There are many questions about this Exception:
AttributeError: Cannot set values on a ManyToManyField which specifies an intermediary model. Use myapp.MyThr
I found a way to tell django to ignore the extra data:
class MyThroughModel(Model): class Meta(): auto_created=True ...
Update
This creates issues with the django internal migrations. We updated our code and don't use auto_created = True any more.
auto_created = True