Getting to Know ActiveSupport::Callbacks by Tom Mango
While writing ActiveConfiguration, I needed a way to run a callback when certain methods were executed. Thankfully, ActiveSupport was already available, so I had access to ActiveSupport::Callbacks. What is a Callback? At this point, you may be wondering what a callback even is. Simply put, a callback allows you to run some code (usually a method) automatically when another piece of code is run. In
Rails + AWS でモバイルフレンドリーな動画配信サイト構築 - メドピア開発者ブログ
あけましておめでとうございます。 メドピアのSRE @kenzo0107 です。 2018年もよろしくお願いします。 今回は昨年リニューアルした動画配信システムについてです。 経緯 これまでのメドピアの動画配信は CloudFront 経由で S3 上の mp4 を video タグで参照し配信してました。 この配信方法では CloudFront でキャッシュしづらく 通信状況によってはファーストビューまでに時間が掛かり、サイト離脱へ繋がります。 また、直リンク禁止の動画の場合、 リファラチェック等をするかと思いますが 一部 IE Edge のバージョンで video タグでリファラ参照ができないという仕様があり*1 既存の仕組みをフロントから変える必要がありました。 以上の経緯から動画配信の仕組みを見直し要件を洗い出しました。 要件 動画は mp4 で納品される為、HLS形式へエンコード
How I Reduced my DB Server Load by 80%
❶ Author of How to Open Source (.dev). A book to take you from coder to contributor. ❷ Creator of CodeTriage, a free service helping developers contribute to open source. ❸ Core committer to ruby/ruby. ❹ Married to Ruby, literally. Database load can be a silent performance killer. I’ve been optimizing the query performance of a web app I run designed to get people involved in open source, but was
The Publish-Subscribe Pattern on Rails: An Implementation Tutorial | Toptal®
The publish-subscribe pattern (or pub/sub, for short) is a Ruby on Rails messaging pattern where senders of messages (publishers), do not program the messages to be sent directly to specific receivers (subscribers). Instead, the programmer “publishes” messages (events), without any knowledge of any subscribers there may be. Similarly, subscribers express interest in one or more events, and only re
使えるRSpec入門・その3「ゼロからわかるモック（mock）を使ったテストの書き方」 - Qiita
はじめに みなさんこんにちは！ この記事は「必要最小限の努力で最大限実戦で使える知識を提供するRSpec入門記事」、略して「使えるRSpec入門」の第3回です。 今回はRSpecのモックを使ったテストについて説明します。 これまでモックを全く使ったことがない人でもわかるように丁寧に説明していくつもりです。 また、これまでの回と同様、個人的に使用頻度が低いと思っている内容についてはバッサリ説明を省きます。 ただし、第1回や第2回に比べるとテストコードが少し複雑になって、仕組みや動きを想像するのがちょっと難しいかもしれません。 ぱっと頭に入ってこない場合はじっくり本文を読んだり、実際に自分で写経しながらコードを動かしたりするなどして、少し時間をかけながら理解するようにしてください。 今回は以下のような内容を説明します。 モックの基本的な使い方 モックを使った検証 モックでわざとエラーを発生させ
ThePracticalDev.com is available at DomainMarket.com
What's in your Domain Name? Print This domain name will potentially help you bring in more customers and profits every day, as the domain itself goes up in value. A super premium .Com domain name from DomainMarket.com means instant branding, search engine, and marketing benefits. We make it safe, easy and affordable for you to own ThePracticalDev.com right away. Click here to purchase ThePractical
How Arel Converts Ruby Queries Into SQL Statements
This is the second in a series of Postgres posts that Pat Shaughnessy wrote based on his presentation at the Barcelona Ruby Conference. You can also watch the video recording of the presentation. The series was originally published on his personal blog, and we are republishing it on Codeship with his kind permission. In one of the climactic scenes in20,000 Leagues Under the Sea, Captain Nemoand hi
React.js - A guide for Rails developers
Fernando Villalobos I’ve been developing web platforms for a living for the past 8 years. I’m an agile practitioner and a big advocate of TDD, code review and refactoring as means to increase code quality. Introduction to React.js React.js is the new popular guy around the "JavaScript Frameworks" block, and it shines for its simplicity. Where other frameworks implement a complete MVC framework, we
