python - ManyToManyField aren't available in the post_save signal -


i need manipulate data django model after saving, need access manytomanyfield.

here's want do:

class lab(model):   institute = manytomanyfield(institute)  def post_save_lab(sender, instance, created, *args, **kwargs):   if not instance.institute.all():     # data processing...  post_save.connect(post_save_lab, sender=lab)

the problem is, instance.institute.all() empty @ moment... how can know if lab has or has not institute?

i specify signal m2m_changed doesn't solve problem because data processing must done if there no elements in manytomany relation. therefor m2m_changed not called.

thanks!

the m2m cannot saved until model instance saved. if looking m2m instances when object created created==true in post save signal empty.

i think can have handler m2m_changed signal.


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