# 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.
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## Dependencies
* Python 3.6, 3.7, or 3.8
* Django 2.2 or 3.0
## Installation
`pip install 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 3.7 and 3.8, dropped support for <3.6
* added support for Django 2.2 and 3.0, dropped support for <2.2