You should think of migrations as a version control system for your database. If this didn't happen, the migration would try to create the ForeignKey column.
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The following data migration works in 1.7, but fails in 1.8a1 def forwards(apps, schema_editor): A = apps.get_model('app_name', 'A') B.
Jul 23, 2014. This tutorial takes you deeper through the new Django migration system. South the first time you run migrations, Django will first check the database. main that defined the table we wanted to reference in our foreign key.
Django is well suited for data-driven Web sites, because it comes with Django. mysite_project books migrations __init__.py admin.py apps.py models.py tests. py. publisher (a one-to-many relationship – aka foreign key – to publishers).
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Mar 14, 2016. This is likely a case where you want to do a multi-stage migration. Step 1, add a new field for the ForeignKey, making sure to mark it as null:. Now that your data is transferred to the new field, you could actually be done and.
Jun 12, 2015. Django 1.7 comes with a built-in migration system for your data. This guide will show you, step by step, how to convert a Foreign Key field into.
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