15794 Make "related objects" dynamic (#15876)

* Closes #15794: Make "related objects" dynamic

Instead of hardcoding relationships between models for the detail view,
they are now dynamically generated.

* Fix related models call

* Remove extra related models hook

Instead of providing a rarely used hook method, additional related
models can now be passed directly to the lookup method.

* Fix relations view for ASNs

ASNs have ManyToMany relationships and therefore can't used automatic
resolving. Explicit relations have been restored as before.

* Add method call keywords for clarification

* Cleanup related models

---------

Co-authored-by: Jeremy Stretch <jstretch@netboxlabs.com>

netbox/virtualization/views.py

@@ -20,7 +20,7 @@ from netbox.views import generic
 from tenancy.views import ObjectContactsView
 from utilities.query import count_related
 from utilities.query_functions import CollateAsChar
-from utilities.views import ViewTab, register_model_view
+from utilities.views import GetRelatedModelsMixin, ViewTab, register_model_view
 from . import filtersets, forms, tables
 from .models import *
 
@@ -39,16 +39,12 @@ class ClusterTypeListView(generic.ObjectListView):
 
 
 @register_model_view(ClusterType)
-class ClusterTypeView(generic.ObjectView):
+class ClusterTypeView(GetRelatedModelsMixin, generic.ObjectView):
     queryset = ClusterType.objects.all()
 
     def get_extra_context(self, request, instance):
-        related_models = (
-            (Cluster.objects.restrict(request.user, 'view').filter(type=instance), 'type_id'),
-        )
-
         return {
-            'related_models': related_models,
+            'related_models': self.get_related_models(request, instance),
         }
 
 
@@ -99,16 +95,12 @@ class ClusterGroupListView(generic.ObjectListView):
 
 
 @register_model_view(ClusterGroup)
-class ClusterGroupView(generic.ObjectView):
+class ClusterGroupView(GetRelatedModelsMixin, generic.ObjectView):
     queryset = ClusterGroup.objects.all()
 
     def get_extra_context(self, request, instance):
-        related_models = (
-            (Cluster.objects.restrict(request.user, 'view').filter(group=instance), 'group_id'),
-        )
-
         return {
-            'related_models': related_models,
+            'related_models': self.get_related_models(request, instance),
         }