perform doesn't sent data properly?

[ArmandoPerdomo]

Hello,

I have a channel instanced in my angular app but i want to perform with action 'pull_items' in a ruby api with some data, but doesn't happend properly? or i really dont understand what is the porpose to perform method with the action param and data param.

Here look a example

const cable = this.cable.getActualCable(); const channel = cable.channel('ShoppingCartChannel'); channel.perform('push_items', 'some'); channel.perform('pull_items')

then the channel.connected()suscription must catch with a calback fn some data

when i debug with develop tools in chrome i see my other channel doing the perform correctly like this {"command":"message","identifier":"{\"channel\":\"NotificationChannel\"}","data":"{\"action\":\"unreads\"}"}

and 'push_items'

{"command":"message","identifier":"{\"channel\":\"ShoppingCartChannel\"}","data":"\"some\""}

I see a difference between to logs in the key data

then what should i do?

I appreciate your understanding

[ArmandoPerdomo]

I run some tests, then i tried

channel.perform('push_items', JSON.parse({"action": "push_items", "data": ${JSON.stringify(data)} }));

and it works!, but i think, is not an optimal solution

this.channel.send({action: "push_items", data: data });

here is other solution

[nolancaster]

To be honest, I've never actually used the perform method but added it as a pass through since it's part of the Action Cable API. Looking at the implementation of the perform method in Action Cable I see:

// Perform a channel action with the optional data passed as an attribute
  perform(action, data = {}) {
    data.action = action
    return this.send(data)
  }

So it looks like your data argument needs to be an object instead of a string and your 'push_items' action is getting lost since it can't be added as a property to the 'some' string you're supplying. I should probably change the type of the data parameter to be object instead of any since it doesn't look like primitives will work.

[MariaNSe]

Hi! I have a chat where every dialogs connect the same channel name but diff param - id. And I wanna send a new message to current channel but I got an error.

 ERROR TypeError: Cannot read property 'send' of undefined
    at Channel.send (angular2-actioncable.js:5696)

I use method "send" like this:

const cable = this.cableService.cable(environment.WS_ENDPOINT);
 const chatChannel = cable.channel('ChatChannel', {id : this.id });
 chatChannel.send({newMessageData});

Maybe you also have received this error. I will be grateful for your help!

[nolancaster]

@MariaNSe I don't think you're connected to the channel in time to call send. You can trying subscribing to chatChannel.connected() and calling send within your callback.

[MariaNSe]

Thank you for the answer! It helped me. Yeah, I really didn't connected to the channel but cause it was wrong channel name 🙈 I connect to the channel in ngOnInit() and it works when I call send().