[英]More than one params with Rails 5 Action Cable
大卫有一个关于如何使用Action Cable for Rails 5的精彩视频 ,对我而言,我在Rails 5上使用的是beta 3版本。
问题是,Action Cable仅适用于只有一个参数作为data
传递的聊天应用吗? 我可以通过一个以上的参数speak
吗?
RoomChannel(咖啡):
App.room = App.cable.subscriptions.create "RoomChannel",
connected: ->
# Called when the subscription is ready for use on the server
disconnected: ->
# Called when the subscription has been terminated by the server
received: (data) ->
alert data['message']
# Called when there's incoming data on the websocket for this channel
speak: (message) -> # Could I pass in more than one params?
@perform 'speak', message: message
room_channel.rb:
# Be sure to restart your server when you modify this file. Action Cable runs in a loop that does not support auto reloading.
class RoomChannel < ApplicationCable::Channel
def subscribed
stream_from "room_channel"
end
def unsubscribed
# Any cleanup needed when channel is unsubscribed
end
def speak(data)
ActionCable.server.broadcast 'room_channel', message: data['message']
end
end
如果我可以通过一个以上的参数,它在哪里适合:
App.room.speak("foo bar"); # one param so far here.
编辑:
我现在收到两个对象的警报: [object object]
App.room.speak(
{
data1: "Data 1 mate",
data2: "Data 2 mate"
}
)
room.coffee:
received: (data1, data2) ->
alert data1['message']
room_channel.rb:
def speak(data1, data2)
ActionCable.server.broadcast 'room_channel', message: data1['message'], data2['message']
end
安慰:
RoomChannel#speak({"message"=>{"data1"=>"Data 1 mate", "data2"=>"Data 2 mate"}})
要将另一个参数传递给actioncable服务器,您可以传递Javascript对象。
然后在服务器端,此Javascript对象表示为哈希。
例:
客户端
App.room.speak(
{
param1: "Data 1 mate",
param2: "Data 2 mate"
}
)
服务器端
def speak(data)
ActionCable.server.broadcast 'room_channel', param1: data['param1'], param2: data['data2']
end
并回到客户端
received: (data) ->
alert data['param1']
alert data["param2"]
我想我现在可以回答这个问题了。 两个参数都被传递但是作为哈希。 在控制台中,您将看到两个参数,因此您需要从message
提取值。
保持speak
方法正常:
def speak(data)
ActionCable.server.broadcast 'room_channel', message: data['message']
end
您的receive
功能(咖啡)应如下所示:
received: (data) ->
alert(data.message.data1)
alert(data.message.data2)
您必须在广播呼叫上传递哈希,例如:
def broadcast_to_room_channel(title, message)
data = { title: title, message: message }
ActionCable.server.broadcast 'room_channel', data
end
我遇到了类似的情况,我需要传递相关的id
参数。 我使用了form_with
帮助器和数据属性,通过说话传递params来创建Post
的实例。 我发现这样的东西有效:
view.html.erb
<%= form_with(model: Post.new) do |f| %>
<div>
<%= f.text_area :content,
id: 'text',
data: { first_id: @first.id, second_id: @second.id } %>
</div>
<% end %>
chat_room.coffee
speak: (post) ->
firstId = document.getElementById('text').dataset.firstId
secondId = document.getElementById('text').dataset.secondId
@perform 'speak', post: post, first_id: firstId, second_id: secondId
chat_room_channel.rb
def speak(data)
Post.create! content: data['post'], first_id: data['first_id'], second_id: data['second_id']
end
重复你引用的同一个视频,我已经将broadcast
逻辑移动到一个worker,你将新创建的Post
实例广播到你通过ApplicationController.renderer
访问的部分。
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