rails5 beta版已经发布，引入的新特性即为cable，是一个封装过的websocket客户端/服务器端工具，railscasts-china 上有一个dhh的rails5 cable介绍的视频，按部就班地实现了下，感觉rails5非常强大~
1 安装 rails5
gem install rails -v 5.0.0.beta1
2 rails new campfire创建项目
3 创建 room channel
使用命令 rails g channel room 创建 room_channel.rb和rooms.coffee
room_channel.rb
class RoomChannel < ApplicationCable::Channel
def subscribed
stream_from "room_channel"
end
def unsubscribed
# Any cleanup needed when channel is unsubscribed
end
#处理websocket请求
def speak(data)
Message.create! content: data['message']
end
end
rooms.coffee
App.room = App.cable.subscriptions.create "RoomChannel",
connected: ->
disconnected: ->
received: (data)->
$("#messages").append data['message']
#js 使用websocket发送信息
speak: (message)->
@perform 'speak',message:message
$(document).on 'keypress','[data-behavior~=room_speaker]', (event)->
if event.keyCode is 13
App.room.speak event.target.value
event.target.value = ''
event.preventDefault()
message.rb
#貌似不再是AcativeRecord::Base了
class Message < ApplicationRecord
#使用 job广播
after_create_commit { MessageBroadcastJob.perform_later self }
end
message_broad_cast_job.rb
class MessageBroadcastJob < ApplicationJob
queue_as :default
def perform(message)
#广播
ActionCable.server.broadcast "room_channel",message:render_message(message)
end
private
def render_message(message)
ApplicationController.renderer.render(partial:'messages/message',locals:{message:message})
end
end
从示例来看通过cable使用websocket是相当方便，rails 5你值得尝试~
示例代码:[https://github.com/secondrocker/campfire]
视频地址:[http://railscasts-china.com/episodes/action-cable-rails-5?autoplay=true]
