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joinsで結合したモデルのscopeを使ってデータを取得する方法

Last updated at Posted at 2020-01-24

inner joinかつ別モデルのscopeを利用してそのモデルの状態を条件にデータを取得したい。
例えば、「紐づくuserのstatusがtrueであるtweet」を取得したいときは以下のように書ける。

Tweet.joins(:user).merge(User.available)

user.rb

class User < ApplicationRecord
  has_many :tweets
  scope :available, -> {
    where(status: true)
  }
end

tweet.rb

class Tweet < ApplicationRecord
  belongs_to :user
end
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