Hi Simon, Thank you so very much for your assistance. It was a very simple model, so it had no foreign keys, and I’m relieved that I won’t have to do some manual database operations to get this working. It has migrated successfully! Thank you, Matthew
From: django-users@googlegroups.com [mailto:django-users@googlegroups.com] On Behalf Of Simon Charette Sent: Thursday, November 15, 2018 6:33 PM To: Django users Subject: Re: Migrations - moving model between apps Hello Matthew, I'm going to assume no foreign keys are pointing to the model "Foo" you are trying to move from the app "old" to "new". If it's the case then simply repoint them and run makemigrations once the following steps are completed. You could wrap the generated AlterField in SeparateDatabaseAndState to avoid database level foreign key constraints reconstruction if it's critical to your application. Start by setting old.Foo.Meta.db_table = 'new_foo' and run makemigrations old. That should generate you a new migration with an AlterModelTable('foo', 'new_foo') operation. Within this migration you'll want to add a DeleteModel('foo') operation wrapped in a SeparateDatabaseAndState[0] after the AlterModelTable one. Your migration's operations should look like: operations = [ AlterModelTable('foo', 'new_foo'), SeparateDatabaseAndState([], [DeleteModel('foo')]), ] Now, move your "old.Foo" model definition to your "new" app, remove the new.Foo.Meta.db_table and run "makemigrations new". Edit the created "new" migration and wrap the CreateModel into a SeparateDatabaseAndState and make sure the migration depends on the "old" migration you just created. You migration should look like the following: dependencies = [ ('old', '000N_old_migration_name'), ] operations = [ SeparateDatabaseAndState([], [ CreateModel('foo, ...) )]), ] Note that this will not take care of renaming the content types and permissions that might have been created for your old.Foo model definition. You could use a RunPython operation to rename them appropriately. Cheers, Simon Le jeudi 15 novembre 2018 18:09:45 UTC-5, Matthew Pava a écrit : I’m moving a model to a different app in my project, and I want to keep the same data that I already have. I created a migration with a RunSQL operation that simply renames the table with the new app prefix. However, when I run makemigrations, Django insists on adding a migrations.CreateModel operation for me in the new app. How do I avoid that? -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com<mailto:django-users+unsubscr...@googlegroups.com>. To post to this group, send email to django-users@googlegroups.com<mailto:django-users@googlegroups.com>. Visit this group at https://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/20606f64-15b4-4946-bb3e-65276de63e40%40googlegroups.com<https://groups.google.com/d/msgid/django-users/20606f64-15b4-4946-bb3e-65276de63e40%40googlegroups.com?utm_medium=email&utm_source=footer>. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at https://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/59362e8a8331457b85670b56eb4e2d2b%40iss2.ISS.LOCAL. For more options, visit https://groups.google.com/d/optout.
