1 files changed, 8 insertions, 5 deletions
diff --git a/django/db/models/query.py b/django/db/models/query.py
index e8d9006b48..45c0320254 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -559,16 +559,19 @@ class QuerySet(object):
             return objects[0]
         return None
 
-    def in_bulk(self, id_list):
+    def in_bulk(self, id_list=None):
         """
         Returns a dictionary mapping each of the given IDs to the object with
-        that ID.
+        that ID. If `id_list` isn't provided, the entire QuerySet is evaluated.
         """
         assert self.query.can_filter(), \
             "Cannot use 'limit' or 'offset' with in_bulk"
-        if not id_list:
-            return {}
-        qs = self.filter(pk__in=id_list).order_by()
+        if id_list is not None:
+            if not id_list:
+                return {}
+            qs = self.filter(pk__in=id_list).order_by()
+        else:
+            qs = self._clone()
         return {obj._get_pk_val(): obj for obj in qs}
 
     def delete(self):