https://blog.mattblair.co/tags/properties/ Recent content in properties on A Place for Poor Examples Hugo -- gohugo.io en Fri, 11 Jul 2014 00:00:00 -0700 https://blog.mattblair.co/blog/20140711-ember-data-promise-aware-properties/ Fri, 11 Jul 2014 00:00:00 -0700 https://blog.mattblair.co/blog/20140711-ember-data-promise-aware-properties/ I have models like this: Models App.Child = DS.Model.extend({ parent: DS.belongsTo('parent', {async: true}) }); App.Parent = DS.Model.extend({ children: DS.hasMany('child', {async: true}) }); App.Nursery = DS.Model.extend({ children: DS.hasMany('child') }); Then a controller like this: ###Controller App.NurseryController = Ember.Controller.extend({ uniqueParents = function() { return this.get('children').mapBy('parent').uniq(); }.property('children'), somethingLikeReliesOnUniqueParents = function() { .... }.property('uniqueParents') } The Problem The property somethingLikeReliesOnUniqueParents was never getting unique values. I found two problems here: uniq() couldn’t figure out uniqueness - much like the problems with filter.