Rails - Jun 2008 - add validation error from associated model to parent

so basically i has this setup (example):

class FellowUser < ActiveRecord::Base
  belongs_to :fellow
  belongs_to :user
end

class Fellows < ActiveRecord::Base
  belongs_to :user
  has_many :fellow_users
  has_many :fellows, :through => :fellow_users
end

what i want, in rspec terms, is this:


  #
  # i want validation to fire if i associate user twice to fellow
  #
  it "should not be able to be fellow twice" do
    @fellow.fellows << users(:george)
    @fellow.fellows << users(:quentin)
    @ft.fellows.size.should == 2

    # same user second time
    @fellow.fellows << users(:george)


    # tried @fellow.should_not be_valid - not working either
    @fellow.should have(1).error_on(:fellows)

    @fellow.fellows.size.should == 2
  end

  in join model:

  i tried this with no luck:
     validates_uniqueness_of :fellow_id, :scope =>  :user_id

  i tried this with same result:
     validate do |record|
       # add_to_base, can be add(:fellows, --//--) and no luck here
       record.errors.add_to_base("duplicating hitcher") if
record.fellow.fellows.size!=record.fellow.fellows.uniq.size
     end

  in parent model:

    this makes model not valid but it still saves and record is add to
join model

       validate do |record|
         record.errors.add(:fellows, "you can''t be fellow
twice") if
record.fellows.size!=record.fellows.uniq.size
       end


Any suggestions will be greatly appreciated.
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