如何从Django中的子类提供基类属性的默认值？

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)

Answer 1

您可以覆盖save方法，检查是否设置了base_field，否则将其设置为默认值。