FactoryGirl Tips and Tricks by Arjan van der Gaag
← back to all talks and articles FactoryGirl Tips and Tricks FactoryGirl is an awesome fixture replacement library that gives you a lot of power and flexibility, at the cost of more code to maintain and increased mental overhead. It pays get to know it, so you can wield its flexibility to improve your tests and your productivity. Get the most out of FactoryGirl 1. Use traits for modular factories
GitHub - eliotsykes/rspec-rails-examples: RSpec cheatsheet & Rails app: Learn how to expertly test Rails apps from a model codebase
An RSpec cheatsheet in the form of a Rails app. Learn how to expertly test Rails apps from a model codebase A small yet comprehensive reference for developers who want to know how to test Rails apps using RSpec. Here you'll find in-depth examples with detailed documentation explaining how to test with RSpec and related testing gems, which you can then apply to your own projects. This application w
Railsの設定 | Rails日本語ドキュメント | Ruby STUDIO
このガイドでは、Railsアプリケーションの設定と利用可能な機能の初期化について説明します。 このガイドを読むことで、次の事が学べるはずです。 Railsアプリケーションの動作を適合させる方法 アプリケーション開始時に追加コードを実行する方法 1. 初期化コードの置き場所 2. Railsの前にコードを実行する 3. Railsコンポーネントの構築 4. Rails環境の設定 5. 初期化ファイルの使用 6. イベントの初期化 7. データベースのプーリング 1. 初期化コードの置き場所 Railsは初期化コードの配置をするにあたり、標準で4つの場所を提供します。 config/application.rb 環境特有の設定ファイル Initializers Initializers後 2. Railsの前にコードを実行する 稀なケースですが、アプリケーションがRailsが読み込まれる前に幾
5 Simple Tweaks to Make Your Rails App Faster
In this three-part series, I will present simple tweaks you can make to your Rails app that each take about 5 minutes. These tweaks will improve the performance of your app, your productivity while developing it, and your sanity through avoiding future headaches. In this first part, we’ll talk about performance and how to speed up a sluggish Rails app. 1. (Properly) Index your Database Indexes are
Curious Reflections
In a data sensitive application debugging is the most critical and time consuming especially if requests traffic is tremendously high, when it comes to debugging every developer's last resort is application logs and debugging in large logs file is not an easy task. In this post I will brief you about how we can make... Continue Reading →
DDD for Rails Developers | Victor Savkin's
blog about building large applications in JavaScript and Ruby Working more and more on large rails applications I’ve noticed that in many ways DDD and Rails contradict each other. Therefore, I’ve decided to write a short series of articles, which will be my attempt to reconcile both paradigms and to find a way to use DDD while not fighting Rails. DDD for Rails Developers. Part 1: Layered Architect
リリース、障害情報などのサービスのお知らせ
最新の人気エントリーの配信
j次のブックマーク
k前のブックマーク
lあとで読む
eコメント一覧を開く
oページを開く
Write Reliable, Asynchronous Integration Tests With Capybara
Designing a Great Ruby API -- How we're simplifying Rails 5
[rk10][29S08] How to survive in post Rails' world![[rk10][29S08] How to survive in post Rails' world](https://cdn-ak-scissors.b.st-hatena.com/image/square/b54ca51a2fb8143fc7621172542a88bc449baaaf/height=288;version=1;width=512/http%3A%2F%2Fnicovideo.cdn.nimg.jp%2Fthumbnails%2F11930316%2F11930316)
Exposing Configuration Options in Rails Engines
This domain has been registered for a customer by nicsell
APIs on Rails, Building REST APIs with Rails - Abraham Kuri Vargas | Softcover.io