Deprecated NullBooleanField

NullBooleanField is deprecated and will be removed a future version of Django.

NullBooleanField is like BooleanField with null=True.

Historically the only values BooleanField accepted was True and False. BooleanField didn't permit null=True. If null was a valid value then NullBooleanField was used instead.

So in practice, do this

class SomeModel(models.Model):
    some_field = models.BooleanField(null=True)

Instead of this

class SomeModel(models.Model):
    some_field = models.NullBooleanField()

Are you affected by this? Audit your codebase in seconds to find out.

Configuring this check

Django Doctor will run this check by default. No configuration is needed but the check can be turned on/off using check code deprecated-nullboolean-field in your pyproject.toml file.

Read more about configuring Django Doctor.