ActiveRecord4ã§ã“ã‚“ãªSQLクエリã©ã†æ›¸ãã®? Arelç·¨ | Webシステム開発ï¼æ•™è‚²ã‚½ãƒªãƒ¥ãƒ¼ã‚·ãƒ§ãƒ³ã®ã‚¿ã‚¤ãƒ インターメディア
ActiveRecord4ã§ã“ã‚“ãªSQLクエリã©ã†æ›¸ãã®ï¼Ÿ Mergeç·¨ ã§ã¯ã€é–¢é€£å…ˆã®scopeを使ã†ã“ã¨ãŒã§ãã‚‹mergeを紹介ã—ã¾ã—ãŸã€‚mergeを使ã†äº‹ã§ã€å¤‰æ›´ã«å¼·ã„クエリを美ã—ã組ã¿ç«‹ã¦ã‚‹ã“ã¨ãŒã§ãã¾ã—ãŸã€‚ 今回ã¯ã€ActiveRecord4ã§æ›¸ãã«ãã„SQLクエリãŸã¡ã‚’紹介ã—ã¾ã™ã€‚ 書ãã«ãã„クエリã¨ã¯ã€å…·ä½“çš„ã«ã¯ä»¥ä¸‹ã®ã‚‚ã®ãŒã‚ã’られã¾ã™ã€‚ 比較演算ORlikeleft outer joinunionサブクエリexists ActiveRecordã§ã“れらã®ã‚¯ã‚¨ãƒªã‚’組ã¿ç«‹ã¦ã‚‹å ´åˆã€ã©ã†ã—ã¦ã‚‚美ã—ããªã„（SQLæ–‡å—列をã¹ã£ãŸã‚Šæ›¸ã„ã¦ã—ã¾ã†ã‚ˆã†ãªï¼‰æ›¸ãæ–¹ã¨ãªã£ã¦ã—ã¾ã„ãŒã¡ã§ã™ã€‚ ã“ã®å‡¦ç†ã‚’美ã—ã書ããŸã‚ã«ã¯ã€ActiveRecordã ã‘ã®æ©Ÿèƒ½ã§ã¯è¶³ã‚Šãšã€ActiveRecordãŒå†…部ã§ä½¿ã£ã¦ã„ã‚‹Arelã¨ã„ã†ãƒ©ã‚¤ãƒ–ラリを使ã†å¿…è¦ãŒã§ã¦ãã¾ã™ã€‚ 今回ã¯ã€Arelを使ã£ã¦è¯éº—ã«SQLク
ActiveRecord4ã§ã“ã‚“ãªSQLクエリã©ã†æ›¸ãã®ï¼Ÿ Mergeç·¨ | Webシステム開発ï¼æ•™è‚²ã‚½ãƒªãƒ¥ãƒ¼ã‚·ãƒ§ãƒ³ã®ã‚¿ã‚¤ãƒ インターメディア
ActiveRecord4ã§ã“ã‚“ãªSQLクエリã©ã†æ›¸ãã®ï¼Ÿ Mergeç·¨ #activerecord#rails#ruby 2013å¹´ 10月 24æ—¥ nishio 「ã“ã®ãƒ‡ãƒ¼ã‚¿å–å¾—ã™ã‚‹ã®ã«SQLã§ã¯ã“ã†ã„ã†é¢¨ã«æ›¸ã‘ã°ã„ã„ã‚“ã ã‘ã©ã€ActiveRecordã§ã¯ä¸€ä½“ã©ã†æ›¸ã‘ã°ã„ã„ã®ï¼Ÿã€ 毎回ã“ã®èª²é¡Œã«æ‚©ã¾ã•ã‚Œã¦ã„ã¾ã™ã€‚ 特ã«æ¥å‹™ã‚¢ãƒ—リã®å ´åˆã€ã¨ã¦ã¤ã‚‚ãªã複雑ãªSQLを投ã’ã‚‹å ´åˆãŒã‚ã‚Šã¾ã™ã€‚ ã‚‚ã®ã™ã”ã„æ•°ã®ãƒ†ãƒ¼ãƒ–ルをjoinã—ã¦ã€existsã§æ¡ä»¶ã¿ã¦ã€union allã—ã¦ã€‚。。 ãªã‚“ã¦ã„ã†å‡¦ç†ãŒã§ã¦ãã‚‹ã¨ã€ã•ã™ãŒã«ActiveRecordã‚„Datamapperを使ã£ã¦ã‚¯ã‚¨ãƒªã‚’組ã¿ç«‹ã¦ã‚‹ã®ã‚’ã‚ãらã‚ã¦ã€ç›´æŽ¥SQLを書ã„ã¦ã—ã¾ã†ã“ã¨ãŒã‚ã‚Šã¾ã™ã€‚ ã§ã‚‚ã€ã§ãã‚Œã°ActiveRecordを使ã£ã¦ã‚¹ãƒžãƒ¼ãƒˆã«SQLを組ã¿ç«‹ã¦ãŸã„ã‚‚ã®ã§ã™ã€‚ scopeã§æ›¸ã„ã¦ãŠã‘ã°ã€å‡¦ç†ã‚‚使ã„回ã›ã¾ã™ã—ã。 ã¨ã„ã†ã“ã¨
ActiveRecordã®SQLインジェクションパターン
