Ticket #5372: newforms-admin-query-caching.diff

django/contrib/admin/options.py

@@ -661 +661 @@
         self.parent_model = parent_model
         self.opts = self.model._meta
         # TODO: pass a fields arg into forms.inline_formset if/when we have one
-        self.formset_class = forms.inline_formset(parent_model, self.model, fk_name=self.fk_name, formfield_callback=self.formfield_for_dbfield, extra=self.extra)
+        
+    def formfield_for_dbfield(self, db_field, **kwargs):
+        if isinstance(db_field, models.ForeignKey):
+            kwargs['cache_choices'] = True
+        return super(InlineModelAdmin, self).formfield_for_dbfield(db_field, **kwargs)
+            
+    def _formset_class(self):
+        return forms.inline_formset(self.parent_model, self.model, fk_name=self.fk_name, formfield_callback=self.formfield_for_dbfield, extra=self.extra)
+    formset_class = property(_formset_class)
 
     def fieldsets(self, request):
         """