Hi, I am writing a custom form field that takes a Model object and a
field name as arguments. I want to ensure in __init__ that the given
Model has a field with this name. The code looks like this:
def __init__(self, model, field_name, separator = ' ', *args,
**kwargs):
self.model = model
self.field_name = field_name
try:
field_attribute = getattr(self.model, self.field_name)
except AttributeError:
raise ValidationError(self.error_messages
['invalid_field_name'] % (self.model, self.field_name) )
The problem is that attributes of db.Models.fields.Field type don't
get added to the __dict__ of class they are defined in, so getattr
will always fail. I have found this is due to a special way Fields
register themselves (via contribute_to_class method).
So what is the Django way to check that a Model has a Field with given
name?
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