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ポリモーフィックを実装する

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ポリモーフィックの実装の説明しているサイトは色々あるけれどrails g modelコマンドを使って説明しているサイトがないのでメモ

モデルを作成する

子モデルを作成

$ rails g model children_one children_one_name:string
$ rails g model children_two children_two_name:string

親モデルを作成

$ rails g model parent parentable:references{polymorphic}:index name:string

generate

$ rake db:migrate

リレーションを作成

# 子クラス
class ChildrenOne < ActiveRecord::Base
  # 追加
  has_many :parents, :as => :parentable
end

# 子クラス
class ChildrenOne < ActiveRecord::Base
  # 追加
  has_many :parents, :as => :parentable
end

# 親クラス
class Parent < ActiveRecord::Base
  belongs_to :parentable, polymorphic: true
end

親クラスから子クラスを参照

# 親クラスに紐づく子クラスChildrenOneかChildrenTwoが参照される
Parent.first.parentable
kkyouhei
アドネットワークとかアプリとかEC
basicinc
マーケティングとテクノロジーで社会のあらゆる問題を解決する集団
https://tech.basicinc.jp/
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