django-deprecate-fields 0.2.1

This package allows deprecating model fields and allows removing them in a backwards compatible manner.

Django - Deprecate Field

Installation

pip install django-deprecate-fields

Usage

Assume the simple following model:

from django.db import models

class MyModel(models.Model):
    field1 = models.CharField()
    field2 = models.CharField()

In order to remove field1, it should first be marked as deprecated:

from django.db import models
from django_deprecate_fields import deprecate_field

class MyModel(models.Model):
    field1 = deprecate_field(models.CharField())
    field2 = models.CharField()

Secondly, makemigrations should be called, which will change the field to be nullable. Any lingering references to it in your code will return None (or optionally any value or callable passed to deprecate_field as the return_instead argument)

Lastly, after the changes above have been deployed, field1 can then safely be removed in the model (plus another makemigrations run)

Custom django commands

If you need the actual field to be returned when a django command other than makemigrations, migrate or showmigrations is run, you can specify the DEPRECATE_FIELD_CUSTOM_MIGRATION_COMMAND parameter in the settings.

For instance if you generate migrations with pgmakemigrations instead of makemigrations, you can add this to your settings:

DEPRECATE_FIELD_CUSTOM_MIGRATION_COMMAND = {"pgmakemigrations"}

Contributing

First of all, thank you very much for contributing to this project. Please base your work on the master branch and target master in your pull request.

License

django-deprecate-fields is released under the Apache 2.0 License.