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2018/04/12 Otemachi.rb#5 has_one :through Shu OGAWARA (@expajp)

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35* n /$ .(@expajp) –  &' • 3!2! – Ruby/Rails210, –     -+ – )1#"%( – 6+4

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       1 1 n n        

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       1 1 n n        

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       1 1 n n          has_many :through

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       1 1 n n          has_one :through  has_many :through

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has_many :through     has_ many belongs_ to       has_ many belongs_ to

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has_one :through     has_ one belongs_ to has_ one belongs_ to  

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 Matter Contact User

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  n N+1 Query n     n  matter.main_operator  

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scope n   '   n 1"&  #   %)!(     n $

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has_one :through n  through    

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has_one :through n  through    

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has_one :through n  through " !   n conditions  -> { where(…) } #  

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 n ## $( $ % n has_one :through &%!  " n    '   $