feat(generic): update Enrichview & GenericModel to work with generic uri

The `Uri` model now uses a generic foreign key instead of the direct
foreign key to the `RootObject`. This commit updates all occurences of
`root_object` to use the generic foreign key instead.

apis_core/generic/abc.py

@@ -165,7 +165,11 @@ def merge_with(self, entities):
                     for s in getattr(ent, f.name).all():
                         if s not in sl:
                             getattr(self, f.name).add(s)
-            Uri.objects.filter(root_object=ent).update(root_object=self)
+            self_content_type = ContentType.objects.get_for_model(self)
+            ent_content_type = ContentType.objects.get_for_model(ent)
+            Uri.objects.filter(content_type=ent_content_type, object_id=ent.id).update(
+                content_type=self_content_type, object_id=self.id
+            )
 
         for ent in entities:
             self.merge_fields(ent)

apis_core/generic/views.py

@@ -6,6 +6,7 @@
 from django.conf import settings
 from django.contrib import messages
 from django.contrib.auth.mixins import PermissionRequiredMixin
+from django.contrib.contenttypes.models import ContentType
 from django.core.exceptions import ImproperlyConfigured
 from django.forms import modelform_factory
 from django.forms.utils import pretty_name
@@ -458,12 +459,12 @@ def get(self, *args, **kwargs):
             return redirect(self.object.get_merge_url(self.uri))
         try:
             uriobj = Uri.objects.get(uri=self.uri)
-            if uriobj.root_object.id != self.object.id:
+            if uriobj.object_id != self.object.id:
                 messages.info(
                     self.request,
                     f"Object with URI {self.uri} already exists, you were redirected to the merge form.",
                 )
-                return redirect(self.object.get_merge_url(uriobj.root_object.id))
+                return redirect(self.object.get_merge_url(uriobj.object_id))
         except Uri.DoesNotExist:
             pass
         return super().get(*args, **kwargs)
@@ -500,7 +501,12 @@ def form_valid(self, form):
         importer = self.importer_class(self.uri, self.model)
         importer.import_into_instance(self.object, fields=update_fields)
         messages.info(self.request, f"Updated fields {update_fields}")
-        uri, created = Uri.objects.get_or_create(uri=self.uri, root_object=self.object)
+        content_type = ContentType.objects.get_for_model(self.model)
+        uri, created = Uri.objects.get_or_create(
+            uri=self.uri,
+            content_type=content_type,
+            object_id=self.object.id,
+        )
         if created:
             messages.info(self.request, f"Added uri {self.uri} to {self.object}")
         return super().form_valid(form)