Rails - Aug 2006 - Frozen hash?

Hi, having this models:

class Formation < ActiveRecord::Base
  has_many :positions, :dependent => :destroy
end

class TeamFormation < Formation
  has_many :players, :through => :positions
end

class Position < ActiveRecord::Base
  belongs_to :formation
  belongs_to :player
end

I''m trying to modify position''s player attribute from a
formation:

    team.players.each do |player|
      self.positions.each do |position|
        if !self.players.include?(player) and !position.player
          position.player = player <------------ HERE I''M TRYING TO
MODIFY PLAYER
          break
        end
      end
    end

The first time I create a formation an asign those values all works
fine, but once it''s created I
can''t modify position''s player attr because
"can''t modify frozen hash"
error is raised.

How could I modify those values?, what am I doing wrong?


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