![]() When changing the value of DEFAULT_AUTO_FIELD, migrations for the primary key of existing auto-created through tables cannot be generated currently. In anticipation of the changing default, a system check will provide a warning if you do not have an explicit setting for DEFAULT_AUTO_FIELD. Or on a per-model basis: from django.db import models class MyModel(models.Model): id = models.AutoField(primary_key= True) Or configure it on a per-app basis: from django.apps import AppConfig class MyAppConfig(AppConfig): default_auto_field = 'django.db.models.AutoField' name = 'my_app' To avoid unwanted migrations in the future, either explicitly set DEFAULT_AUTO_FIELD to AutoField: DEFAULT_AUTO_FIELD = 'django.db.models.AutoField' In a future Django release the default value of DEFAULT_AUTO_FIELD will be changed to BigAutoField. Also, new apps are generated with fault_auto_field set to BigAutoField. Starting with 3.2 new projects are generated with DEFAULT_AUTO_FIELD set to BigAutoField. Maintaining the historical behavior, the default value for DEFAULT_AUTO_FIELD is AutoField. No more needing to override primary keys in all models. The type of this implicit primary key can now be controlled via the DEFAULT_AUTO_FIELD setting and fault_auto_field attribute. When defining a model, if no field in a model is defined with primary_key=True an implicit primary key is added. Customizing type of auto-created primary keys With automatic AppConfig discovery, default_app_config is no longer needed. It was introduced for backwards-compatibility with the former style, with the intent to switch the ecosystem to the latter, but the switch didn’t happen. '') rather than the app config’s path (e.g. When the apps.py submodule exists and defines a single AppConfig subclass, Django now uses that configuration automatically, so you can remove default_app_config.ĭefault_app_config made it possible to declare only the application’s path in INSTALLED_APPS (e.g. Many define a default_app_config variable pointing to this class in their _init_.py. Most pluggable applications define an AppConfig subclass in an apps.py submodule. The full list of all changes can be found in the release notes for 3.0, 3.1 and 3.2. In this article, I’ll be listing out the changes made in the latest version which I found most interesting or most useful to my development life. That’s not to say they’re worse, just not supported for as long, so when security issues hit, you’re on your own. If you enjoy taking risks, moving fast and breaking stuff, then the regular releases are for you. If you’re not in the habit of upgrading often, I would recommend sticking with the LTS releases. Staying on the LTS version is always a trade-off between new features and stability, but there’s no right or wrong answer as to which you should be on. In the past, I’ve worked entirely on LTS versions. Since Django 2.2 was released in 2019, a lot has changed in software development, Python, and of course in Django. You might be wondering why it was released then. It has been around three years since Django 2.2 was first released The developer team promises that update is incredibly important for the future of Django, but it was also mentioned that no major features have been added.
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