Documentation for PULL reverse_delete_rule

docs/changelog.rst

@@ -2,6 +2,10 @@
 Changelog
 =========
 
+Changes in 0.6.x
+=================
+- PULL reverse_delete_rule
+
 Changes in 0.6.10
 =================
 - Fixed basedict / baselist to return super(..)

docs/guide/defining-documents.rst

@@ -289,6 +289,10 @@ Its value can take any of the following constants:
 :const:`mongoengine.CASCADE`
   Any object containing fields that are refererring to the object being deleted
   are deleted first.
+:const:`mongoengine.PULL`
+  Removes the reference to the object (using MongoDB's "pull" operation)
+  from any object's fields of
+  :class:`~mongoengine.ListField` (:class:`~mongoengine.ReferenceField`).
 
 
 .. warning::

mongoengine/fields.py

@@ -656,6 +656,8 @@ class ReferenceField(BaseField):
       * NULLIFY     - Updates the reference to null.
       * CASCADE     - Deletes the documents associated with the reference.
       * DENY        - Prevent the deletion of the reference object.
+      * PULL        - Pull the reference from a :class:`~mongoengine.ListField`
+                      of references
 
     Alternative syntax for registering delete rules (useful when implementing
     bi-directional delete rules)