerializeStockItemSerializer(serializers.Serializer):
         serial_numbers = data['serial_numbers']
 
         try:
-            serials = InvenTree.helpers.extract_serial_numbers(serial_numbers, quantity, item.part.getLatestSerialNumberInt())
+            serials = InvenTree.helpers.extract_serial_numbers(
+                serial_numbers,
+                quantity,
+                item.part.get_latest_serial_number()
+            )
         except DjangoValidationError as e:
             raise ValidationError({
                 'serial_numbers': e.messages,
@@ -371,7 +375,7 @@ class SerializeStockItemSerializer(serializers.Serializer):
         serials = InvenTree.helpers.extract_serial_numbers(
             data['serial_numbers'],
             data['quantity'],
-            item.part.getLatestSerialNumberInt()
+            item.part.get_latest_serial_number()
         )
 
         item.serializeStock(

InvenTree/stock/test_api.py

@@ -495,7 +495,7 @@ class StockItemTest(StockAPITestCase):
 
         # Check that each serial number was created
         for i in range(1, 11):
-            self.assertTrue(i in sn)
+            self.assertTrue(str(i) in sn)
 
             # Check the unique stock item has been created
 

InvenTree/stock/tests.py

@@ -7,6 +7,7 @@ from django.db.models import Sum
 from django.test import override_settings
 
 from build.models import Build
+from common.models import InvenTreeSetting
 from InvenTree.helpers import InvenTreeTestCase
 from InvenTree.status_codes import StockHistoryCode
 from part.models import Part
@@ -172,6 +173,39 @@ class StockTest(StockTestBase):
         item.save()
         item.full_clean()
 
+    def test_serial_numbers(self):
+        """Test serial number uniqueness"""
+
+        # Ensure that 'global uniqueness' setting is enabled
+        InvenTreeSetting.set_setting('SERIAL_NUMBER_GLOBALLY_UNIQUE', True, self.user)
+
+        part_a = Part.objects.create(name='A', description='A', trackable=True)
+        part_b = Part.objects.create(name='B', description='B', trackable=True)
+
+        # Create a StockItem for part_a
+        StockItem.objects.create(
+            part=part_a,
+            quantity=1,
+            serial='ABCDE',
+        )
+
+        # Create a StockItem for part_a (but, will error due to identical serial)
+        with self.assertRaises(ValidationError):
+            StockItem.objects.create(
+                part=part_b,
+                quantity=1,
+                serial='ABCDE',
+            )
+
+        # Now, allow serial numbers to be duplicated between different parts
+        InvenTreeSetting.set_setting('SERIAL_NUMBER_GLOBALLY_UNIQUE', False, self.user)
+
+        StockItem.objects.create(
+            part=part_b,
+            quantity=1,
+            serial='ABCDE',
+        )
+
     def test_expiry(self):
         """Test expiry date functionality for StockItem model."""
         today = datetime.datetime.now().date()
@@ -857,22 +891,21 @@ class VariantTest(StockTestBase):
 
     def test_serial_numbers(self):
         """Test serial number functionality for variant / template parts."""
+
+        InvenTreeSetting.set_setting('SERIAL_NUMBER_GLOBALLY_UNIQUE', False, self.user)
+
         chair = Part.objects.get(pk=10000)
 
         # Operations on the top-level object
-        self.assertTrue(chair.checkIfSerialNumberExists(1))
+        [self.assertFalse(chair.validate_serial_number(i)) for i in [1, 2, 3, 4, 5, 20, 21, 22]]
-        self.assertTrue(chair.checkIfSerialNumberExists(2))
-        self.assertTrue(chair.checkIfSerialNumberExists(3))
-        self.assertTrue(chair.checkIfSerialNumberExists(4))
-        self.assertTrue(chair.checkIfSerialNumberExists(5))
 
