Support image uploads in the "notes" markdown fields (#4615)

* Support image uploads in the "notes" markdown fields

- Implemented using the existing EasyMDE library
- Copy / paste support
- Drag / drop support

* Remove debug message

* Updated API version

* Better UX when saving notes

* Pin PIP version (for testing)

* Bug fixes

- Fix typo
- Use correct serializer type

* Add unit testing

* Update role permissions

* Typo fix

* Update migration file

* Adds a notes mixin class to be used for refactoring

* Refactor existing models with notes to use the new mixin

* Add helper function for finding all model types with a certain mixin

* Refactor barcode plugin to use new method

* Typo fix

* Add daily task to delete old / unused notes

* Bug fix for barcode refactoring

* Add unit testing for function

InvenTree/order/migrations/0091_auto_20230419_0037.py

@@ -0,0 +1,34 @@
+# Generated by Django 3.2.18 on 2023-04-19 00:37
+
+import InvenTree.fields
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('order', '0090_auto_20230412_1752'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='purchaseorder',
+            name='notes',
+            field=InvenTree.fields.InvenTreeNotesField(blank=True, help_text='Markdown notes (optional)', max_length=50000, null=True, verbose_name='Notes'),
+        ),
+        migrations.AlterField(
+            model_name='returnorder',
+            name='notes',
+            field=InvenTree.fields.InvenTreeNotesField(blank=True, help_text='Markdown notes (optional)', max_length=50000, null=True, verbose_name='Notes'),
+        ),
+        migrations.AlterField(
+            model_name='salesorder',
+            name='notes',
+            field=InvenTree.fields.InvenTreeNotesField(blank=True, help_text='Markdown notes (optional)', max_length=50000, null=True, verbose_name='Notes'),
+        ),
+        migrations.AlterField(
+            model_name='salesordershipment',
+            name='notes',
+            field=InvenTree.fields.InvenTreeNotesField(blank=True, help_text='Markdown notes (optional)', max_length=50000, null=True, verbose_name='Notes'),
+        ),
+    ]

InvenTree/order/models.py

@@ -32,11 +32,11 @@ from common.notifications import InvenTreeNotificationBodies
 from common.settings import currency_code_default
 from company.models import Company, Contact, SupplierPart
 from InvenTree.exceptions import log_error
-from InvenTree.fields import (InvenTreeModelMoneyField, InvenTreeNotesField,
-                              InvenTreeURLField, RoundingDecimalField)
+from InvenTree.fields import (InvenTreeModelMoneyField, InvenTreeURLField,
+                              RoundingDecimalField)
 from InvenTree.helpers import decimal2string, getSetting, notify_responsible
 from InvenTree.models import (InvenTreeAttachment, InvenTreeBarcodeMixin,
-                              ReferenceIndexingMixin)
+                              InvenTreeNotesMixin, ReferenceIndexingMixin)
 from InvenTree.status_codes import (PurchaseOrderStatus, ReturnOrderLineStatus,
                                     ReturnOrderStatus, SalesOrderStatus,
                                     StockHistoryCode, StockStatus)
@@ -131,7 +131,7 @@ class TotalPriceMixin(models.Model):
         return total
 
 
-class Order(InvenTreeBarcodeMixin, MetadataMixin, ReferenceIndexingMixin):
+class Order(InvenTreeBarcodeMixin, InvenTreeNotesMixin, MetadataMixin, ReferenceIndexingMixin):
     """Abstract model for an order.
 
     Instances of this class:
@@ -234,8 +234,6 @@ class Order(InvenTreeBarcodeMixin, MetadataMixin, ReferenceIndexingMixin):
         related_name='+',
     )
 
-    notes = InvenTreeNotesField(help_text=_('Order notes'))
-
     @classmethod
     def get_status_class(cls):
         """Return the enumeration class which represents the 'status' field for this model"""
@@ -1330,7 +1328,7 @@ class SalesOrderLineItem(OrderLineItem):
         return self.shipped >= self.quantity
 
 
-class SalesOrderShipment(MetadataMixin, models.Model):
+class SalesOrderShipment(InvenTreeNotesMixin, MetadataMixin, models.Model):
     """The SalesOrderShipment model represents a physical shipment made against a SalesOrder.
 
     - Points to a single SalesOrder object
@@ -1389,8 +1387,6 @@ class SalesOrderShipment(MetadataMixin, models.Model):
         default='1',
     )
 
-    notes = InvenTreeNotesField(help_text=_('Shipment notes'))
-
     tracking_number = models.CharField(
         max_length=100,
         blank=True,