Merge pull request #2475 from sdreher/master

 ManyRelatedField.get_value clearing field on partial update

1 files changed, 5 insertions, 0 deletions

diff --git a/rest_framework/relations.py b/rest_framework/relations.py
index aa0c2def..13793f37 100644
--- a/rest_framework/relations.py
+++ b/rest_framework/relations.py
@@ -338,7 +338,12 @@ class ManyRelatedField(Field):
         # We override the default field access in order to support
         # lists in HTML forms.
         if html.is_html_input(dictionary):
+            # Don't return [] if the update is partial
+            if self.field_name not in dictionary:
+                if getattr(self.root, 'partial', False):
+                    return empty
             return dictionary.getlist(self.field_name)
+
         return dictionary.get(self.field_name, empty)
 
     def to_internal_value(self, data):