Re: How to implement clean() for a model with ManyToMany fields?

Hi Martin,

thank you very much for your very clear and prompt help!

:-)

Best regards,
Carsten



Am 29.10.2012 20:15, schrieb Martin J. Laubach:
> Basically, you can't. M2m fields are saved after the model is saved, so
> you either get objects that are not yet ready for that check (as you
> experienced) or you will test the previous value of the m2m field,
> neither of which is what you want.
>
> You can modify the admin interface and do the validation in the
> AdminForm, or perhaps catch the m2m_changed signal and do some checks
> there, but you can't do the validation you want in the clean method.
>
> mjl


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