如何使用Rails 4和Ruby 2.0应用程序进行实时重新加载？
如果我在Rails 4 + Ruby 2.0项目的文本编辑器中编辑.scss或.erb文件，我想在浏览器中看到实时更改。
我尝试了Guard和Guard-live-reload，但它引发了以下错误。
22:58:04 - ERROR - Could not load 'guard/rspec' or find class Guard::Rspec 22:58:04 - ERROR - /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/plugin_util.rb:100:in `require' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/plugin_util.rb:100:in `plugin_class' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/plugin_util.rb:57:in `initialize_plugin' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard.rb:167:in `add_plugin' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/dsl.rb:174:in `block in guard' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/dsl.rb:173:in `each' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/dsl.rb:173:in `guard' > [#] /home/jitendra/milaap-webapp/Guardfile:4:in `_instance_eval_guardfile' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/guardfile/evaluator.rb:97:in `instance_eval' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/guardfile/evaluator.rb:97:in `_instance_eval_guardfile' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/guardfile/evaluator.rb:37:in `evaluate_guardfile' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/setuper.rb:148:in `evaluate_guardfile' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/setuper.rb:64:in `setup' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/commander.rb:24:in `start' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/cli.rb:107:in `start' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor/command.rb:27:in `run' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor/invocation.rb:126:in `invoke_command' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor.rb:359:in `dispatch' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor/base.rb:440:in `start' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/bin/guard:6:in `' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/bin/guard:23:in `load' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/bin/guard:23:in `' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/bin/ruby_executable_hooks:15:in `eval' > [#] /home/jitendra/.rvm/gems/ruby-2.1.1@global/bin/ruby_executable_hooks:15:in `' 22:58:04 - ERROR - Invalid Guardfile, original error is: > [#] undefined method `superclass' for nil:NilClass /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/plugin_util.rb:57:in `initialize_plugin': undefined method `superclass' for nil:NilClass (NoMethodError) from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard.rb:167:in `add_plugin' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/dsl.rb:174:in `block in guard' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/dsl.rb:173:in `each' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/dsl.rb:173:in `guard' from /home/jitendra/milaap-webapp/Guardfile:4:in `_instance_eval_guardfile' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/guardfile/evaluator.rb:97:in `instance_eval' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/guardfile/evaluator.rb:97:in `_instance_eval_guardfile' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/guardfile/evaluator.rb:37:in `evaluate_guardfile' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/setuper.rb:148:in `evaluate_guardfile' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/setuper.rb:64:in `setup' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/commander.rb:24:in `start' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/lib/guard/cli.rb:107:in `start' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor/command.rb:27:in `run' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor/invocation.rb:126:in `invoke_command' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor.rb:359:in `dispatch' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor/base.rb:440:in `start' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/gems/guard-2.6.1/bin/guard:6:in `' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/bin/guard:23:in `load' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/bin/guard:23:in `' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/bin/ruby_executable_hooks:15:in `eval' from /home/jitendra/.rvm/gems/ruby-2.1.1@global/bin/ruby_executable_hooks:15:in `' 这就是我使用livereload的方式：
1.）获取gem
在你的Gemfile中：
group :development do gem 'guard-livereload', require: false end
2.） guard init livereload ，它将在你的应用程序的根目录下生成一个Guardfile 。
3.）打开你的Guardfile它应该是这样的（只是Guard-Livereload，如果你运行其他防护插件，请确保它们低于livereload。）
guard 'livereload' do watch(%r{app/views/.+\.(erb)$}) watch(%r{app/helpers/.+\.rb}) watch(%r{public/.+\.(css|js|html)}) watch(%r{config/locales/.+\.yml}) watch(%r{(app|vendor)(/assets/\w+/(.+\.(css|js|html|png|jpg))).*}) { |m| "/assets/#{m[3]}" } end
4.）从Chrome网上应用店获取Livereload Chrome应用程序
5.）重新启动服务器并打开一个单独的选项卡，然后键入 – > guard
6.）在浏览器中按下livereload按钮，它应该链接它（在Guard选项卡中连接浏览器）
我为其他人写了很多文章，可能会偶然发现同样的问题。 对于您的具体案例，请阅读＃3 。 打开你的guardfile并确保首先调用livereload。
去观看Railscast＃264 Guard
使用SSL时，livereload不太喜欢。
Rack-Livereload是一个整洁的小gem，您可以将其添加到项目中以解决SSL问题。 gem插入一个Piece或Rack中间件，基本上连接到livereload应用程序，通过现有的（和启用SSL的）Rails服务器提供javascript。