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

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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