Help with passing data between scaffolds

A hidden field on the new form with the album_id should work. Start
by viewing the source of the form. Is the hidden field present and
does it have the correct value? If that looks ok, then review your
controller create action and finally your model to determine a what
point the album_id is being removed.

On a side note unrelated to your problem your photo controller index
action could be changed to this:

@photos =,
  :per_page => 9,
  :page => params[:page])

(Assuming album has_many photos in your model)