Django 3.2: default_auto_field

[fertek]

Application django-flatblocks displays this warning when used in Django 3.2:

WARNINGS:
flatblocks.FlatBlock: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'.
	HINT: Configure the DEFAULT_AUTO_FIELD setting or the AppConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'django.db.models.BigAutoField'.

To solve this issue, there should be a apps.py file with the following content:

from django.apps import AppConfig

class FlatblocksConfig(AppConfig):
    default_auto_field = 'django.db.models.AutoField'

More information here and here.