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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 ' $