将新订阅添加到Rocket聊天

Question

我想在Rocket Chat中创建一个新的订阅，例如stream-all-messages，与stream-room-messages中的已经存在于文档中的订阅相同。

我正在使用DDP监听器来测试它，以下是我正在尝试的示例。

// Subscribe to a message stream from a channel or group
console.log("Attempting to subscribe to the Group/Channel now.\n");
ddpClient.subscribe("stream-room-messages", [RoomId, false], function() {
  console.log(ddpClient.collections);
  console.log("Subscription Complete.\n");
  // Display the stream on console so we can see its working
  console.log("\nStarting live-stream of messages.:\n");
  ddpClient.on("message", function(msg) {
    console.log("Subscription Msg: " + msg);
  });
});

上面的示例有效，因为stream-room-messages已经存在但是当我尝试执行以下操作时会引发错误，即

Subscription Msg: {"msg":"nosub","id":"2","error":{"isClientSafe":true,"error":404,"reason":"Subscription 'stream-only-messages' not found","message":"Subscription 'stream-all-messages' not found [404]","errorType":"Meteor.Error"}}

我称之为

// Subscribe to a message stream from a channel or group
console.log("Attempting to subscribe to the Group/Channel now.\n");
ddpClient.subscribe("stream-all-messages", [RoomId, false], function() {
  console.log(ddpClient.collections);
  console.log("Subscription Complete.\n");
  // Display the stream on console so we can see its working
  console.log("\nStarting live-stream of messages.:\n");
  ddpClient.on("message", function(msg) {
    console.log("Subscription Msg: " + msg);
  });
});

请帮我解答如何添加新订阅。