Rails-我可以从ActionCable coffeescript中调用控制器方法吗？

Question

I'm building a quiz app that leads all participants synchroneously through multiple stages:

1. Phase 0: Quiz has not started
2. Phase 1: Current question is being displayed
3. Phase 3: Result for current question (correct answer vs given answer, statistics etc.) is being displayed
4. Phase 4: Result for entire quiz is being displayed

If a participant loses his connection and reconnects, I want them to be able to immediately pick up where they left off.

I always save the current phase to the db. So I'm thinking of calling a method show_current_phase(curent_user) in the connected method of my ActionCable channel. Since I feel like it would make sense to place this method in the corresponding controller for my custom QuizSession model, I'd like to know:

Is it possible to call a controller method in my coffeescript (frontend) and have it return an object?

Or how do I update the DOM tree of only the user who reconnected without broadcasting to all the other participants?

Answer 1

You can just turning your .coffee file into an .haml or .erb template.

.erb example with js

# myscript.js
var myPath = '/some_path';

Will become

# myscript.js.erb
var myPath = <%= some_controller_path %> ;

.haml example with coffee

In case you are using haml , the process is not really different.

# myscript.coffee
myPath = '/some_path'

Will become

# myscript.coffee.haml
myPath = '#{ some_controller_path }'

Obviously, you can create .js.haml and .coffee.erb files as well.

In your case, you could have something like this in your .coffee.haml :

myFunction = ->
  res = $.ajax(
    url: '#{method_controller_path}'
    method: 'GET'
    data:
      variableParam: '#{@my_controller_var}'
      anotherParam: 'anotherParam'
    dataType: 'json'
    success: (res) ->
      res
  )
  doSomething res