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## Features | ||
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* Remove all existing local migration files and recreate them as initial migrations | ||
* Configuration singleton in Django admin to prepare your clean-up deployment | ||
* Management command for your pipeline to update Django's migration history table to reflect the changed migrations | ||
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## Motivation | ||
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Working with any proper ORM will result in database changes which are reflected in migration files to update your | ||
different environment's database structure. These files are versioned in your repository and if you follow any of the | ||
most popular deployment approaches, they won't be needed when they are deployed on production. This means, they clutter | ||
your repo, might lead to merge conflicts in the future and will slow down your test setup. | ||
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Django's default way of handling this is called "squashing". This approach is covered broadly in the | ||
[official documentation](https://docs.djangoproject.com/en/dev/topics/migrations/#migration-squashing). The main | ||
drawback here is, that you have to take care of circular dependencies between models. Depending on your project's | ||
size, this can take a fair amount of time. | ||
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The main benefit of squashing migrations is, that the history stays intact, therefore it can be used for example in | ||
package which can be installed by anybody and you don't have control over their database. | ||
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If you are working on a "regular" application, you have full control over your data(bases) and once everything has | ||
been applied on the "last" system, typically production, the migrations are obsolete. To avoid spending much time on | ||
fixing squashed migrations you won't need, you can use the "migration zero" pattern. In a nutshell, this means: | ||
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* Delete all your local migration files | ||
* Recreate initial migration files containing your current model state | ||
* Fix the migration history on every of your environments |
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.ambient-package-update/templates/snippets/installation.tpl
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## Installation | ||
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- Install the package via pip: | ||
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`pip install {{ package_name|replace("_", "-") }}` | ||
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or via pipenv: | ||
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`pipenv install {{ package_name|replace("_", "-") }}` | ||
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- Add module to `INSTALLED_APPS` within the main django `settings.py`: | ||
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```` | ||
INSTALLED_APPS = ( | ||
... | ||
'{{ package_name }}', | ||
) | ||
```` | ||
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{% if has_migrations %} | ||
- Apply migrations by running: | ||
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`python ./manage.py migrate` | ||
{% endif %} | ||
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- Add this block to your loggers in your main Django `settings.py` to show logs in your console. | ||
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```python | ||
"django_migration_zero": { | ||
"handlers": ["console"], | ||
"level": "INFO", | ||
"propagate": True, | ||
}, | ||
``` |
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Welcome to **django-migration-zero** - the holistic implementation of "migration zero" pattern for | ||
Django covering local changes and CI/CD pipeline adjustments. | ||
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This package implements the "migration zero" pattern to clean up your local migrations and provides convenient | ||
management commands to recreate your migration files and updating your migration history on your environments | ||
(like test or production systems). |
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