Two error messages about Django migrate

• django.db.Migrations.state.InvalidBaseError
• psycopg2.programingerror "foo" relation dose not exit

One of these error messages might happen while I migrating a Django project with many Apps.

The second error happened if I used PostgreSQL.

A work around for this annoyance is to employ a two-phase migration.

First, comment out Apps in settings.py, but leave Django's Apps alone. Run './manage.py migrate'

Then, uncomment Apps, migrate again.