admin: fix slow load for templates using get_links

passbook/admin/templates/administration/policy/list.html

@@ -47,12 +47,12 @@
                     <th role="columnheader">
                         <div>
                             <div>{{ policy.name }}</div>
-                            {% if not policy.policymodel_set.exists %}
+                            {% if not policy.bindings.exists %}
                             <i class="pf-icon pf-icon-warning-triangle"></i>
                             <small>{% trans 'Warning: Policy is not assigned.' %}</small>
                             {% else %}
                             <i class="pf-icon pf-icon-ok"></i>
-                            <small>{% blocktrans with object_count=policy.policymodel_set.all|length %}Assigned to {{ object_count }} objects.{% endblocktrans %}</small>
+                            <small>{% blocktrans with object_count=policy.bindings.all|length %}Assigned to {{ object_count }} objects.{% endblocktrans %}</small>
                             {% endif %}
                         </div>
                     </th>

passbook/admin/templatetags/admin_reflection.py

@@ -1,6 +1,4 @@
 """passbook admin templatetags"""
-import inspect
-
 from django import template
 from django.db.models import Model
 from django.utils.html import mark_safe
@@ -21,12 +19,14 @@ def get_links(model_instance):
         return links
 
     try:
-        for name, method in inspect.getmembers(
+        for name in dir(model_instance):
-            model_instance, predicate=inspect.ismethod
+            if not name.startswith(prefix):
-        ):
+                continue
-            if name.startswith(prefix):
+            value = getattr(model_instance, name)
+            if not callable(value):
+                continue
             human_name = name.replace(prefix, "").replace("_", " ").capitalize()
-                link = method()
+            link = value()
             if link:
                 links[human_name] = link
     except NotImplementedError:
@@ -46,11 +46,14 @@ def get_htmls(context, model_instance):
         return htmls
 
     try:
-        for name, method in inspect.getmembers(
+        for name in dir(model_instance):
-            model_instance, predicate=inspect.ismethod
+            if not name.startswith(prefix):
-        ):
+                continue
+            value = getattr(model_instance, name)
+            if not callable(value):
+                continue
             if name.startswith(prefix):
-                html = method(context.get("request"))
+                html = value(context.get("request"))
                 if html:
                     htmls.append(mark_safe(html))
     except NotImplementedError:

passbook/admin/views/overview.py

@@ -39,7 +39,7 @@ class AdministrationOverviewView(AdminRequiredMixin, TemplateView):
             application=None
         )
         kwargs["policies_without_binding"] = len(
-            Policy.objects.filter(policymodel__isnull=True)
+            Policy.objects.filter(bindings__isnull=True)
         )
         kwargs["cached_policies"] = len(cache.keys("policy_*"))
         return super().get_context_data(**kwargs)

passbook/policies/models.py

@@ -12,7 +12,7 @@ class PolicyBindingModel(models.Model):
     """Base Model for objects that have policies applied to them."""
 
     policies = models.ManyToManyField(
-        "Policy", through="PolicyBinding", related_name="+", blank=True
+        "Policy", through="PolicyBinding", related_name="bindings", blank=True
     )
 
     class Meta: