How do I make a model formset based on another model

I currently have two Django Models, on it like a setup model and another is the actual data for that model. Like this:

class Extra(models.Model):
    has_text = models.BooleanField(u'Has Text', default=False)
    has_image = models.BooleanField(u'Has Image', default=False)
    has_file = models.BooleanField(u'Has File', default=False)


class OrderExtra(models.Model):
    extra = models.ForeignKey('Extra')
    image = models.ImageField(upload_to=get_order_extra_upload_path, blank=True, null=True)
    file = models.FileField(upload_to=get_order_extra_upload_path, blank=True, null=True)
    text = models.TextField(blank=True, null=True)
    comments = models.TextField(blank=True, null=True)

I've been trying to make a formset of the OrderExtra that is linked up to a queryset of the Extra that I've filtered out. Then hide the fields of the unchecked boxes of the Extra.

I though about making a form for the Extra and replacing the fields on creation, but I wasn't sure how to do this properly...

If anyone could help me, or provide some direction that would be fantastic, because I'm stuck on how to d开发者_JAVA百科o this...

Cheers.

Try to make form for OrderExtra and in init of it add checked fields from related extra object

class MyForm(forms.ModelForm):
    has_text = None

    class Meta():
        model=OrderExtra

    def __init__(self, *args , **kwargs):
        super(MyForm, self).__init__(*args , **kwargs)
        if self.instance and self.instance.extra.has_text:
            self.has_text = forms.BooleanField(...)

You can do this also for has_image and has_file