[Answered ]-South: how to ignore a changed model while creating a migration for an app

There are many ways to create migration. But I will only defined two ways.

 //migrate the changes of all models of the app
 ./manage.py schemamigration app --auto

 //migrate only the changes of the given model or 1 model
 python manage.py schemamigration app_name extend_modelname --auto