在灰烬路线中将哈希用于模型时未保留模型对象

Question

EDIT: I've set up an actual repro of the issue on JSBIN

Been trying to resolve this for a while now and I'm clearly not understanding how the relationship between model and setupController works. I have a model which is returning a hash; the result of two find calls:

model(params) {
  return Ember.RSVP.hash({
    course: this.store.find('course', params.course_id),
    topics: this.store.find('topic', { course_id: params.course_id })
  });
},

The first time setupController gets called, the value of model if as expected, a hash like { course: <Class>, topics: <Class> } . Awesome, that's what I want.

However, the next time setupController gets called (for example, transition to another route and then press the back button in the browser), the model is now just the course <Class> :

setupController(controller, model) {
    // when first called model will be { course: <Class>, topics: <Class> }
    // next time entered, model will just be <Class> (just the value of "course" )
    // why is the model object not preserved?
   controller.set('model', model.course);
   controller.set('topics', model.topics);
}}

If I just make model() return a single resource, it's the same every time:

model(params) { return this.store.find('course', params.course_id); }
// now `model` will always be "course" in setupController

Why is the original model not preserved when using a hash result? Am I doing something wrong?

Answer 1

You're sending the model color when you're linking here:

{{#link-to 'color' color}}{{color.name}}{{/link-to}}

Because of that, the model hooks aren't run. If you change that to color.id, it'll work.

It's mentioned here .

In the above example, the model hook for PhotoRoute will run with params.photo_id = 5. The model hook for CommentRoute won't run since you supplied a model object for the comment segment. The comment's id will populate the url according to CommentRoute's serialize hook.

Answer 2

Looking at it, the original model will not be preserved because on setupController, you are calling controller.set('model', model.course). When it first loads, its called the model(params {} function appropriately, but on back button transitions and certain {{link-to}} calls, that isn't always the case.

In your setupController, try changing it to controller.set('course', model.course); , that way you aren't overwriting your model on execution as well and it will always be able to find it.