(Last Updated On: 2018å¹´10月7æ—¥)Railsã§å¤šç”¨ã•ã‚Œã¦ã„ã‚‹ActiveRecordã®ã‚¤ãƒ³ã‚¸ã‚§ã‚¯ã‚·ãƒ§ãƒ³ãƒ‘ターンを簡å˜ã«ç´¹ä»‹ã—ã¾ã™ã€‚出典ã¯rails-sqli.orgãªã®ã§ã‚ˆã‚Šè©³ã—ã„解説ã¯ã“ã¡ã‚‰ã§ç¢ºèªã—ã¦ãã ã•ã„。特ã«æ°—ã‚’ã¤ã‘ã‚‹å¿…è¦ãŒã‚ã‚‹ã¨æ€ã‚れる物ã®ã¿ã‚’ピックアップã—ã¾ã—ãŸã€‚ Exists?メソッド User.exists? params[:user] params[:user]ãªã©ã®ä½¿ã„æ–¹ã¯å±é™ºã§ã™ã€‚Railsã¯PHPãªã©ã¨åŒæ§˜ã«user[]ã¨ã„ã†ãƒ‘ラメーターã§é…列化ã—ã¾ã™ã€‚ ?user[]=1 ãŒå…¥åŠ›ã®å ´åˆã€ SELECT 1 AS one FROM "users" WHERE (1) LIMIT 1 ã¨ãªã‚Šä¸æ£ãªã‚¯ã‚¨ãƒªãŒå®Ÿè¡Œã•ã‚Œã¾ã™ã€‚ Calculateメソッド Calculateメソッドã¯SQLã®é›†ç´„関数を実行ã™ã‚‹ãƒ¡ã‚½ãƒƒãƒ‰ã§ã™ã€‚averageã€calcula
Ruby on Rails on MySQL ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°å…¥é–€
Rails 3 ç³»+MySQL を利用ã—ã¦ã„るサービスå‘ã‘ã« 1. ã©ã®ã‚ˆã†ã«ãƒœãƒˆãƒ«ãƒãƒƒã‚¯ã‚’探ã™ã®ã‹ 2. ã©ã®ã‚ˆã†ãªè¨è¨ˆã‚’è¡Œãˆã°ã„ã„ã®ã‹ 3. Rails上ã§ã©ã®ã‚ˆã†ãªã‚³ãƒ¼ãƒ‰ã‚’書ã‘ã°ã„ã„ã®ã‹ ã®3点ã«çµžã£ã¦ã“ã®ãƒ—レゼンをã¿ã¦ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã‚’è¡Œãˆã‚‹ã‚ˆã†ã«è³‡æ–™ä½œæˆã‚’è¡Œã„ã¾ã—ãŸRead less
Rails ã§å分ã«æ´»ç”¨ã•ã‚Œã¦ã„ãªãã¦ã‚‚ã£ãŸã„ãªã„ ActiveRecord::Relation ã®ãƒ¡ã‚½ãƒƒãƒ‰ TOP 10 - æ‰é¢¨å‘‚2.0 - A Lifelog -
2013å¹´12月2日更新: å‚ç…§ã•ã‚Œã‚‹ã“ã¨ãŒå¤šã„ã®ã§ Rails 4 ã®æƒ…å ±ã‚’è¨³æ³¨ã¨ã—ã¦è¿½è¨˜ã—ã¾ã—ãŸã€‚ã¾ãŸã€Rails 4 ã«é–¢ã™ã‚‹æƒ…å ±ã¯ã€ WEB+DB PRESS Vol.73 ãŒéžå¸¸ã«å‚考ã«ãªã‚‹ã®ã§ã€ä¸€èªã‚’ãŠã™ã™ã‚ã—ã¾ã™ã€‚ ã“ã®æ–‡ç« 㯠Mitch Crowe æ°ã®ãƒ–ãƒã‚°ã‚ˆã‚Š 2012å¹´4月14æ—¥ã®è¨˜äº‹ã‚’翻訳ã—ãŸã‚‚ã®ã§ã™ã€‚ The 10 Most Underused ActiveRecord::Relation Methods http://blog.mitchcrowe.com/blog/2012/04/14/10-most-underused-activerecord-relation-methods/ 昨日㯠ActiveRecord::Relation ã®ã‚³ãƒ¼ãƒ‰ã«è†ã¾ã§æµ¸ã‹ã£ã¦ã€ä½¿ã‚ã‚Œã¦ã„ã‚‹ã®ã‚’ã“ã‚Œã¾ã§å…¨ç„¶è¦‹ãŸã“ã¨ãŒãªã„é¢ç™½ã„ナゲットをæ€ã„出ã•ã›ã¦ãã‚ŒãŸã€‚ã“ã®è¨˜äº‹ã§ã€å分ã«æ´»ç”¨