-        self.assertTrue(chair.checkIfSerialNumberExists(20))
+        self.assertFalse(chair.validate_serial_number(20))
-        self.assertTrue(chair.checkIfSerialNumberExists(21))
+        self.assertFalse(chair.validate_serial_number(21))
-        self.assertTrue(chair.checkIfSerialNumberExists(22))
+        self.assertFalse(chair.validate_serial_number(22))
 
-        self.assertFalse(chair.checkIfSerialNumberExists(30))
+        self.assertTrue(chair.validate_serial_number(30))
 
-        self.assertEqual(chair.getLatestSerialNumber(), '22')
+        self.assertEqual(chair.get_latest_serial_number(), '22')
 
         # Check for conflicting serial numbers
         to_check = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
@@ -883,10 +916,10 @@ class VariantTest(StockTestBase):
 
         # Same operations on a sub-item
         variant = Part.objects.get(pk=10003)
-        self.assertEqual(variant.getLatestSerialNumber(), '22')
+        self.assertEqual(variant.get_latest_serial_number(), '22')
 
         # Create a new serial number
-        n = variant.getLatestSerialNumber()
+        n = variant.get_latest_serial_number()
 
         item = StockItem(
             part=variant,
@@ -898,12 +931,6 @@ class VariantTest(StockTestBase):
         with self.assertRaises(ValidationError):
             item.save()
 
-        # Verify items with a non-numeric serial don't offer a next serial.
-        item.serial = "string"
-        item.save()
-
-        self.assertEqual(variant.getLatestSerialNumber(), "string")
-
         # This should pass, although not strictly an int field now.
         item.serial = int(n) + 1
         item.save()
@@ -915,7 +942,7 @@ class VariantTest(StockTestBase):
         with self.assertRaises(ValidationError):
             item.save()
 
-        item.serial += 1
+        item.serial = int(n) + 2
         item.save()
 
 

InvenTree/templates/InvenTree/settings/stock.html

@@ -11,6 +11,7 @@
 
 <table class='table table-striped table-condensed'>
     <tbody>
+        {% include "InvenTree/settings/setting.html" with key="SERIAL_NUMBER_GLOBALLY_UNIQUE" icon="fa-hashtag" %}
         {% include "InvenTree/settings/setting.html" with key="STOCK_BATCH_CODE_TEMPLATE" icon="fa-layer-group" %}
         {% include "InvenTree/settings/setting.html" with key="STOCK_ENABLE_EXPIRY" icon="fa-stopwatch" %}
         {% include "InvenTree/settings/setting.html" with key="STOCK_STALE_DAYS" icon="fa-calendar" %}

InvenTree/templates/js/translated/forms.js

@@ -1230,12 +1230,7 @@ function handleNestedErrors(errors, field_name, options={}) {
             // Find the target (nested) field
             var target = `${field_name}_${sub_field_name}_${nest_id}`;
 
-            for (var ii = errors.length-1; ii >= 0; ii--) {
+            addFieldErrorMessage(target, errors, options);
-
-                var error_text = errors[ii];
-
-                addFieldErrorMessage(target, error_text, ii, options);
-            }
         }
     }
 }
@@ -1312,13 +1307,7 @@ function handleFormErrors(errors, fields={}, options={}) {
                 first_error_field = field_name;
             }
 
-            // Add an entry for each returned error message
+            addFieldErrorMessage(field_name, field_errors, options);
-            for (var ii = field_errors.length-1; ii >= 0; ii--) {
-
-                var error_text = field_errors[ii];
-
-                addFieldErrorMessage(field_name, error_text, ii, options);
-            }
         }
     }
 
@@ -1341,6 +1330,16 @@ function handleFormErrors(errors, fields={}, options={}) {
  */
 function addFieldErrorMessage(name, error_text, error_idx=0, options={}) {
 
+    // Handle a 'list' of error message recursively
+    if (typeof(error_text) == 'object') {
+        // Iterate backwards through the list
+        for (var ii = error_text.length - 1; ii >= 0; ii--) {
+            addFieldErrorMessage(name, error_text[ii], ii, options);
+        }
+
+        return;
+    }
+
     field_name = getFieldName(name, options);
 
     var field_dom = null;