Form hidden filed for foreign key - validation error

I want to have foreign key in form displayed as hidden field. I will
be using javascript to populate this field.

Model is defined as:

contactid = models.ForeignKey(Contact, blank = True, null = True,
on_delete = models.PROTECT)

I tried to define form field as:

contactid = ModelChoiceField(queryset=Contact.objects.all(),
widget=HiddenInput())

but I then get validation error (This field is required.).

Is there way to display foreign key form field as input (hidden)?

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