【2018/04/12 Otemachi.rb#5】has_one :throughの憂鬱

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

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

1 1 n
n

1 1 n
n has_many :through

1 1 n
n has_one :through has_many :through

has_many :through has_ many belongs_ to
has_ many belongs_ to

has_one :through has_ one belongs_ to
has_ one belongs_ to

Matter Contact User

n N+1 Query n
n matter.main_operator

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

has_one :through n through

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

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

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