Django-South DataMigration - is the application available in forward () but not backward ()?

Question

I am writing django south migration, which is model dependent in another application, so I turned on --freeze OTHERAPPNAME when I ran python manage.py datamigration …

However, in the forwards() function, I can access another model (with orm['otherappname.MyModelName'] ), however, in the backwards() step (which also depends on the model in otherappname), if I try to access orm['otherappname.MyModelName'] , I get an error

 *** KeyError: "The model 'mymodelname' from the app 'otherappname' is not available in this migration." 

I see details of frozen models at the bottom of the file. Why can't I access it?

NB: this model is created in another migration inside oraprappname, on which this datamigration depends.

Answer 1

In the opposite direction, the frozen ORM of the previous migration is actually used. This is logical when you think about it, but it is admittedly not very intuitive.

Moral: Freeze the models you need in your datamigration in a scheme that continues it.