Part stocktake (#4069)

* Remove stat context variables

* Revert "Remove stat context variables"

This reverts commit 0989c308d0.

* Allow longer timeout for image download tests

* Create PartStocktake model

Model for representing stocktake entries against any given part

* Admin interface support for new model

* Adds API endpoint for listing stocktake information

* Bump API version

* Enable filtering and ordering for API endpoint

* Add model to permission group

* Add UI hooks for displaying stocktake data for a particular part

* Fix encoded type for 'quantity' field

* Load stocktake table for part

* Add "stocktake" button

* Add "note" field for stocktake

* Add user information when performing stocktake

* First pass at UI elements for performing stocktake

* Add user information to stocktake table

* Auto-calculate quantity based on available stock items

* add stocktake data as tabular inline (admin)

* js linting

* Add indication that a stock item has not been updated recently

* Display last stocktake information on part page

* js style fix

* Test fix for ongoing CI issues

* Add configurable option for controlling default "delete_on_deplete" behaviour

* Add id values to cells

* Hide action buttons (at least for now)

* Adds refresh button to table

* Add API endpoint to delete or edit stocktake entries

* Adds unit test for API list endpoint

* javascript linting

* More unit testing

* Add Part API filter for stocktake

* Add 'last_stocktake' field to Part model

- Gets filled out automatically when a new PartStocktake instance is created

* Update part table to include last_stocktake date

* Add simple unit test

* Fix test

InvenTree/part/admin.py

@@ -104,6 +104,11 @@ class PartResource(InvenTreeResource):
         models.Part.objects.rebuild()
 
 
+class StocktakeInline(admin.TabularInline):
+    """Inline for part stocktake data"""
+    model = models.PartStocktake
+
+
 class PartAdmin(ImportExportModelAdmin):
     """Admin class for the Part model"""
 
@@ -122,6 +127,10 @@ class PartAdmin(ImportExportModelAdmin):
         'default_supplier',
     ]
 
+    inlines = [
+        StocktakeInline,
+    ]
+
 
 class PartPricingAdmin(admin.ModelAdmin):
     """Admin class for PartPricing model"""
@@ -133,6 +142,12 @@ class PartPricingAdmin(admin.ModelAdmin):
     ]
 
 
+class PartStocktakeAdmin(admin.ModelAdmin):
+    """Admin class for PartStocktake model"""
+
+    list_display = ['part', 'date', 'quantity', 'user']
+
+
 class PartCategoryResource(InvenTreeResource):
     """Class for managing PartCategory data import/export."""
 
@@ -400,3 +415,4 @@ admin.site.register(models.PartTestTemplate, PartTestTemplateAdmin)
 admin.site.register(models.PartSellPriceBreak, PartSellPriceBreakAdmin)
 admin.site.register(models.PartInternalPriceBreak, PartInternalPriceBreakAdmin)
 admin.site.register(models.PartPricing, PartPricingAdmin)
+admin.site.register(models.PartStocktake, PartStocktakeAdmin)