[-] Retrieve content types lazily in Generic Relations admin

categories/genericcollection.py

@@ -1,23 +1,32 @@
 from django.contrib import admin
 from django.contrib.contenttypes.models import ContentType
+from django.core.urlresolvers import reverse, NoReverseMatch
+import json
 
 
 class GenericCollectionInlineModelAdmin(admin.options.InlineModelAdmin):
     ct_field = "content_type"
     ct_fk_field = "object_id"
 
-    def __init__(self, parent_model, admin_site):
-        super(GenericCollectionInlineModelAdmin, self).__init__(parent_model, admin_site)
+    def get_content_types(self):
         ctypes = ContentType.objects.all().order_by('id').values_list('id', 'app_label', 'model')
-        elements = ["%s: '%s/%s'" % (x, y, z) for x, y, z in ctypes]
-        self.content_types = "{%s}" % ",".join(elements)
+        elements = {}
+        for x, y, z in ctypes:
+            try:
+                elements[x] = reverse("admin:%s_%s_changelist" % (y, z))
+            except NoReverseMatch:
+                continue
+        return json.dumps(elements)
 
     def get_formset(self, request, obj=None, **kwargs):
         result = super(GenericCollectionInlineModelAdmin, self).get_formset(request, obj, **kwargs)
-        result.content_types = self.content_types
+        result.content_types = self.get_content_types()
         result.ct_fk_field = self.ct_fk_field
         return result
 
+    class Media:
+        js = ('contentrelations/js/genericlookup.js', )
+
 
 class GenericCollectionTabularInline(GenericCollectionInlineModelAdmin):
     template = 'admin/edit_inline/gen_coll_tabular.html'