Fix: migrations being generated when settings are altered

[Caiofcas]

Versions:

$ pip freeze
...
Django==3.2.11
djangorestframework==3.13.1
django-rest-durin==1.1.0
...

There are two settings changes which can generate new migrations inside the installed durin files currently.

The first one is when you change the DEFAULT_AUTO_FIELD setting in django to something other than models.BigAutoField, it can be detected by django as a change in the durin provided models, which can lead to migrations being generated for durin models.

This happens since durin does not explicitly provide an AppConfig class with the default_auto_field property set. See this SO question for another explanation of the problem.

The second is when you change one of the values which is directly referenced in one of the fields default argument (Client.token_ttl field with DEFAULT_TOKEN_TTL). If you change the value of these settings, it's interpreted as a change in the value of the argument, and it generates a migration.

This one can be fixed by changing the arg to reference a function which reads the setting at run time.

Example migration generated inside the durin migrations directory when you change some of this settings:

settings.py:

from datetime import timedelta

DEFAULT_AUTO_FIELD = "django.db.models.AutoField"

REST_DURIN = {
    "DEFAULT_TOKEN_TTL": timedelta(hours=6),
}

# Generated by Django 3.2.11 on 2022-11-25 18:02

import datetime
from django.db import migrations, models


class Migration(migrations.Migration):

    dependencies = [
        ('durin', '0002_client_throttlerate'),
    ]

    operations = [
        migrations.AlterField(
            model_name='authtoken',
            name='id',
            field=models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID'),
        ),
        migrations.AlterField(
            model_name='client',
            name='id',
            field=models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID'),
        ),
        migrations.AlterField(
            model_name='client',
            name='token_ttl',
            field=models.DurationField(default=datetime.timedelta(seconds=21600), help_text='\n            Token Time To Live (TTL) in timedelta. Format: <code>DAYS HH:MM:SS</code>.\n            ', verbose_name='Token Time To Live (TTL)'),
        ),
    ]

[eshaan7]

Thanks for this! The tests will pass in main as the CI file has been fixed.