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    # 本日の流れ * 自己紹介 * 本編 * [sanoさんのLT](https://ttwo32.github.io/paperclip_lt/reveal.js/#/) * LT後議論 * 次回のテーマリクエスト・感想等(あれば) # 参加者のお名前(時計回り) * ebi(主催者) * Ueharaさん edutech * Takahashiさん 決済系 * sinsokuさん * toruちゃんさん 動画配信 * sanoさん(スタッフ) # 画像回りについて ## 画像周りのgem ### carrierwave * carrierwaveで、gem fogじゃなくて gem fog-awsとする方法 gem fogと記載すると(当たり前だけど)ライブラリ全体を読み込んでしまう。そこで ``` gem 'fog', require: "fog/aws" gem "carrierwave" ``` のように書くのだが、`gem 'fog', require: "fog/aws"`ではなく`gem fog-aws`と書いた方がそもそも全部インストールしないので 良いと思うけど、carrierwaveのconfigの書き方など変わらないのだろうか。 →[ドキュメントに書いてあった](https://github.com/carrierwaveuploader/carrierwave#using-amazon-s3) ### Paperclip * LT => お題「[Try Paperclip!!](https://ttwo32.github.io/paperclip_lt/reveal.js/#/)」 by [@ttwo32](https://twitter.com/ttwo32) * DBでテーブルを直で見ると画像URLわからないで困ったことないですか?良い方法ありますか? → 以下のファイルを参照すると、`@default_options`のurlや、`#url`でgenerateしているので、DBには保存していないため、DBからは取得できないようです。以下の方法で、urlを取得できるので、試してみてください。 * このファイルが参考になるかもです! https://github.com/thoughtbot/paperclip/blob/7edb35a2a9a80c9598dfde235c7e593c023fc914/lib/paperclip/attachment.rb * URLgenerater https://github.com/thoughtbot/paperclip/blob/7edb35a2a9a80c9598dfde235c7e593c023fc914/lib/paperclip/url_generator.rb ~~~~ MacBook-Pro:pictures ssssss$ rails c Running via Spring preloader in process 1552 Loading development environment (Rails 5.0.1) Frame number: 0/20 [1] pry(main)> u = User.first User Load (0.2ms) SELECT "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT ? [["LIMIT", 1]] => #<User:0x007fe6270b8a78 id: 2, name: "test", password: "aaaaaa", created_at: Mon, 30 Jan 2017 10:45:51 UTC +00:00, updated_at: Mon, 30 Jan 2017 10:45:51 UTC +00:00, avatar_file_name: "06_-_1.jpg", avatar_content_type: "image/jpeg", avatar_file_size: 49083, avatar_updated_at: Mon, 30 Jan 2017 10:45:51 UTC +00:00> [2] pry(main)> u.avatar.url => "/system/users/avatars/000/000/002/original/5d38119fbab8f4a2648c5b5a30832e24b965f598.jpg?1485773151" [3] pry(main)> u.avatar.default_url NoMethodError: undefined method `default_url' for #<Paperclip::Attachment:0x007fe62254da70> Did you mean? default_style from (pry):3:in `<main>' [4] pry(main)> u.avatar.url => "/system/users/avatars/000/000/002/original/5d38119fbab8f4a2648c5b5a30832e24b965f598.jpg?1485773151" [5] pry(main)> ~~~~ * 後からクリッピングサイズを追加すると、元から登録されてた画像には適用されない(?)ですが良い方法ありますか? * carrierwaveでは、`#recreate versions`というメソッドがあり、後から既存の画像ファイルをリサイズできる * バッチで対処 * save(touch: false)で、updated_atが更新されずにsaveできる ## 画像処理 ### ImageMagick * リサイズ以外に何ができるの?(これは便利とか注意点とかあれば知りたい) [こちらがドキュメント](http://www.imagemagick.org/script/index.php) CSSで何とかなる http://www.bokukoko.info/entry/2016/03/28/JavaScript_で画像をリサイズする方法 ## ストレージ ### Fog * (aws-sdkと比較した)fog-awsの利点を知りたい fog-awsはテストフレームワークが[shindo](https://github.com/geemus/shindo)(minitestとかrspecじゃない) aws-sdkはapiラッパークラス(Aws::S3::Client等)と抽象化されたクラス(a higher-level abstraction for working with AWS resources) があるそう。 前者はBaseクラスを継承していて、後者はResourceやBaseを継承しているという違いがある(?)。 後者のお蔭で、SQSの[long polling](http://docs.aws.amazon.com/sdkforruby/api/Aws/SQS/QueuePoller.html)など、便利な機能が使えるようになる。 fog-awsはapiラッパーのみで使える機能が限られている(long pollingなど)。 * s3でファイルアップロードするときにテストってどう書いている? unitテストでは外部通信をやらない stubで正常系のjsonが返ってくるのをチェックする web通信をmockするgemがある([こちら](https://github.com/bblimke/webmock)) [VCR](https://github.com/vcr/vcr)便利(apiを叩いて返ってきたjsonをファイルに保存する。2回目はそのファイルを見る) それでも通信の確認をしたい時は結合テストで、1シナリオだけ作成する。 webmockあると異常系のテストがやりやすい(例えばawsが500エラー出す場合) # フリートーク * rubocop指摘された後どの程度従う?(sanoさん) 次回の表参道.rbで静的解析のLTあります! チームで守るべき規約を守らせるもの。チームの実態に即し、ルールを決めるのが良い [onkcop](https://github.com/onk/onkcop/blob/master/config/rubocop.yml)には理由付け [forkwellcop](https://github.com/grooves/forkwell_cop/blob/master/config/todo.yml)もあるよ! 一度onにして、議論する [永和さん](https://github.com/esminc/deka_eiwakun)もあるよ! rubocopにプルリク投げるとabcsizeで怒られるので気をつけましょう。 # 次回テーマリクエスト なし

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