Skip to main content

Detect backward incompatible migrations for your django project

Project description

Django migration linter

Detect backward incompatible migrations for your Django project. It will save you time by making sure migrations will not break with a older codebase.

Build Status codecov PyPI PR_Welcome 3YD_Hiring GitHub_Stars

Quick installation

pip install django-migration-linter

And add the migration linter your INSTALLED_APPS:


Usage example

$ python lintmigrations

(app_add_not_null_column, 0001_create_table)... OK
(app_add_not_null_column, 0002_add_new_not_null_field)... ERR
        NOT NULL constraint on columns
(app_drop_table, 0001_initial)... OK
(app_drop_table, 0002_delete_a)... ERR
        DROPPING table
(app_ignore_migration, 0001_initial)... OK
(app_ignore_migration, 0002_ignore_migration)... IGNORE
(app_rename_table, 0001_initial)... OK
(app_rename_table, 0002_auto_20190414_1500)... ERR
        RENAMING tables

*** Summary ***
Valid migrations: 4/8
Erroneous migrations: 3/8
Migrations with warnings: 0/8
Ignored migrations: 1/8

The linter analysed all migrations from the Django project. It found 3 migrations that are doing backward incompatible operations and 1 that is explicitly ignored. The list of incompatibilities that the linter analyses can be found at docs/

More advanced usages of the linter and options can be found at docs/


One can either integrate the linter in the CI and the lintmigrations command, or detect incompatibilities during generation with

$ python makemigrations --lint

Migrations for 'app_correct':
    - Add field column to a
Linting for 'app_correct':
(app_correct, 0003_a_column)... ERR
        NOT NULL constraint on columns

The migration linter detected that this migration is not be backward compatible.
- If you keep the migration, you will want to fix the issue or ignore the migration.
- By default, the newly created migration file will be deleted.
Do you want to keep the migration? [y/N]
Deleted tests/test_project/app_correct/migrations/

The linter found that the newly created migration is not backward compatible and deletes the files. This behaviour can be the default of the makemigrations command through the MIGRATION_LINTER_OVERRIDE_MAKEMIGRATIONS Django settings. Find out more about the makemigrations command at docs/

More information

Please find more documentation generally in the docs/ folder.

Some implementation details can found in the ./docs/internals/ folder.

Blog post

They talk about the linter


  • django-test-migrations - Test django schema and data migrations, including migrations' order and best practices.


django-migration-linter is released under the Apache 2.0 License.

Maintained by David Wobrock

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for django-migration-linter, version 3.0.1
Filename, size File type Python version Upload date Hashes
Filename, size django_migration_linter-3.0.1-py2.py3-none-any.whl (91.4 kB) File type Wheel Python version py2.py3 Upload date Hashes View
Filename, size django-migration-linter-3.0.1.tar.gz (45.7 kB) File type Source Python version None Upload date Hashes View

Supported by

AWS AWS Cloud computing Datadog Datadog Monitoring Facebook / Instagram Facebook / Instagram PSF Sponsor Fastly Fastly CDN Google Google Object Storage and Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Salesforce Salesforce PSF Sponsor Sentry Sentry Error logging StatusPage StatusPage Status page