demarches-normaliennes/db/migrate/20160317144949_piece_justificative_have_user.rb

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class PieceJustificativeHaveUser < ActiveRecord::Migration
class PieceJustificative < ActiveRecord::Base
belongs_to :dossier
end
class Dossier < ActiveRecord::Base
belongs_to :user
end
class User < ActiveRecord::Base
end
def change
add_reference :pieces_justificatives, :user, references: :users
PieceJustificative.all.each do |piece_justificative|
piece_justificative.user_id = piece_justificative.dossier.user.id
piece_justificative.save
end
end
end