Remove “add another” in Django admin screen

Question

Whenever I\'m editing object A with a foreign key to object B, a plus option \"add another\" is available next to the choices of object B. How do I remove that option?

Answer 1

Look at django.contrib.admin.options.py and check out the BaseModelAdmin class, formfield_for_dbfield method.

You will see this:

# For non-raw_id fields, wrap the widget with a wrapper that adds
# extra HTML -- the "add other" interface -- to the end of the
# rendered output. formfield can be None if it came from a
# OneToOneField with parent_link=True or a M2M intermediary.
if formfield and db_field.name not in self.raw_id_fields:
    formfield.widget = widgets.RelatedFieldWidgetWrapper(formfield.widget, db_field.rel, self.admin_site)

I think your best bet is create subclass of ModelAdmin (which in turn is a subclass of BaseModelAdmin), base your model on that new class, override formfield_fo_dbfield and make it so that it won't/or will conditionally wrap the widget in RelatedFieldWidgetWrapper.

One could argue that if you have a user that doesn't have rights to adding related objects, the RelatedFieldWidgetWrapper should not display the add link? Maybe this is something that is deserving of mention in Django trac?