Rails2.0ã¨Rails1.2ã‚’å…±å˜ã•ã›ã‚‹æ–¹æ³• - moroã®æ—¥è¨˜ã¨ã„ã†ã‹ã‚³ãƒžãƒ³ãƒ‰ä»˜ãã®gemを複数ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã‚’å…±å˜ã•ã›ã‚‹æ–¹æ³•ã€‚ コマンドã®ç¬¬ä¸€å¼•æ•°ã«_ã€ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã€‘_を渡ã—ã¾ã™ã€‚ $ rails _1.2.6_ -v Rails 1.2.6 $ rails _2.0.2_ -v Rails 2.0.2Railsã®å ´åˆã¯railsコマンドã§ã‚¢ãƒ—リã®å¤–æž ã‚’ä½œã£ã¦ã—ã¾ãˆã°ã€ãれ以é™ã¯ã“ã®æŒ‡å®šã¯å¿…è¦ãªã„(config/environment.rbã§RAILS_GEM_VERSIONã—ã¦ã‚‹ã®ã§)。ã¨ã„ã†ã“ã¨ã§Rails自体ã¯1.2.6ã‹ã‚‰å‹‰å¼·ã—ãŸã„(å‚考書も多ã„ã—)ã‘ã©ã€ãŸã¾ã«ã¯2.0ç³»ã®ã‚³ãƒ¼ãƒ‰ã‚‚èªã‚“ã§ã¿ãŸã„ã€ã¨ã„ã†äººãªã‚“ã‹ã¯ã“ã†ã™ã‚‹ã¨ã‚ˆã„ã‹ã¨ã€‚ ã‚‚ã£ã¨ã¡ã‚ƒã‚“ã¨çŸ¥ã‚ŠãŸã„ã¨ã„ã†äººã¯ã€gemã§å…¥ã‚Œã‚‹ã¨ã‚³ãƒžãƒ³ãƒ‰ãŒã“ã†ãªã‚‹ã¨ã„ã†ã“ã¨ã‚’知ã£ã¦ãŠã‘ã°OK。㧠require 'rubygems' version = ">= 0" if ARGV.first =~ /^_(.
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