How can I add an attribute to each option in a django model form containing a foreign key?

[Jonathan Dan]

Hello,

I have two models:

     class Currency(models.Model):
        ...
        available = models.BooleanField()

     class Offer(models.Model):
        ...
        currency = models.ForeignKey('Currency')

I make a form from the Offer model:

     class OfferForm(ModelForm):
        class Meta:
           model = Offer

How can I add an attribute tag with the value `currency.available` to
each `<option>` from the `<select>` `Currency` widget?

(I am also open to solutions using external apps (like
django-crispy-forms))

(This question has also been asked on stackoverflow:
http://stackoverflow.com/q/27474719/1011154 )

Best regards
Jonathan Dan

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