如何在Rails中启用自动代码重新加载

Question

有没有办法在开发环境中使用Rails应用程序执行“热代码重新加载”？

例如：我正在研究Rails应用程序，我在样式表中添加了几行css，我查看浏览器以查看修改的样式。截至目前，我必须刷新页面cmd-r或点击刷新按钮。

有没有办法让页面在更改时自动重新加载？

这在凤凰网框架中很好地工作（我相信凤凰城不是这个功能的唯一框架）。在Ruby on Rails中如何启用这样的功能？

Answer 1

当您更改js元素（不是css或ruby文件）时，此gem会自动重新加载。

https://github.com/rmosolgo/react-rails-hot-loader

从未见过的CSS热码在轨平台重装。

Answer 2

CSS热插拔和自动重装时HTML/JS的变化可以用后卫组合，而实现与livereload：https://github.com/guard/guard-livereload

Answer 3

我使用这个设置重新加载的所有资产，JS，CSS，Ruby文件

在Gemfile中

group :development, :test do 
    gem 'guard-livereload', '~> 2.5', require: false 
end 

group :development do 
gem 'listen' 
gem 'guard' 
gem 'guard-zeus' 
gem 'rack-livereload' 
end 

插入这在development.rb

config.middleware.insert_after ActionDispatch::Static, Rack::LiveReload 

我有这个在我的后卫文件

# A sample Guardfile 
# More info at https://github.com/guard/guard#readme 

## Uncomment and set this to only include directories you want to watch 
# directories %w(app lib config test spec features) \ 
# .select{|d| Dir.exists?(d) ? d : UI.warning("Directory #{d} does not exist")} 

## Note: if you are using the `directories` clause above and you are not 
## watching the project directory ('.'), then you will want to move 
## the Guardfile to a watched dir and symlink it back, e.g. 
# 
# $ mkdir config 
# $ mv Guardfile config/ 
# $ ln -s config/Guardfile . 
# 
# and, you'll have to watch "config/Guardfile" instead of "Guardfile" 

guard 'livereload' do 
    extensions = { 
    css: :css, 
    scss: :css, 
    sass: :css, 
    js: :js, 
    coffee: :js, 
    html: :html, 
    png: :png, 
    gif: :gif, 
    jpg: :jpg, 
    jpeg: :jpeg, 
    # less: :less, # uncomment if you want LESS stylesheets done in browser 
    } 

    rails_view_exts = %w(erb haml slim) 

    # file types LiveReload may optimize refresh for 
    compiled_exts = extensions.values.uniq 
    watch(%r{public/.+\.(#{compiled_exts * '|'})}) 

    extensions.each do |ext, type| 
    watch(%r{ 
      (?:app|vendor) 
      (?:/assets/\w+/(?<path>[^.]+) # path+base without extension 
      (?<ext>\.#{ext})) # matching extension (must be first encountered) 
      (?:\.\w+|$) # other extensions 
      }x) do |m| 
     path = m[1] 
     "/assets/#{path}.#{type}" 
    end 
    end 

    # file needing a full reload of the page anyway 
    watch(%r{app/views/.+\.(#{rails_view_exts * '|'})$}) 
    watch(%r{app/helpers/.+\.rb}) 
    watch(%r{config/locales/.+\.yml}) 
end 

guard 'zeus' do 
    require 'ostruct' 

    rspec = OpenStruct.new 
    # rspec.spec_dir = 'spec' 
    # rspec.spec = ->(m) { "#{rspec.spec_dir}/#{m}_spec.rb" } 
    # rspec.spec_helper = "#{rspec.spec_dir}/spec_helper.rb" 

    # matchers 
    # rspec.spec_files = /^#{rspec.spec_dir}\/.+_spec\.rb$/ 

    # Ruby apps 
    ruby = OpenStruct.new 
    ruby.lib_files = /^(lib\/.+)\.rb$/ 

    # watch(rspec.spec_files) 
    # watch(rspec.spec_helper) { rspec.spec_dir } 
    # watch(ruby.lib_files) { |m| rspec.spec.call(m[1]) } 

    # Rails example 
    rails = OpenStruct.new 
    rails.app_files = /^app\/(.+)\.rb$/ 
    rails.views_n_layouts = /^app\/(.+(?:\.erb|\.haml|\.slim))$/ 
    rails.controllers = %r{^app/controllers/(.+)_controller\.rb$} 

    # watch(rails.app_files) { |m| rspec.spec.call(m[1]) } 
    # watch(rails.views_n_layouts) { |m| rspec.spec.call(m[1]) } 
    # watch(rails.controllers) do |m| 
    # [ 
    #  rspec.spec.call("routing/#{m[1]}_routing"), 
    #  rspec.spec.call("controllers/#{m[1]}_controller"), 
    #  rspec.spec.call("acceptance/#{m[1]}") 
    # ] 
    # end 
end 

我使用此设置宙斯，而不是春季。

运行guard

打开本地主机：3000，你是好去。

这应该可以解决您的问题，并且具有比browserify更好的重载时间。

如果你想要，你可以取消注释那些行，如果你正在做TDD，