How do I get dynamic choices to a select widget at render time?

[Mike Dewhirst]

Here is an example of get_choices() output ... it comes from a method on
the Question model.

 [('A', 'A - Once?'), ('B', 'B - Twice?'), ('C', 'C - Four times?'),
('D', 'D - Twelve times?'), ('E', 'E - Continously as changes are made?')]

It is available before the the answer form is instantiated ...

class AnswerSingleForm(forms.ModelForm):

    class Meta:
        model = Answer
        fields = [
            'answer',
            'score'
        ]

So how do I get that set of choices into the Answer form?

I can see from the docs that the form Meta class can have a widgets
attribute for the 'answer' field. I think I need a ChoiceField widget so
I can include the choices. I tried using __init__() in the form class to
get the choices on board at instantiation but still couldn't get it
going because class Meta doesn't see 'self'.

Thanks for any help

Stumped

[Mike Dewhirst]

On 20/02/2018 11:16 AM, Mike Dewhirst wrote:
> Here is an example of get_choices() output ... it comes from a method
> on the Question model.
>
>  [('A', 'A - Once?'), ('B', 'B - Twice?'), ('C', 'C - Four times?'),
> ('D', 'D - Twelve times?'), ('E', 'E - Continously as changes are
> made?')]
>
> It is available before the the answer form is instantiated ...
>
> class AnswerSingleForm(forms.ModelForm):
>
>     class Meta:
>         model = Answer
>         fields = [
>             'answer',
>             'score'
>         ]
>

This is my new form which seems to work ...

class AnswerSingleForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):

        super(AnswerSingleForm, self).__init__(*args, **kwargs)

        answer = kwargs['instance']

        choices = answer.question.get_choices()

        if len(choices) > 0:

            self.fields['answer'] = forms.ChoiceField(

                choices=choices

            )

[Andy]

use django-select2

[Mike Dewhirst]

On 20/02/2018 11:51 PM, Andy wrote:
> use django-select2

Had a look at the docs and django-select2 doesn't address this use case.
However, I can see I will need it for ORM related selections in the near
term.

Thanks Andy.

> --
> You received this message because you are subscribed to the Google
> Groups "Django users" group.
> To unsubscribe from this group and stop receiving emails from it, send
> an email to django-users...@googlegroups.com
> <mailto:django-users...@googlegroups.com>.
> To post to this group, send email to django...@googlegroups.com
> <mailto:django...@googlegroups.com>.
> Visit this group at https://groups.google.com/group/django-users.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/django-users/4eaf732e-54c5-4e43-ba6e-8ef72c999c90%40googlegroups.com
> <https://groups.google.com/d/msgid/django-users/4eaf732e-54c5-4e43-ba6e-8ef72c999c90%40googlegroups.com?utm_medium=email&utm_source=footer>.
> For more options, visit https://groups.google.com/d/optout.