How to Seamlessly Migrate Models Between Django Apps with Django 1.7?

Migrating Models Between Django Apps with Django 1.7

With Django 1.7, managing model structure has become more efficient. Suppose you have models in a single app that you need to distribute to individual apps. Here's how you can achieve this using Django migrations:

Removing Model from Old App

1. Create an empty migration in the old app:

   <code class="python">python manage.py makemigrations old_app --empty</code>

2. Add the following code to the generated migration file:

   <code class="python">class Migration(migrations.Migration):
       dependencies = []
   
       database_operations = [
           migrations.AlterModelTable('TheModel', 'newapp_themodel')
       ]
   
       state_operations = [
           migrations.DeleteModel('TheModel')
       ]
   
       operations = [
           migrations.SeparateDatabaseAndState(
               database_operations=database_operations,
               state_operations=state_operations)
       ]</code>

Adding Model to New App

1. Copy the model to the model.py file in the new app.

2. Create a migration in the new app:

   <code class="python">python manage.py makemigrations new_app</code>

3. Modify the generated migration file to include the following:

   <code class="python">class Migration(migrations.Migration):
   
       dependencies = [
           ('old_app', 'above_migration')
       ]
   
       state_operations = [
           migrations.CreateModel(
               name='TheModel',
               fields=[
                   ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
               ],
               options={
                   'db_table': 'newapp_themodel',
               },
               bases=(models.Model,),
           )
       ]
   
       operations = [
           migrations.SeparateDatabaseAndState(state_operations=state_operations)
       ]</code>

By following these steps, you can seamlessly move your models between Django apps, ensuring a cleaner and more organized database structure.

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