refactor(apis_entities): use mergeform templatetag

The new mergeform templatetag allows us to simply include the merge form
in the abstractentity_form.html template using the templatetag. This
means we don't have to override the view anymore and we can therefore
drop the custom EntitiesUpdate view, which was only there to inject the
mergeform into the context.
Dropping the EntitiesUpdate view also means dropping the custom route
pointing to it as well as dropping the `get_edit_url` override of the
AbstractEntity.

apis_core/apis_entities/models.py

@@ -50,17 +50,6 @@ def get_or_create_uri(cls, uri):
     def get_entity_list_filter(cls):
         return None
 
-    def get_edit_url(self):
-        """
-        We override the edit url, because entities have a
-        custom view that includes the relations
-        """
-        ct = ContentType.objects.get_for_model(self)
-        return reverse(
-            "apis_core:apis_entities:generic_entities_edit_view",
-            args=[ct.model, self.id],
-        )
-
     @functools.cached_property
     def get_prev_id(self):
         if NEXT_PREV:

apis_core/apis_entities/templates/apis_core/apis_entities/abstractentity_form.html

@@ -16,6 +16,7 @@
   </div>
   <div class="card mt-2">
     <div class="card-body">
+      {% mergeform as mergeform %}
       {% if mergeform %}
         {% crispy mergeform mergeform.helper %}
       {% endif %}

apis_core/apis_entities/urls.py

@@ -9,7 +9,6 @@
     EntitiesAutocomplete,
     EntitiesDuplicate,
     EntitiesMerge,
-    EntitiesUpdate,
 )
 from apis_core.generic.views import Create, Delete, Detail, List
 
@@ -62,11 +61,6 @@ def to_url(self, value):
         Detail.as_view(),
         name="generic_entities_detail_view",
     ),
-    path(
-        "<int:pk>/edit/",
-        EntitiesUpdate.as_view(),
-        name="generic_entities_edit_view",
-    ),
     path(
         "<int:pk>/delete/",
         Delete.as_view(),

apis_core/apis_entities/views.py

@@ -11,14 +11,7 @@
 from apis_core.apis_entities.forms import EntitiesMergeForm
 from apis_core.apis_metainfo.models import RootObject
 from apis_core.generic.helpers import generate_search_filter
-from apis_core.generic.views import GenericModelMixin, Update
-
-
-class EntitiesUpdate(Update):
-    def get_context_data(self, *args, **kwargs):
-        context = super().get_context_data(*args, **kwargs)
-        context["mergeform"] = EntitiesMergeForm(instance=self.get_object())
-        return context
+from apis_core.generic.views import GenericModelMixin
 
 
 class EntitiesDuplicate(GenericModelMixin, PermissionRequiredMixin, View):