#18389: Field type attributes not permitted on models
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Reporter: john.arnfield@… | Owner: nobody
Type: Uncategorized | Status: new
Component: Database layer (models, ORM) | Version: 1.4
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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I have a situation where I need to reference a django model-field type in
my models, something that would look like the following:
{{{
from django.db import models
class MyModel(models.Model):
referenced_field = models.CharField
# ... field declarations here
}}}
The omission of parenthesis on the CharField is intentional. I do not want
to create a field on this model, I simply need to reference a field type
that this model is associated with.
Unfortunately this causes a type error:
{{{
TypeError: Error when calling the metaclass bases
unbound method contribute_to_class() must be called with AutoField
instance as first argument (got ModelBase instance instead)
}}}
This is down to ModelBase.add_to_class being overly naive in the way it
calls contribute_to_class (it uses hasattr to check for things that define
contribute_to_class, but doesn't care if they're types or objects).
One solution to this problem would be to change the class attribute in to
a classmethod, but the problem seems a little unnecessary and feels like
it should be cleaned up regardless. Unfortunately, I'm not sure what the
ideal solution would be for this case, else I'd already have submit a
patch.
--
Ticket URL: <https://code.djangoproject.com/ticket/18389>
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