How to provide a default value for base class attribute from subclass in Django?

Question

Scenario:

class BaseClass(models.Model):
    base_field = models.CharField(max_length=15, default=None)

class SubClass(BaseClass):
    # TODO set default value if base_field's value is None
    ...

ie. I need to be able to load a fixture into the database, providing a default value only if the base_field is None. Any help greatly appreciated! (note: BaseClass is not abstract)

ars · Accepted Answer · 2010-01-13 07:37:59Z

3

You could override the save method, check if base_field is set, otherwise set it to the default value.

answered Jan 13, 2010 at 7:37

ars

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1 Comment

mkelley33 Over a year ago

yeah, that's the path I didn't want to take, but it works so yay. i was hoping for something more like a constructor new or init, but I don't fully understand the way those work yet so I think I'll go with your suggestion. thank you!

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