如何使用 Rails 4 和 Ruby 2.0 应用程序实时重新加载？

Question

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，我想查看浏览器中的实时更改。

我尝试了 Guard 和 Guard-live-reload，但它抛出了以下错误。

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 `<top (required)>'
> [#] /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 `<main>'
> [#] /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 `<main>'
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 `<top (required)>'
    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 `<main>'
    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 `<main>'

Answer 1

这就是我使用 livereload 的方式：

1.)获取宝石

在您的 Gemfile 中：

group :development do
  gem 'guard-livereload', require: false
end

2.) guard init livereload ，它将在您的应用程序的根目录生成一个Guardfile 。

3.)打开你的 Guardfile，它应该看起来像这样（只是 Guard-Livereload，如果你运行其他保护插件，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 Web Store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并输入-> guard

6.）在您的浏览器中按下 livereload 按钮，它应该链接它（浏览器在 Guard 选项卡中连接）

我为其他可能偶然发现相同问题的人广泛编写了它。 对于您的具体情况，请阅读#3 。 打开您的保护文件并确保首先调用 livereload。

去看Railscast #264 Guard

使用 SSL 时，livereload 不太喜欢这样。

Rack-Livereload是一个简洁的小宝石，您可以将其添加到您的项目中以解决 SSL 问题。 gem 插入一个或 Rack 中间件，并基本上连接到 livereload 应用程序，以通过现有的（和启用 SSL 的）Rails 服务器提供 javascript。

Answer 2

请检查https://github.com/railsjazz/rails_live_reload可以在 Rails 应用程序中使用。

使用它，如果您在其中进行编辑，或者当您更改语言环境文件或 CSS 等时，您可以仅重新加载渲染的页面。