Hide a field from a django modelform

If you don't intend on the address_id field to be edited at all in the form, you should use the exclude meta field as documented in Using a subset of fields in the form.

The result should look like:

class PharmForm(ModelForm):
    class Meta:
        model = PharmInfo
        exclude = ('address_id',)

Note that this will prevent the address_id field from being set through the form (check the note under the example in the docs).