Defining _setup_lazy_indexes.

_setup_lazy_indexes is called but never defined?

fluent_pages/extensions/pagetypepool.py

@@ -8,7 +8,7 @@
 from fluent_pages.models import UrlNode
 from fluent_utils.load import import_apps_submodule
 from .pagetypebase import PageTypePlugin
-from six import itervalues
+from six import itervalues, iteritems
 
 
 __all__ = (
@@ -134,6 +134,13 @@ def _get_plugin_by_content_type(self, contenttype):
         return self.plugins[name]
 
 
+    def _setup_lazy_indexes(self):
+        if self._name_for_ctype_id is None:
+            self._name_for_ctype_id = {}
+            for name, plugin_instance in iteritems(self.plugins):
+                self._name_for_ctype_id[plugin_instance.type_id] = name
+
+
     def get_file_types(self):
         """
         Return the :class:`~django.contrib.contenttypes.models.ContentType` id's