def display_fields / form_fields do not cover detach

[FLX-0x00]

If you declare display_fields' and form_fields' like this

def display_fields
 field :title as: :text
 field :users as: :has_and_belongs_to_many
end

def form_fields
 field :title, as: :text
 field :users as: :has_and_belongs_to_many
end

You cannot detach a user resource because you get the error: use_resource for NIL class. This may be because the DELETE request for the association does not have the field. To "fix" this, you need to declare the "fields" method only with the association, such as

def fields
 field :users as: :has_and_belongs_to_many
end

With the "fields" method, the detach will work. You may need to check that a detach is also covered in "form_fields" so that you do not have to declare the "fields" method just for the detach. We are trying to make the code cleaner and easier to read by separating the different views into the corresponding field methods. It would be nice to not have the "fields" method for some resources and use the form/display fields completely.