Barcode Refactor (#3640)

* define a simple model mixin class for barcode

* Adds generic function for assigning a barcode to a model instance

* StockItem model now implements the BarcodeMixin class

* Implement simple unit tests for new code

* Fix unit tests

* Data migration for uid field

* Remove references to old 'uid' field

* Migration for removing old uid field from StockItem model

* Bump API version

* Change lookup_barcode to be a classmethod

* Change barcode_model_type to be a class method

* Cleanup for generic barcode scan and assign API:

- Raise ValidationError as appropriate
- Improved unit testing
- Groundwork for future generic implementation

* Further unit tests for barcode scanning

* Adjust error messages for compatibility

* Unit test fix

* Fix hash_barcode function

- Add unit tests to ensure it produces the same results as before the refactor

* Add BarcodeMixin to Part model

* Remove old format_barcode function from Part model

* Further fixes for unit tests

* Add support for assigning arbitrary barcode to Part instance

- Simplify barcode API
- Add more unit tests

* More unit test fixes

* Update unit test

* Adds generic endpoint for unassigning barcode data

* Update web dialog for unlinking a barcode

* Template cleanup

* Add Barcode mixin to StockLocation class

* Add some simple unit tests for new model mixin

* Support assigning / unassigning barcodes for StockLocation

* remove failing outdated test

* Update template to integrate new barcode support for StockLocation

* Add BarcodeMixin to SupplierPart model

* Adds QR code view for SupplierPart

* Major simplification of barcode API endpoints

- Separate existing barcode plugin into two separate classes
- Simplify and consolidate the response from barcode scanning
- Update unit testing

* Yet more unit test fixes

* Yet yet more unit test fixes

InvenTree/order/test_api.py

@@ -582,11 +582,11 @@ class PurchaseOrderReceiveTest(OrderTest):
         """Tests for checking in items with invalid barcodes:
 
         - Cannot check in "duplicate" barcodes
-        - Barcodes cannot match UID field for existing StockItem
+        - Barcodes cannot match 'barcode_hash' field for existing StockItem
         """
         # Set stock item barcode
         item = StockItem.objects.get(pk=1)
-        item.uid = 'MY-BARCODE-HASH'
+        item.barcode_hash = 'MY-BARCODE-HASH'
         item.save()
 
         response = self.post(
@@ -705,8 +705,8 @@ class PurchaseOrderReceiveTest(OrderTest):
         self.assertEqual(stock_2.last().location.pk, 2)
 
         # Barcodes should have been assigned to the stock items
-        self.assertTrue(StockItem.objects.filter(uid='MY-UNIQUE-BARCODE-123').exists())
-        self.assertTrue(StockItem.objects.filter(uid='MY-UNIQUE-BARCODE-456').exists())
+        self.assertTrue(StockItem.objects.filter(barcode_hash='MY-UNIQUE-BARCODE-123').exists())
+        self.assertTrue(StockItem.objects.filter(barcode_hash='MY-UNIQUE-BARCODE-456').exists())
 
     def test_batch_code(self):
         """Test that we can supply a 'batch code' when receiving items."""