{"id":1698,"date":"2008-02-09T06:56:07","date_gmt":"2008-02-08T22:56:07","guid":{"rendered":"http:\/\/ihower.idv.tw\/blog\/archives\/1698"},"modified":"2011-04-09T02:16:20","modified_gmt":"2011-04-08T18:16:20","slug":"ruby-define_method","status":"publish","type":"post","link":"https:\/\/ihower.tw\/blog\/1698-ruby-define_method","title":{"rendered":"\u4e00\u4e9b Ruby Dynamic Features \u8a18\u4e8b (3) define_method"},"content":{"rendered":"<p>Update(2010\/4\/15): <a href=\"http:\/\/gist.github.com\/366372\">self, current class \u8207 class_eval, instance_eval \u7684\u95dc\u4fc2<\/a><\/p>\n<p>define_method \u8b93\u51fd\u5f0f\u540d\u7a31\u4e5f\u53ef\u4ee5\u53c3\u6578\u5316\u3002<\/p>\n<p><!--more--><\/p>\n<h2>\u52d5\u614b\u5b9a\u7fa9\u7269\u4ef6\u65b9\u6cd5 drag.foo<\/h2>\n<pre>\r\n#\u6cd5\u4e00\r\nDragon.send(:define_method, :foo){ puts \"bar\" }\r\n\r\n#\u6cd5\u4e8c\r\nclass Dragon\r\n    define_method(:foo) { puts \"bar\" }\r\n    \r\n    ['a','b','c','d','e','f'].each do |x|\r\n        define_method(x) { puts x }\r\n     end\r\nend\r\n\r\n#\u6cd5\u4e09\r\nDragon.class_eval do\r\n    define_method(:foo) { puts \"bar\" }\r\n    \r\n    def foo2\r\n        puts \"bar2\"\r\n    end\r\nend\r\n\r\n#\u6cd5\u56db\r\nclass Dragon\r\n    def new_method(name, &block)\r\n        self.class.send(:define_method,name, &block)\r\n        #\u6216\r\n        self.class.class_eval do\r\n            define_method(name, &block)\r\n        end\r\n    end\r\nend\r\n\r\ndrag.new_method(:foo) { puts \"bar\" }\r\n\r\n<\/pre>\n<h2>\u52d5\u614b\u5b9a\u7fa9\u985e\u5225\u65b9\u6cd5 Dragon.foo <\/h2>\n<pre>\r\n# \u6cd5\u4e00\r\nclass Dragon\r\n    class &lt;&lt; self\r\n        define_method(:foo) { puts \"bar\" }\r\n    end\r\nend\r\n\r\n# \u6cd5\u4e8c\r\nclass Dragon; end\r\n\r\nmetaclass = (class << Dragon; self; end)\r\nmetaclass.instance_eval do # \u7528 class_eval \u4e5f\u53ef\u4ee5\r\n    define_method(\"foo\") { puts \"bar\" }\r\nend\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Update(2010\/4\/15): self, current class \u8207 class_eval, in &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/ihower.tw\/blog\/1698-ruby-define_method\" class=\"more-link\">\u95b1\u8b80\u5168\u6587<span class=\"screen-reader-text\">\u3008\u4e00\u4e9b Ruby Dynamic Features \u8a18\u4e8b (3) define_method\u3009<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[5,31],"tags":[],"class_list":["post-1698","post","type-post","status-publish","format-standard","hentry","category-programming","category-ruby","entry"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p1q6tG-ro","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/posts\/1698","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/comments?post=1698"}],"version-history":[{"count":5,"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/posts\/1698\/revisions"}],"predecessor-version":[{"id":5585,"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/posts\/1698\/revisions\/5585"}],"wp:attachment":[{"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/media?parent=1698"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/categories?post=1698"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/tags?post=1698"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}