+class XOSModelSerializer(serializers.ModelSerializer):
+ def save_object(self, obj, **kwargs):
+
+ """ rest_framework can't deal with ManyToMany relations that have a
+ through table. In plstackapi, most of the through tables we have
+ use defaults or blank fields, so there's no reason why we shouldn't
+ be able to save these objects.
+
+ So, let's strip out these m2m relations, and deal with them ourself.
+ """
+ obj._complex_m2m_data={};\r
+ if getattr(obj, '_m2m_data', None):\r
+ for relatedObject in obj._meta.get_all_related_many_to_many_objects():\r
+ if (relatedObject.field.rel.through._meta.auto_created):\r
+ # These are non-trough ManyToMany relations and\r
+ # can be updated just fine\r
+ continue\r
+ fieldName = relatedObject.get_accessor_name()\r
+ if fieldName in obj._m2m_data.keys():\r
+ obj._complex_m2m_data[fieldName] = (relatedObject, obj._m2m_data[fieldName])\r
+ del obj._m2m_data[fieldName]\r
+\r
+ serializers.ModelSerializer.save_object(self, obj, **kwargs);
+
+ for (accessor, stuff) in obj._complex_m2m_data.items():
+ (relatedObject, data) = stuff
+ through = relatedObject.field.rel.through
+ local_fieldName = relatedObject.field.m2m_reverse_field_name()
+ remote_fieldName = relatedObject.field.m2m_field_name()
+
+ # get the current set of existing relations
+ existing = through.objects.filter(**{local_fieldName: obj});
+
+ data_ids = [item.id for item in data]
+ existing_ids = [getattr(item,remote_fieldName).id for item in existing]
+
+ #print "data_ids", data_ids
+ #print "existing_ids", existing_ids
+
+ # remove relations that are in 'existing' but not in 'data'
+ for item in list(existing):
+ if (getattr(item,remote_fieldName).id not in data_ids):
+ print "delete", getattr(item,remote_fieldName)
+ item.delete() #(purge=True)
+
+ # add relations that are in 'data' but not in 'existing'
+ for item in data:
+ if (item.id not in existing_ids):
+ #print "add", item
+ newModel = through(**{local_fieldName: obj, remote_fieldName: item})
+ newModel.save()
+