Reference fields (#3267)

* Adds a configurable 'reference pattern' to the IndexingReferenceMixin class

* Expand tests for reference_pattern validator:

- Prevent inclusion of illegal characters
- Prevent multiple groups of hash (#) characters
- Add unit tests

* Validator now checks for valid strftime formatter

* Adds build order reference pattern

* Adds function for creating a valid regex from the supplied pattern

- More unit tests
- Use it to validate BuildOrder reference field

* Refactoring the whole thing again - try using python string.format

* remove datetime-matcher from requirements.txt

* Add some more formatting helper functions

- Construct a regular expression from a format string
- Extract named values from a string, based on a format string

* Fix validator for build order reference field

* Adding unit tests for the new format string functionality

* Adds validation for reference fields

* Require the 'ref' format key as part of a valid reference pattern

* Extend format extraction to allow specification of integer groups

* Remove unused import

* Fix requirements

* Add method for generating the 'next' reference field for a model

* Fix function for generating next BuildOrder reference value

- A function is required as class methods cannot be used
- Simply wraps the existing class method

* Remove BUILDORDER_REFERENCE_REGEX setting

* Add unit test for build order reference field validation

* Adds unit testing for extracting integer values from a reference field

* Fix bugs from previous commit

* Add unit test for generation of default build order reference

* Add data migration for BuildOrder model

- Update reference field with old prefix
- Construct new pattern based on old prefix

* Adds unit test for data migration

- Check that the BuildOrder reference field is updated as expected

* Remove 'BUILDORDER_REFERENCE_PREFIX' setting

* Adds new setting for SalesOrder reference pattern

* Update method by which next reference value is generated

* Improved error handling in api_tester code

* Improve automated generation of order reference fields

- Handle potential errors
- Return previous reference if something goes wrong

* SalesOrder reference has now been updated also

- New reference pattern setting
- Updated default and validator for reference field
- Updated serializer and API
- Added unit tests

* Migrate the "PurchaseOrder" reference field to the new system

* Data migration for SalesOrder and PurchaseOrder reference fields

* Remove PURCHASEORDER_REFERENCE_PREFIX

* Remove references to SALESORDER_REFERENCE_PREFIX

* Re-add maximum value validation

* Bug fixes

* Improve algorithm for generating new reference

- Handle case where most recent reference does not conform to the reference pattern

* Fixes for 'order' unit tests

* Unit test fixes for order app

* More unit test fixes

* More unit test fixing

* Revert behaviour for "extract_int" clipping function

* Unit test value fix

* Prevent build order notification if we are importing records

InvenTree/build/serializers.py

@@ -11,7 +11,7 @@ from rest_framework import serializers
 from rest_framework.serializers import ValidationError
 
 from InvenTree.serializers import InvenTreeModelSerializer, InvenTreeAttachmentSerializer
-from InvenTree.serializers import ReferenceIndexingSerializerMixin, UserSerializer
+from InvenTree.serializers import UserSerializer
 
 import InvenTree.helpers
 from InvenTree.helpers import extract_serial_numbers
@@ -28,7 +28,7 @@ from users.serializers import OwnerSerializer
 from .models import Build, BuildItem, BuildOrderAttachment
 
 
-class BuildSerializer(ReferenceIndexingSerializerMixin, InvenTreeModelSerializer):
+class BuildSerializer(InvenTreeModelSerializer):
     """Serializes a Build object."""
 
     url = serializers.CharField(source='get_absolute_url', read_only=True)
@@ -74,6 +74,16 @@ class BuildSerializer(ReferenceIndexingSerializerMixin, InvenTreeModelSerializer
         if part_detail is not True:
             self.fields.pop('part_detail')
 
+    reference = serializers.CharField(required=True)
+
+    def validate_reference(self, reference):
+        """Custom validation for the Build reference field"""
+
+        # Ensure the reference matches the required pattern
+        Build.validate_reference_field(reference)
+
+        return reference
+
     class Meta:
         """Serializer metaclass"""
         model = Build