Description

In the case where your habtm doesn't have the unique option set to true one I think the following should be allowed:

class Contestant < ActiveRecord::Base

has_and_belongs_to_many :kills

end

class Score < ActiveRecord::Base

has_and_belongs_to_many :contestants

end

scores.yaml

mario_score:

kills: marth_contestant, marth_contestant, samus_contestant

I would assume should load

scores(:mario_score).kills = [ Marth, Marth, Samus ]

instead all duplicates are removed.

I've included a patch to fix this behavior