Removed legacy ORM lookup support per deprecation timeline; refs #16187.

django/utils/tree.py

@@ -81,13 +81,6 @@ class Node(object):
         """
         return other in self.children
 
-    def _prepare_data(self, data):
-        """
-        A subclass hook for doing subclass specific transformations of the
-        given data on combine() or add().
-        """
-        return data
-
     def add(self, data, conn_type, squash=True):
         """
         Combines this tree and the data represented by data using the
@@ -105,7 +98,6 @@ class Node(object):
         """
         if data in self.children:
             return data
-        data = self._prepare_data(data)
         if not squash:
             self.children.append(data)
             return data