Django models choices

[Amine Yaiche]

Hi everyone,

Given a field in a model that uses choices:

CHOICES = (
    (0, "choice_0"),
    (1, "choice_1")
)

foo = models.IntegerField(choices=CHOICES)

If i put a value other than 0 or 1, django will accept it. Is that possible that we instruct Django to accept only values that are mentioned in CHOICES without creating a validator function.

[Amandeep Singh]

The choices don't enforce any default validation. But if you are populating the data from a http call then use ModelForm they show the invalid_choice error message on entering value other than defined choices

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[Mike Dewhirst]

On 21/03/2016 7:29 PM, Amine Yaiche wrote:
> Hi everyone,
>
> Given a field in a model that uses choices:
>
> |
> CHOICES =(

> Â Â (0,"choice_0"),
> Â Â (1,"choice_1")

> )
>
> foo =models.IntegerField(choices=CHOICES)
> |
>
>
> If i put a value other than 0 or 1, django will accept it. Is that
> possible that we instruct Django to accept only values that are
> mentioned in CHOICES without creating a validator function.

Why don't you want to validate in the model?

I find it valuable to put all sorts of validators in the clean() method
and raise a ValidationError to force the user to enter good data. eg.,

if self.foo not in CHOICES:
raise ValidationError("bad foo")

Unless there are special reasons otherwise, I think it is much better in
the model than the form.

Mike

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