【发布时间】：2018-02-08 19:38:26
【问题描述】：
似乎几个月来，我一直在努力研究动作电缆。请帮忙。
我有一个“连接” - 我无法设置 identified_by :current_user，因为此端点还需要由使用 WebSockets 的外部 API 使用。无法使用浏览器 cookie 来验证 API 端点。
文件和支持
连接：/app/channels/application_cable/connection.rb
module ApplicationCable
class Connection < ActionCable::Connection::Base
end
end
频道：/app/channels/application_cable/channel.rb
module ApplicationCable
class Channel < ActionCable::Channel::Base
end
end
我有一个特定的访问频道：/app/channels/visits_channel.rb
class VisitChannel < ApplicationCable::Channel
def subscribed
stream_from "visit_#{params[:visit_id]}"
end
end
然后我有我的咖啡脚本频道：/app/assets/javascripts/channels/visit.coffee
App.visit = App.cable.subscriptions.create { channel: 'VisitChannel', visit_id: '42' },
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) ->
console.log data
push: ->
@perform 'push'
然后我的访问模型有回调：/app/models/visit.rb
class Visit < ApplicationRecord
after_save :push_to_action_cable
**** detail of model removed ****
def push_to_action_cable
ActionCable.server.broadcast("visit_#{self.id}", self)
end
end
这是完美的工作，它每次都将对象放入控制台，并且只有 ID 为 42 的对象
这是我的问题：
在coffeescript 频道中：位于/app/assets/javascripts/channels/visit.coffee - 我如何设置visit_id 以便仅在我想要的访问中“收听”更改？
App.visit = App.cable.subscriptions.create { channel: 'VisitChannel', visit_id: 'HOW_DO_I_SET_THIS?' },
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) ->
console.log data
push: ->
@perform 'push'
我尝试过的：
我已经尝试了各种变化，例如：
App.visit = App.cable.subscriptions.create { channel: 'VisitChannel', visit_id: <%= @visit.id %> }
结果：
ExecJS::RuntimeError in Visits#action_cable
Showing /Users/johnsalzarulo/code/uvohealth/app/views/layouts/application.html.erb where line #9 raised:
SyntaxError: [stdin]:1:81: unexpected <
和
App.visit = App.cable.subscriptions.create (channel: 'VisitChannel', visit_id: "#{ params[:id] }")
结果：
ExecJS::RuntimeError in Visits#action_cable
Showing /Users/johnsalzarulo/code/uvohealth/app/views/layouts/application.html.erb where line #9 raised:
SyntaxError: [stdin]:1:93: unexpected :
和
App.visit = App.cable.subscriptions.create (channel: 'VisitChannel', visit_id: "#{ @visit.id }")
结果：
visit.self-e04de4513d06884493c48f4065f94d23255be682f915e26766c54bb9d17ef305.js?body=1:4 Uncaught TypeError: Cannot read property 'id' of undefined
at visit.self-e04de4513d06884493c48f4065f94d23255be682f915e26766c54bb9d17ef305.js?body=1:4
at visit.self-e04de4513d06884493c48f4065f94d23255be682f915e26766c54bb9d17ef305.js?body=1:18
(anonymous) @ visit.self-e04de4513d06884493c48f4065f94d23255be682f915e26766c54bb9d17ef305.js?body=1:4
(anonymous) @ visit.self-e04de4513d06884493c48f4065f94d23255be682f915e26766c54bb9d17ef305.js?body=1:18
和
App.visit = App.cable.subscriptions.create (channel: 'VisitChannel', visit_id: "#{ visit.id }")
结果：
visit.self-b636f38376edc085c15c2cfc4d524bafc5c5163a8c136b80ba1dda12813fc0b5.js?body=1:4 Uncaught ReferenceError: visit is not defined
at visit.self-b636f38376edc085c15c2cfc4d524bafc5c5163a8c136b80ba1dda12813fc0b5.js?body=1:4
at visit.self-b636f38376edc085c15c2cfc4d524bafc5c5163a8c136b80ba1dda12813fc0b5.js?body=1:18
(anonymous) @ visit.self-b636f38376edc085c15c2cfc4d524bafc5c5163a8c136b80ba1dda12813fc0b5.js?body=1:4
(anonymous) @ visit.self-b636f38376edc085c15c2cfc4d524bafc5c5163a8c136b80ba1dda12813fc0b5.js?body=1:18
结束时
我尝试了更多的组合。唯一的工作就是将<script> 扔到显式订阅访问的那个页面的视图模板中，但是我没有得到回调的好处，而且我知道这不是“rails”大大地”。
阅读这些文档并尝试完成这项工作已经花费了数小时。任何人都可以阐明我在这里缺少的东西吗？
【问题讨论】：
-
有同样的问题！
标签： ruby-on-rails coffeescript ruby-on-rails-5 channel actioncable