Adding indexes to model fields in Django with migrations

Question

I am trying to add indexes on model fields using Field.db_index for an app that has migrations. Looking at Django\'s documentation all I need to do is to set

Answer 1

You can do this explicitly in your migration using Django's AddIndex and Index classes.

First create an empty migration with manage.py makemigrations --empty and then simply fill it out as follows:

from django.db import migrations
from django.db.models.indexes import Index
from django.db.migrations import AddIndex


class Migration(migrations.Migration):

    dependencies = [
        ('app_name', 'ref_to_previous_migration'),
    ]

    operations = [
        AddIndex('ModelName', Index(fields=['field_name'], name='my_index'))
    ]

You can use options on the Index class to specify fields, add a name, and do special custom things like index only part of the table, etc. Check the doc links above.