ManyToManyField limit choices to dynamic foreign model

Question

class TrialRun(models.Model):
    product = models.ForeignKey(NewProduct, verbose_name='Product',)

class Component(models.Model):
    product = models.ForeignKey(NewProduct, verbose_name='Product',)

class TrialIssue(models.Model):
    trialrun = models.ForeignKey(TrialRun, verbose_name='Trial Run',)
    components = models.ManyToManyField(
        Component,limit_choices_to{product=trialrun.product})

How could I realize the thinking of (Component, limit_choices_to={product=trialrun.product})?

i can not use the following

def __init__(self, *args, **kwargs):
    super(TrialIssueForm, self).__init__(*args, **kwargs)
    # make sure we're editing a saved model
    if self.instance.id:
        self.fields['components'].queryset = Component.objects.filter(product=self.instance.trialrun.product)

score 0 · Answer 1 · edited May 23 '17 at 12:19

0

There is no way to define it on the database level, so you need to do this inside a form. There is an example on Creating a dynamic choice field for a ForeignKey field, but it should be able to change it to work with ManyToManyFields as well.

If you also want it checked inside the model, you have to add your own custom validator as described here: https://docs.djangoproject.com/en/1.6/ref/models/instances/#validating-objects

edited May 23 '17 at 12:19

Community

1
1

answered Dec 15 '13 at 15:56

mawimawi

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hi, i use the one in my question, but no effect – user687673 Dec 15 '13 at 16:09
hi, i can not find a way for the manytomanyfield, couldyou help more clearly? – user687673 Dec 15 '13 at 16:18
it is also very like the unresoved question at stackoverflow.com/questions/19726274/django-models-limit-manytomanyfield-to-owner – user687673 Dec 15 '13 at 16:20

ManyToManyField limit choices to dynamic foreign model

1 Answers1