[Ncr-Python.in] why does to_python gets called twice in this code ?

[ragsagar]

On Wed, Jan 9, 2013 at 4:07 PM, Vijay Shanker <deontics at gmail.com> wrote:

> i rephrased the question.thanks for the help extended so far.
>
> http://stackoverflow.com/questions/14214530/issues-in-example-custom-field-inheriting-foreignkey
>

Mention what you are trying to achieve when you ask a question. Otherwise
how somebody can help you? Seeing your implementation I don't get any idea
what you are trying to do. It doesn't look like something that requires a
custom ModelField. Anyway the i guess the reason that it is getting called
twice is, you have __metaclass__ django.db.models.SubFieldBase
which will call to_python() every time you try to set an attribute in a
class which is created by metaclass SubFieldBase. In the course of
execution some where as part of validation it is trying to access the
'editor_id' which will give an AttributeError, followed by a setattr on
that ProfiledUserField in turn to_python gets called with a None value. I
didn't investigate much so my guess might be wrong. Try using a pdb and
follow the path.

PS: If you are mentioning what you want to achieve, there may be better
solutions than writing custom Model Field.


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