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ActiveRecord inverse_ofの使い所

Posted at

Rubocopの違反(RuboCop::Cop::Rails::InverseOf)が発生したので、inverse_ofについて調べてみました。

普通の関連付けではinverse_ofを使用しなくても、自動的に追えるようになっているので特に設定は必要ありません。

model.rb
class Parent < ApplicationRecord
  has_many :children
end

class Child < ApplicationRecord
  belongs_to :parent
end

しかし、関連付けでscopeをつける場合はinverse_ofを使用しなければいけません。以下のようにinverse_ofを設定してあげると逆関連づけを指定できます。

model.rb
class Parent < ApplicationRecord
  has_many :children -> { order(:height) }, inverse_of: :parent
end

class Child < ApplicationRecord
  belongs_to :parent, inverse_of: :children
end

参考にした記事のurl

Railsガイド inverse_of
https://railsguides.jp/association_basics.html#belongs-to%E3%81%AE%E3%82%AA%E3%83%97%E3%82%B7%E3%83%A7%E3%83%B3-inverse-of

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