#30857: When subclassing a model field, `max_length` cannot be passed as an
argument to `self.__init__`
-------------------------------------+-------------------------------------
Reporter: Robin | Owner: nobody
(Robert) Thomas |
Type: | Status: new
Uncategorized |
Component: | Version: 2.2
Uncategorized |
Severity: Normal | Keywords: models fields
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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{{{
class MyCustomField(models.CharField):
def __init__(self, *args, **kwargs):
super().__init__(max_length=60, *args, **kwargs)
class MyModel(models.Model)
address_state = MyCustomField()
}}}
On attempting to migrate, I get:
{{{
super().__init__(max_length=60, *args, **kwargs)
TypeError: __init__() got multiple values for keyword argument
'max_length'
}}}
Using `kwargs[max_length]` works just fine. However, the documentation
says that `max_length` should be able to be passed to `super().__init__()`
as an argument:
https://docs.djangoproject.com/en/2.2/howto/custom-model-fields/#writing-a
-field-subclass
Either the documentation is incorrect and should be fixed, or this is a
bug.
--
Ticket URL: <https://code.djangoproject.com/ticket/30857>
Django <https://code.djangoproject.com/>
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