Refactor states/status (#4857)

* add file for states

* move general definition out

* add some tests and docs

* add tests for invalid definitions

* make status_label tag generic

* move templatetags

* remove unused tag

* rename test file

* make status label a lookup

* rename tags

* move import structure

* add missing tag

* collect states dynamically

* fix context function

* move api function out

* add tests for tags

* rename tests

* refactor imports

* Add test for API function

* improve errors and add tests for imporved errors

* make test calls simpler

* refactor definitions to use enums

* switch to enum

* refactor definitions to use enums

* fix lookup

* fix tag name

* make _TAG lookup a function

* cleanup BaseEnum

* make _TAG definition simpler

* restructure status codes to enum

* reduce LoC

* type status codes as int

* add specific function for template context

* Add definition for lookups

* fix filter lookup

* TEST: "fix" action lookup

* Add missing migrations

* Make all group code references explict

* change default on models to value

* switch to IntEnum

* move groups into a seperate class

* only request _TAG if it exsists

* use value and list

* use dedicated groups

* fix stock assigment

* fix order code

* more fixes

* fix borked change

* fix render lookup

* add group

* fix import

* fix syntax

* clenup

* fix migrations

* fix typo

* fix wrong value usage

* fix test

* remove group section

* remove group section

* add more test cases

* Add more docstring

* move choices out of migrations

* change import ordeR?

* last try before I revert

* Update part.migrations.0112

- Add custom migration class which handles errors

* Add unit test for migration

- Ensure that the new fields are added to the model

* Update reference to PR

---------

Co-authored-by: Oliver Walters <oliver.henry.walters@gmail.com>

InvenTree/part/test_api.py

@@ -18,7 +18,7 @@ import company.models
 import order.models
 from common.models import InvenTreeSetting
 from company.models import Company, SupplierPart
-from InvenTree.status_codes import (BuildStatus, PurchaseOrderStatus,
+from InvenTree.status_codes import (BuildStatus, PurchaseOrderStatusGroups,
                                     StockStatus)
 from InvenTree.unit_test import InvenTreeAPITestCase
 from part.models import (BomItem, BomItemSubstitute, Part, PartCategory,
@@ -1628,7 +1628,7 @@ class PartDetailTests(PartAPITestBase):
         # How many parts are 'on order' for this part?
         lines = order.models.PurchaseOrderLineItem.objects.filter(
             part__part__pk=1,
-            order__status__in=PurchaseOrderStatus.OPEN,
+            order__status__in=PurchaseOrderStatusGroups.OPEN,
         )
 
         on_order = 0
@@ -1857,7 +1857,7 @@ class PartAPIAggregationTest(InvenTreeAPITestCase):
         StockItem.objects.create(part=cls.part, quantity=300)
 
         # Now create another 400 units which are LOST
-        StockItem.objects.create(part=cls.part, quantity=400, status=StockStatus.LOST)
+        StockItem.objects.create(part=cls.part, quantity=400, status=StockStatus.LOST.value)
 
     def get_part_data(self):
         """Helper function for retrieving part data"""
@@ -1992,7 +1992,7 @@ class PartAPIAggregationTest(InvenTreeAPITestCase):
             quantity=10,
             title='Making some assemblies',
             reference='BO-9999',
-            status=BuildStatus.PRODUCTION,
+            status=BuildStatus.PRODUCTION.value,
         )
 
         bom_item = BomItem.objects.get(pk=6)
@@ -2133,7 +2133,7 @@ class PartAPIAggregationTest(InvenTreeAPITestCase):
                 for line_item in sp.purchase_order_line_items.all():
                     po = line_item.order
 
-                    if po.status in PurchaseOrderStatus.OPEN:
+                    if po.status in PurchaseOrderStatusGroups.OPEN:
                         remaining = line_item.quantity - line_item.received
 
                         if remaining > 0: