Removed un-needed properties on script tags for JS imports.

Refactored sorting filters from class method into a model property with a default of an empty dictionary.
Refactored sortable admin class to not make two calls to determine sortability and also to get objects for sorting.
Added sorting_filters to sortable admin queryset.

sample_project/app/admin.py

@@ -60,4 +60,8 @@ class ProjectAdmin(SortableAdmin):
 admin.site.register(Project, ProjectAdmin)
 
 
-admin.site.register(Person, SortableAdmin)
+class PersonAdmin(SortableAdmin):
+    sortable_change_list_with_sort_link_template = 'app/person/admin/change_list_with_sort_link.html'
+
+
+admin.site.register(Person, PersonAdmin)

sample_project/app/models.py

@@ -105,9 +105,7 @@ class Person(Sortable):
     last_name = models.CharField(max_length=50)
     is_board_member = models.BooleanField(default=False)
 
+    sorting_filters = {'is_board_member': True}
+
     def __unicode__(self):
         return '{} {}'.format(self.first_name, self.last_name)
-
-    @classmethod
-    def ordering_subset(cls):
-        return cls.objects.filter(is_board_member=True)