What's new in Active Record [Rails 4 Countdown to 2013] | The Remarkable Labs Blog
This post is part of a series of 31 Rails 4 articles being released each day in December 2012. In today's Rails 4 countdown post, we are going to go over some of the changes being made to Active Record. While this list does not include every single change, it does summarize most of the non-specific database vendor changes. Null Object Pattern Being introduced in Rails 4 is ActiveRecord::QueryMetho
ActiveRecordã® :include 㨠:joins ã§ç™ºè¡Œã•ã‚Œã‚‹SQLãŒå…¨ãé•ã†ã‚ˆã†ã§ã™ - (ﾟ∀ﾟ)o彡 sasata299's blog
2010å¹´04月26æ—¥00:03 Ruby ActiveRecordã® :include 㨠:joins ã§ç™ºè¡Œã•ã‚Œã‚‹SQLãŒå…¨ãé•ã†ã‚ˆã†ã§ã™ ã‚ã‹ã‚‰ãªã„ã“ã¨ãŒä¸€æ¯ï¼ï¼ä»Šå›žã¯ ActiveRecord 㧠JOIN ã™ã‚‹ãŸã‚ã«ä½¿ã† :include オプション㨠:joins オプションã®é•ã„を調ã¹ã¦ã¿ã¾ã—ãŸã€‚ActiveRecord 2.3.5 ã§ã™ã€‚ 利用ã™ã‚‹ãƒ‡ãƒ¼ã‚¿ã¨ã—ã¦ã¯ blog has many articles ãªé–¢ä¿‚ã§ã€1ã¤ã® blog ã‚ãŸã‚Š10個ã®è¨˜äº‹ã‚’æŒã£ã¦ã„ã‚‹ã¨ã—ã¾ã™ã€‚具体的ã«ã¯ã“ã®ã‚ˆã†ãªçŠ¶æ…‹ã§ã™ã€‚ # blogs テーブル +----+--------+---------------------+---------------------+ | id | name | created_at | updated_at | +----+--------+-------
ActiveRecord::Callbacks
Active Record Callbacks Callbacks are hooks into the life cycle of an Active Record object that allow you to trigger logic before or after a change in the object state. This can be used to make sure that associated and dependent objects are deleted when ActiveRecord::Base#destroy is called (by overwriting before_destroy) or to massage attributes before they’re validated (by overwriting before_vali
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