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ActiveRecord’s queries tricks
My favourite part of Rails is clearly ActiveRecord’s scopes. Their expressiveness and their reusability is simply great. You’ll see below five tricks I usually bring during consulting missions. 1) Join query with condition on the associated tableSay you have a users table, with a profile association. If you need to query users which profile is validated you may end up doing: # User model scope :ac
Using Rails with a legacy database schema
Rails is known for its convention over configuration design paradigm. For example, database table and column names are automatically derived and generated from the model classes. This is very convenient, but when you want to build a new application upon an existing (“legacyâ€) database schema you have to explore the configuration side of this paradigm. The most basic operation for dealing with a le
rails æ—¢å˜DBを使ã£ã¦railsã—ã¦ã¿ãŸã€‚ - 日々ã®è¨˜éŒ²ã€‚
環境 osx10.9.1 ruby2.0.0 rails4 MySQL5.6.x 経緯 æ—¢ã«MySQL上ã«å˜åœ¨ã™ã‚‹tableを使ã£ã¦railsã—ã¦ã¿ãŸã€‚ MySQLã¨æŽ¥ç¶šã™ã‚‹ 下ã®ã‚µã‚¤ãƒˆã‚’å‚考ã«ã—ã¦ã€database.yamlを定義。 - development: adapter: mysql2 encoding: utf8 database: my_db_name username: root password: root host: localhost pool: 5 timeout: 5000 å‚考サイト http://threetreeslight.com/post/61834000065/rails-db MySQL上ã®ãƒ†ãƒ¼ãƒ–ルã‹ã‚‰scheme.rbを生æˆã™ã‚‹ã€‚ rake environment -v -t RAILS_ENV=development db:schema:dump
Five Active Record Features You Should Be Using
Active Record is responsible for communicating with the persistence layer by default in Ruby on Rails applications. Using Active Record effectively and efficiently can greatly improve an application’s code. In Ruby on Rails 4.0, some material changes have been made to Active Record. Understanding these changes, and how they are best utilized is important for any Rails developer. To help explain th
Ruby on Rails - ActiveRecord - — ã‚ã‚Šãˆã‚‹ãˆã‚Šã‚
æ–¹é‡ Rubyを知ã£ã¦ã„ã‚‹å‰æã§ã™(å‰å›žã®å‹‰å¼·ä¼šã®è³‡æ–™ http://dev.ariel-networks.com/articles/workshop/ruby/) RDBã®åŸºç¤ŽçŸ¥è˜ãŒå‰æã§ã™ ãªã‚‹ã¹ã手を動ã‹ã—ã¦ç›®ã«è¦‹ãˆã‚‹å½¢ã§èª¬æ˜Žã‚’進ã‚ã¾ã™ Ruby on Rails(以下ã€Rails)全体ã¯å·¨å¤§ãªã®ã§ã€ActiveRecord(ORM層)ã«è©±ã‚’é™å®šã—ã¾ã™(Web層ã¯æ¬¡å›ž) Webã‹ã‚‰åˆ‡ã‚Šé›¢ã—ã¦irb or コマンドラインã§ActiveRecordを使ã„ã¾ã™
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