two suggestions:
1. set a debugger at the beginning of you show-method. that way you
will find the reason for @photo being nil.
2. since Photo.id is your primary key (and therefore unique) you could
just do your find like this:
  @photo = Photo.find(params[:id])
instead of the much longer:
  @photo = Photo.find_by_user_id_and_id(params[:user_id], params
[:id], :include => :user)
as long as id distinctly identifies the record the user_id doesn't
matter.

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