CODEWITHSUNDEEP
djangoforms
porton
porton

Reputation: 5815

Django: limit_choices_to with with a "through" intermediate table

https://docs.djangoproject.com/en/1.10/ref/models/fields/:
"limit_choices_to has no effect when used on a ManyToManyField with a custom intermediate table specified using the through parameter."

Why?! And what to do if I need both through and limit_choices_to?

Should I fall back from ModelForm to simple Form in this situation and do it all manually? Or is there a way to do it with ModelForm?

Upvotes: 1

Views: 297

Answers (1)

xyres
xyres

Reputation: 21834

I tested limit_choices_to with a through ManyToManyField. And surprisingly it works, despite the docs say it doesn't.

Still, if it's not working for you, you can set a custom queryset for the ManyToMany field in your ModelForm.

# models
class YourModel(models.Model):
    some_attr = models.BooleanField()

class MyModel(models.Model):
    my_field = models.ManyToManyField(YourModel, through=...)


# forms
class MyModelForm(forms.ModelForm):
    ...
    my_field = forms.ModelMultipleChoiceField(queryset=YourModel.objects.filter(some_attr=True))

Upvotes: 2

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