Set default auto field if primary key is missing

project/settings.py

@@ -88,6 +88,8 @@ DATABASES = {
     'default': database.config()
 }
 
+# https://docs.djangoproject.com/en/3.2/releases/3.2/#customizing-type-of-auto-created-primary-keys
+DEFAULT_AUTO_FIELD = 'django.db.models.AutoField'
 
 # Password validation
 # https://docs.djangoproject.com/en/2.2/ref/settings/#auth-password-validators