Force index with active record find « Jason Watkins’s Weblog
A small useful tip: Mysql’s query planner occasionally has trouble picking the right index. I’ve found that normally if you try variations long enough, eventually you find a way to do the right thing. Recently however I ran into one I couldn’t coax. No big deal you say, after all, that’s what find_by_sql is for no? Only problem is, the query in question was inside a with_scope block, and I really
ActiveRecord 㨠ActiveSupport を使ã£ã¦ã‚³ãƒžãƒ³ãƒ‰ãƒ©ã‚¤ãƒ³ã‚¢ãƒ—リを作る - ma2’s diary
ç›®ã®å‰ã«ã¯csvã®å±±ãŒã‚る。ã“れをrdbã«çªã£è¾¼ã¾ãªã„ã¨ã„ã‘ãªã„。ãã®å¾ŒrailsアプリãŒãã®rdbを使ã†ã®ã§ã‚る。csvã¯ä½•ç¨®é¡žã‹ã‚ã£ã¦ï¼Œç´ ç›´ã«ãƒ†ãƒ¼ãƒ–ルã«å¯¾å¿œã—ã¦ã„ã‚‹ã‚ã‘ã˜ã‚ƒãªã„。ã¤ãƒ¼ã“ã¨ã¯çªã£è¾¼ã‚€ã¨ãã«ActiveRecordを使ãˆã‚Œã°ãƒ©ã‚¯ã˜ã‚ƒã‚ã¨æ€ã£ãŸã€‚ARã ã‘ã˜ã‚ƒãªãã¦ï¼Œä¾¿åˆ©ãªãƒ¡ã‚½ãƒƒãƒ‰ãŒãŸãã•ã‚“å…¥ã£ã¦ã„ã‚‹ActiveSupportも使ã„ãŸã„。ã¨ã‚Šã‚ãˆãšä½•ã‚‚考ãˆãšã«ã‚¹ã‚¯ãƒªãƒ—トを書ã„ã¦ã¿ã‚‹ã€‚ require 'rubygems' require_gem 'activerecord' ã¨ã™ã‚Œã°ARã¯ï¼ˆActiveSupportも）使ãˆã‚‹ã‚ˆã†ã«ãªã‚‹ã€‚ã§ã‚‚モデルã¯railsã§ä½œã£ãŸãƒ¢ãƒ‡ãƒ«ã‚’ãã®ã¾ã¾ä½¿ã„ãŸã„。åŒã˜å®šç¾©ã‚’コピペã—ã¦ã‚‚ã„ã„ã‚“ã ã‘ã©ï¼Œãƒãƒ¼ã‚¸ãƒ§ãƒ³ãŒãšã‚ŒãŸã‚Šã™ã‚‹ã¨å›°ã‚‹ã—。 require 'rubygems' require_gem 'activerecord' $LOAD_PATH.p
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
acts_as_searchable を試ã™(1) - Rubricks Project
Rubricksã§ã¯CMSã®ä¸Šã«ä¹—ã£ã‹ã‚‹ã‚µãƒ¼ãƒ“スをRailsコンãƒãƒ¼ãƒãƒ³ãƒˆã®å½¢ã§æä¾›ã™ã‚‹ã€‚ãã“ã§å„コンãƒãƒ¼ãƒãƒ³ãƒˆã‚’一元的ã«æ¤œç´¢ã™ã‚‹çª“å£ã¨ã—ã¦æ¤œç´¢æ©Ÿèƒ½ã‚’æä¾›ã™ã‚‹ã¹ã試行錯誤ä¸ãªã®ã ãŒã€æ°—ã«ãªã£ã¦ã„ãŸã®ãŒacts_as_searchableã 。ã“ã‚Œã¯å…¨æ–‡æ¤œç´¢ã‚¨ãƒ³ã‚¸ãƒ³ã§ã‚ã‚‹HyperEstraierã¨ActiveRecordãŒé€£æºã—ã¦DBã«æ ¼ç´ã—ãŸãƒ‡ãƒ¼ã‚¿ã‚’全文検索ã§ãるよã†ã«ã—ã¡ã‚ƒãŠã†ã¨ã„ã†ãƒ—ラグインã®ã‚ˆã†ã 。 ã¾ãšã¯å…¨æ–‡æ¤œç´¢ã‚¨ãƒ³ã‚¸ãƒ³ã§ã‚ã‚‹HyperEstraierをインストールã™ã‚‹å¿…è¦ãŒã‚る。Namazuã¨é•ã£ã¦ãƒ¬ãƒ³ã‚¿ãƒ«ã‚µãƒ¼ãƒç‰ã«å°Žå…¥æ¸ˆã®å¯èƒ½æ€§ã¯æ¥µã‚ã¦ä½Žã„ã®ã§ã€ã¾ãŸæ•·å±…ãŒä¸ŠãŒã£ã¦ã—ã¾ã„ãã†ã 。個人的ã«ã¯HyperEstraierã¯OSSã®å…¨æ–‡æ¤œç´¢ã‚¨ãƒ³ã‚¸ãƒ³ã«ãŠã„ã¦Namazuã«ä»£ã‚るデファクトã«ãªã‚‹ã¨æ€ã£ã¦ã„ã‚‹ã®ã§ã€ä»Šã‹ã‚‰ã‚ªãƒ—ションã¨ã—ã¦ã‚µãƒãƒ¼ãƒˆã—ã¦ãŠãã®ã‚‚良ã„ã“ã¨ã ã¨ç„¡ç†ã‚„ã‚Šç´å¾—ã—ã¦å…ˆã«é€²ã‚€ã€‚
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ã²ã’ã‚ã » Railsアプリã§ActiveRecordを使ã£ãŸãƒãƒƒãƒå‡¦ç† ãã®ï¼“
http://uk-studio.net/category/programming/ruby/page/2/
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