ember computed property based on model properties

0
votes

I'm quite new to ember and trying to write a computed property that checks whether or not a user is online based on their 'state' property, defined in the user model, and then returns a count of the number of users online. This is what I have been attempting, which is not working-

onlineUsers: function() {
    return this.get("model").filterBy("state", "online").get("model.length");
}.property("'model.[]'"),

And this is my user model-

App.User = DS.Model.extend({
  name   : DS.attr('string'),
  email  : DS.attr('string'),
  state  : DS.attr('string'),
  subjects    : DS.hasMany('subject')    
});

Can anyone point out what I'm doing wrong?

1
ember.jsember-data

1 Answers

2
votes

You need to use [email protected]

onlineUsers: function() {
  return this.get("model").filterBy("state", "online").get("length");
}.property("[email protected]"),

Also model.length in the end not work, because the result of the filterBy is a new array, and you want the length of that array.