Ticket #2599: django_2599.diff

django/forms/__init__.py

@@ -972 +972 @@
         except validators.ValidationError, e:
             raise validators.CriticalValidationError, e.messages
 
+    def render(self, data):
+        # Make sure that the value will be a comma-separated string, not the
+        # string representation of a Python list of strings
+        if data is None:
+            data = ''
+        elif isinstance(data, list):
+            data = ','.join(data)
+        return TextField.render(self, data)
+
 class RawIdAdminField(CommaSeparatedIntegerField):
     def html2python(data):
         return data.split(',')