Avoid an O(n**2) operation where O(n) will suffice. Possibly worth a second or two when running the test suite.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14433 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/__init__.py

@@ -631,8 +631,10 @@ class BaseDatabaseIntrospection(object):
             for model in models.get_models(app):
                 if router.allow_syncdb(self.connection.alias, model):
                     all_models.append(model)
-        return set([m for m in all_models
-            if self.table_name_converter(m._meta.db_table) in map(self.table_name_converter, tables)
+        tables = map(self.table_name_converter, tables)
+        return set([
+            m for m in all_models
+            if self.table_name_converter(m._meta.db_table) in tables
         ])
 
     def sequence_list(self):