Django MultiValueField - How to pass choices to ChoiceField?

Question

I have a multivaluefield with a charfield and choicefield. I need to pass choices to the choicefield constructor, however when I try to pass it into my custom multivaluefield I get an error __init__() got an unexpected keyword argument 'choices'.

I know the rest of the code works because when I remove the choices keyword argument from __init__ and super, the multivaluefield displays correctly but without any choices.

This is how I setup my custom multivaluefield:

class InputAndChoice(object):
    def __init__(self, text_val='', choice_val=''):
        self.text_val=text_val
        self.choice_val=choice_val

class InputAndChoiceWidget(widgets.MultiWidget):
    def __init__(self, attrs=None):
        widget = (widgets.TextInput(),
                  widgets.Select()
                 )
        super(InputAndChoiceWidget, self).__init__(widget, attrs=attrs)

    def decompress(self,value):
        if value:
            return [value.text_val, value.choice_val]
        return [None, None]


class InputAndChoiceField(forms.MultiValueField):
    widget = InputAndChoiceWidget

    def __init__(self, required=True, widget=None, label=None, initial=None,
                 help_text=None, choices=None):
        field = (
                 fields.CharField(),
                 fields.ChoiceField(choices=choices),
                 )
        super(InputAndChoiceField, self).__init__(fields=field, widget=widget, 
              label=label, initial=initial, help_text=help_text, choices=choices)

And I call it like so:

input_and_choice = InputAndChoiceField(choices=[(1,'first'),(2,'second')])

So how do I pass the choices to my ChoiceField field?

Edit:

I've tried stefanw's suggestion but still no luck. I've used logging.debug to print out the contents of InputAndChoiceField at the end of the init and self.fields[1].choices contains the correct values as per above however it doesnt display any choices in the browser.

Answer 1

I ran into this exact same problem and solved it like this:

class InputAndChoiceWidget(widgets.MultiWidget):
    def __init__(self,*args,**kwargs):
        myChoices = kwargs.pop("choices")
        widgets = (
            widgets.TextInput(),
            widgets.Select(choices=myChoices)
        )
        super(InputAndChoiceWidget, self).__init__(widgets,*args,**kwargs)

class InputAndChoiceField(forms.MultiValueField):
    widget = InputAndChoiceWidget

    def __init__(self,*args,**kwargs):
        # you could also use some fn to return the choices;
        # the point is, they get set dynamically 
        myChoices = kwargs.pop("choices",[("default","default choice")])
        fields = (
            fields.CharField(),
            fields.ChoiceField(choices=myChoices),
        )
        super(InputAndChoiceField,self).__init__(fields,*args,**kwargs)
        # here's where the choices get set:
        self.widget = InputAndChoiceWidget(choices=myChoices)

Add a "choices" kwarg to the widget's constructor. Then explicitly call the constructor after the field is created.