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    # Settingslogic * [GitHub \- binarylogic/settingslogic: A simple and straightforward settings solution that uses an ERB enabled YAML file and a singleton design pattern\.](https://github.com/binarylogic/settingslogic) * [Settingslogicコードリーディング](https://blog.freedom-man.com/settingslogic-codereading/) + [この冬はじめよう\! 5分で理解するGemのコードリーディング\(1\) settingslogic \- Qiita](https://qiita.com/tjnet/items/58fe4fa596cd8c0cf6da) ## risacan :v: * 1ページしかないやんけ! * [settingslogic/settingslogic\.rb at master · binarylogic/settingslogic · GitHub](https://github.com/binarylogic/settingslogic/blob/master/lib/settingslogic.rb) * メタプロRuby読んでたから読めるところふえてる * forkして、-can つけないと呼び出せないようにしてみる * もちろんkeyには絵文字使える :revolving_hearts: * bundle init * Gemfileに `gem "settingslogic"` * bundle console ``` require "./settings" Settings.utapri.masato #=> "blue" ``` * `metthod_missing` ## katorie :baby: :woman: * https://github.com/binarylogic/settingslogic/blob/master/lib/settingslogic.rb から読む * instance.send なんだっけ ## しおい :egg: - yamlファイルに記述されている内容を、OOP的に呼び出せるgem と理解 - @sourceに読込先のファイルを渡す - 前提:SettingsLogicクラスはHashクラスを継承している(=keyに対してfetchでvalueを返せる) ```ruby Settings.language.haskell.paradigm # Settingsクラスにはlanguageというメソッドもhaskellメソッドもparadiamメソッドもない # => method_missingが呼びだされる def method_missing instance.send end def instance # @instanceに値を代入するためにselfをnewする end def initialize   # インスタンスの中身を@sourceの中身に置き換える   # create_accessors!を呼ぶ end def create_accessors! # create_accessor_forを呼ぶ keyに入っているのはyamlファイルの頭のの項目 end def create_accessors_for # 引数で渡されたkeyを見て、インスタンス変数を定義 # keyが更にネストされた値の場合はself.class.newする # => これを自分(SettingsLogicクラス)にclass_evalで定義する # keyが存在しない場合はmissing_keyを呼び出す # ここまできたらinstanceに戻ってsend => これはインスタンスメソッドの方のmethod_missingを呼ぶ end def (インスタンスメソッドの方)method_missing # fetchメソッドでkeyに対するvalueを返す # さらにネストしている場合は再帰的にnew end ``` ## hayashi :raised_hands: * 読めない。。。。 ## pan :bread: - 1ファイル。やる気出てきた ### 強い人達から教わった、最初に読むGemのおすすめと読み方 - 柴田さん:Railsかそれ以外を読むかによるが、RailsのGemを読むにはまずRailtieを理解すると良いとのこと - Railtieを理解するためにはRailsプラグインを作る - https://qiita.com/kidach1/items/565c2c077ae8d15fe3a8 - 松田さん:おすすめは、コミットログを最初から読むこと→そこがちゃんとできてないGemはつかいたくないとのこと、、 - 初期のActiveRecord(1ファイル?) ### コードリーディングの進め方 - こっちのページにはデバッグのやり方が書いてあったhttps://blog.freedom-man.com/settingslogic-codereading/ - `bundle console` の存在を知った!→ローカルにインストールしたGemを読み込みたいときはこれを使う。irbはグローバルにインストールしたGemしか使えない(`Rails console` しか知らなかった…) - しおいさんの説明によりふわっとわかった… - hashを継承しているので `self.replace` が呼べる - hashを継承しているのでそれをオーバーライドするメソッドが色々用意されている - https://github.com/binarylogic/settingslogic/commit/471adcb09c8ff303a2f024489480ba3573b20024 このあたりのコミットを見ると、今より簡単なロジックが書かれているので理解しやすいかもしれない。

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