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This follows this prior question, which was answered. I actually discovered I could remove a join from that query, so now the working query is start_cards = DeckCard.find :all, :joins => [:card], :conditions => ["deck_cards.deck_id = ? and cards.start_card = ?", @game.deck.id, true] This appears to work. However, when I try to move these DeckCards into another association, I get the ActiveRecord::ReadOnlyRecord error. Here's the code for player in @game.players player.tableau = Tableau.new start_card = start_cards.pop start_card.draw_pile = false player.tableau.deck_cards << start_card # the error occurs on this line end and the relevant Models (tableau are the players cards on the table) class Player < ActiveRecord::Base belongs_to :game belongs_to :user has_one :hand has_one :tableau end class Tableau < ActiveRecord::Base belongs_to :player has_many :deck_cards end class DeckCard < ActiveRecord::Base belongs_to :card belongs_to :deck end I am doing a similar action just after this code, adding DeckCards to the players hand, and that code is working fine. I wondered if I needed belongs_to :tableau in the DeckCard Model, but it works fine for the adding to player's hand. I do have a tableau_id and hand_id columns in the DeckCard table. I looked up ReadOnlyRecord in the rails api, and it doesn't say much beyond the description.

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