https://github.com/xplor/django-add-default-value-postgresql

Add default field value in Django migrations for PostgreSQL
https://github.com/xplor/django-add-default-value-postgresql

django postgresql

Last synced: 5 months ago
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Add default field value in Django migrations for PostgreSQL

• Host: GitHub
• URL: https://github.com/xplor/django-add-default-value-postgresql
• Owner: xplor
• License: apache-2.0
• Created: 2020-03-04T16:55:22.000Z (over 6 years ago)
• Default Branch: main
• Last Pushed: 2025-04-07T19:48:16.000Z (about 1 year ago)
• Last Synced: 2025-08-28T05:18:44.263Z (10 months ago)
• Topics: django, postgresql
• Language: Python
• Homepage:
• Size: 43.9 KB
• Stars: 5
• Watchers: 23
• Forks: 1
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Django Add Default Value for PostgreSQL

Django Migration Operation that can be used to transfer a field's default value

to the database scheme.

Based on [django-add-default-value](https://github.com/3YOURMIND/django-add-default-value/) by [3YOURMIND](https://github.com/3YOURMIND). This variant drops support for other databases, specifically the Azure ODBC driver which does not support current versions of Django.

[![CI](https://github.com/Mariana-Tek/django-add-default-value-postgresql/workflows/Python%20package/badge.svg)](https://github.com/Mariana-Tek/django-add-default-value-postgresql/actions?query=workflow%3A%22Python+package%22)

[![PyPi](https://img.shields.io/pypi/v/django-add-default-value-postgresql.svg?branch=master)](https://pypi.org/project/django-add-default-value-postgresql/)

## Supported Versions of Python and Django

- Python 3.10, 3.11, and 3.12

- Django 4.0, 4.1, 4.2, 5.0, 5.1, and 5.2

## Installation

`uv add django-add-default-value-postgresql`

You can then use `AddDefaultValue` in your migration file to transfer the default

values to your database. Afterwards, it's just the usual `./manage.py migrate`.

## Usage

Add this manually to an autogenerated Migration that adds a new field:

    AddDefaultValue(

        model_name='my_model',

        name='my_field',

        value='my_default'

    )

### Example

Given the following migration:

    operations = [

        migrations.AddField(

            field=models.CharField(default='my_default', max_length=255),

            model_name='my_model',

            name='my_field',

        ),

    ]

Modify the migration to add a default value:

    +from django_add_default_value import AddDefaultValue

    +

     operations = [

         migrations.AddField(

             field=models.CharField(default='my_default', max_length=255),

             model_name='my_model',

             name='my_field',

         ),

    +    AddDefaultValue(

    +        model_name='my_model',

    +        name='my_field',

    +        value='my_default'

    +    )

     ]

If you check `python manage.py sqlmigrate [app name] [migration]`,

you will see that the default value now gets set.

## Testing

You can test against multiple versions of Django using `tox`. To test across Python versions, use pyenv to run `tox` under each version.

## License

django-add-default-value-postgresql is released under the Apache 2.0 License, based on [django-add-default-value](https://github.com/3YOURMIND/django-add-default-value/) by [3YOURMIND](https://github.com/3YOURMIND) which is also released under the Apache 2.0 License.

### Changes from original source

- removed MySQL-related code

- removed MSSQL-related code

- added allow_migrate_model check on database_forwards and database_backwards

- added support for Python 3.10, 3.11, and 3.12, dropped support for <3.10

- added support for Django 4.0, 4.1, 4.2, 5.0, 5.1, and 5.2, dropped support for <4.0