CODEWITHSUNDEEP
pythondjangodjango-migrations
jafarlihi
jafarlihi

Reputation: 100

How to remove a library whose initial migration is being depended on?

So my model used to inherit from a Message class of django-postman library.

Therefore my 0001_initial migration looks like this:

class Migration(migrations.Migration):

    initial = True

    dependencies = [
        ('postman', '0001_initial'),
    ]

    operations = [
        migrations.CreateModel(
            name='Message',
            fields=[
                ('message_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='postman.Message')),
                ('created_at', models.DateTimeField(auto_now_add=True)),
                ('deliver_at', models.DateTimeField(blank=True, null=True)),
                ('content', models.TextField(blank=True, null=True)),
            ],
            bases=('postman.message',),
        ),
    ]

Now I want to totally remove my own Message model. I can remove it normally and run makemigrations which creates 0004_delete_message that looks like this:

class Migration(migrations.Migration):

    dependencies = [
        ('postman', '0001_initial'),
        ('my_app', '0003_migrate_data_to_new_model'),
    ]

    operations = [
        migrations.DeleteModel(
            name='Message',
        ),
    ]

Now the issue is that I totally want to remove django-postman library, including from my INSTALLED_APPS. This creates the issue of both of these migrations not being applicable because they both depend on postman.0001_initial which doesn't exist anymore.

Is there clean way of going about that deprecation while still keeping my migrations working or do I have to manually edit my 0001_initial and run CreateModel for the model introduced in postman.0001_initial, and change bases of my model to point to that model I created?

Upvotes: 1

Views: 51

Answers (1)

Shaheed Haque
Shaheed Haque

Reputation: 723

You will need to modify 0001_initial as you suggest to conform to the state of the installed code at run time.

Upvotes: 1

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