Extending Registration Page with ModelMultipleChoiceField

Hello. I am new to openedx tutor and I am trying to extend the registration page. I have created a custom django form.

This is a sample of my form.

class ExtraFieldForm(forms.ModelForm):
     streams = forms.ModelMultipleChoiceField(

    class Meta:
        model = UserProfile
        fields = (
        labels = {
            'streams': _("Streams"),
        help_text = {
            'Streams': _("Please select your Streams"),

    def __init__(self, *args, **kwargs):
        super(ExtraFieldForm, self).__init__(*args, **kwargs)
        self.fields['streams'].required = True

If I remove the streams from fields, the form is being rendered for the normal Fields (CharField, IntegerField). However, I am unable to render the streams field as a multiple select field.

Field Type Mapping line 187

There is this mapping which only has certain mappings.

        forms.CharField: "text",
        forms.PasswordInput: "password",
        forms.ChoiceField: "select",
        forms.TypedChoiceField: "select",
        forms.Textarea: "textarea",
        forms.BooleanField: "checkbox",
        forms.EmailField: "email",

How can I implement the multiple select field in Tutor Nutmeg? Any help will be appreciated. Thanks

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