Rails (ActiveRecord) で scope と joins する方法 - Qiita

class CreateAuthors < ActiveRecord::Migration def change create_table :authors do |t| t.string :name t.timestamps end end end class CreateBooks < ActiveRecord::Migration def change create_table :books do |t| t.integer :author_id t.string :title t.datetime :published_at t.timestamps end end end

[akatakun]

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