TheCorrespondingSquares/chess-app

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db/migrate/20170529093515_add_reference_to_white_player.rb

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class AddReferenceToWhitePlayer < ActiveRecord::Migration[5.0]
  def change
      add_reference :games, :white_player, references: :users, index: true
      add_foreign_key :games, :users, column: :white_player_id
  end
end