How to override the default value of a Model Field from an Abstract Base Class

0 votes

I've got some code that looks like this:

class BaseMessage(models.Model):
    is_public = models.BooleanField(default=False)
    # some more fields...

    class Meta:
        abstract = True

class Message(BaseMessage):
    # some fields...

and I'd like to override the default value of the is_public field in the Message model so that it's True for that model.

I've looked through some relevant Django docs and poked around the model objects but I'm having trouble finding the right place to do this. Any suggestions?

Jun 30, 2020 in Python by kartik
• 37,510 points
2,680 views

1 answer to this question.

0 votes

Hello @kartik,

You can do this as follows:

class BaseMessage(models.Model):
    is_public = models.BooleanField(default=False)
    # some more fields...

    class Meta:
        abstract = True

class Message(BaseMessage):
    # some fields...
Message._meta.get_field('is_public').default = True

It works, because the field on Message is a different instance than the field on BaseMessage. However,It depends a lot on how django internals currently work.

Hope it helps!!

Thank You!!

answered Jun 30, 2020 by Niroj
• 82,880 points

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