Re: Is a model method the answer?

On May 26, 11:07 am, piker <da...@allnatives.com.au> wrote:
> I have a model class (A) that has a  M2M field with its relationship
> to another model (B). When I save an instance of model class (A) I
> want to automatically update a BooleanField in all the many, related
> model(B) instances at the same time. Is the right way to do this
> through a Model Method? If so, how should I reference across the M2M
> relationship? Any advice appreciated as I can't seem to find an answer
> to this specific problem.

Something like the code below (untested). If you want to update
depending on the current value of bool_field, have a look at
https://docs.djangoproject.com/en/dev/topics/db/queries/#filters-can-reference-fields-on-the-model.

class A(models.Model):
...
def save(self, *args, **kwargs):
super(A, self).save(*args, **kwargs)
self.b_set.update(bool_field=True)

Cheers, Roald

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