Ruby on Rails ã‚’å¦ã¶ - validation エラーã®è¡¨ç¤ºã‚’ validation é †ã«æƒãˆã‚‹ - Rails ã§è¡Œã“ã†ï¼ãŸã¨ãˆã° title:string, body:text ã¨ã„ã†ï¼’ã¤ã®å±žæ€§ã‚’æŒã¤ãƒ¢ãƒ‡ãƒ« Entry ãŒã‚ã£ãŸã¨ã™ã‚‹ã€‚ãã“ã§æ¬¡ã®ã‚ˆã†ãª validation を掛ã‘ãŸã¨ã—よã†ã€‚ class Entry < ActiveRecord::Base validates_presence_of :title validates_presence_of :body end ã“ã‚Œã«å¯¾ã™ã‚‹å…¥åŠ›ãƒ•ã‚©ãƒ¼ãƒ ã®ãƒ“ューã¯ã“ã‚“ãªæ„Ÿã˜ã 。 <%= error_messages_for 'entry' %> <!--[form:entry]--> <p><label for="entry_title">Title</label><br/> <%= text_field 'entry', 'title' %></p> <p><label for="entry_body">Body</label><br/> <%= text
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