Added QuerySetNoCache and QuerySet.no_cache() for lower memory consumption (#365)

docs/apireference.rst

@@ -49,6 +49,11 @@ Querying
 
    .. automethod:: mongoengine.queryset.QuerySet.__call__
 
+.. autoclass:: mongoengine.queryset.QuerySetNoCache
+   :members:
+
+   .. automethod:: mongoengine.queryset.QuerySetNoCache.__call__
+
 .. autofunction:: mongoengine.queryset.queryset_manager
 
 Fields

docs/changelog.rst

@@ -4,6 +4,7 @@ Changelog
 
 Changes in 0.8.3
 ================
+- Added QuerySetNoCache and QuerySet.no_cache() for lower memory consumption (#365)
 - Fixed sum and average mapreduce dot notation support (#375, #376)
 - Fixed as_pymongo to return the id (#386)
 - Document.select_related() now respects `db_alias` (#377)

docs/guide/querying.rst

@@ -16,7 +16,9 @@ fetch documents from the database::
 .. note::
 
     As of MongoEngine 0.8 the querysets utilise a local cache.  So iterating
-    it multiple times will only cause a single query.
+    it multiple times will only cause a single query.  If this is not the
+    desired behavour you can call :class:`~mongoengine.QuerySet.no_cache` to
+    return a non-caching queryset.
 
 Filtering queries
 =================