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How to initialize a Controller’s computed property to model in Ember?

Asked By: Anonymous

I have a computed property myArray defined on an Ember controller that returns an array. The array should be initialized to the contents of model and then recompute by filtering model depending on a user-input query.

myArray: function() {
  // return a value that filters model with query
}.property('model', 'query')

The problem is that I can’t figure out how to do both at the same time. The below does not work to initialize myArray to model; I’m guessing because model is loaded asynchronously and init() runs before it’s finished.

// doesn't work
init: function() {
  this._super();
  this.set('myArray', this.get('model'));
}

So I thought that setupController() would be the place to set it, but I found that setting myArray there caused the filter update not to work, maybe because I was overwriting the definition.

// route definition...
setupController: function(controller, model) {
  controller.set('model', model);
  controller.set('myArray', model);  // breaks updating
}

How can I accomplish my goal?


Solution

Answered By: Anonymous

You want a computed property depending on model – you don’t have to initialize it, it just has to return the right thing.

// untested, just to show the idea
myArray: function() {
   var query = this.get('query');
   var model = this.get('model');

   if (query) 
      return doSomethingWith(model, query);
   else
      return model;
}.property('model', 'query')

Since it is a property, the initializing and updating will take place for itself.

That said, Twitter lore is that the usage of .property shall be discouraged, better use Ember.computed.

// untested, just to show the idea
myArray: Ember.computed('model', 'query', function() {
   var query = this.get('query');
   var model = this.get('model');

   if (query) 
      return doSomethingWith(model, query);
   else
      return model;
})

It’s just another way to write it, and may be mor future-proof in the long run.

techinplanet staff

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