Rails: has_many vs has_one

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  • 1. has_many vs has_one 2010/10/02 Shouichi KAMIYA
  • 2. Given class App ActiveRecord::Base has_many :servers end class Server ActiveRecord::Base belongs_to :app end
  • 3. Then irb> app = App.new irb > app.servers = [Server.new] irb > app.servers #=> [#<Server:0x101141d68>]
  • 4. Looking good.
  • 5. Given class App ActiveRecord::Base has_one :server end class Server ActiveRecord::Base belongs_to :app end
  • 6. Then irb> app = App.new irb > app.server = Server.new irb > app.server #=> nil
  • 7. What!?
  • 8. The correct way irb> app = App.new irb > app.set_server_target = Server.new irb > app.server #=> #<Server:0x101141d68>
  • 9. WTF... Thanks!