Ember chooses two-way synchronization with queryParams emberjs

Question

I'm syncing queryParams with ember choices is what I have in mind.

• The user can select the parameter in ember.select -> queryParams should be updated.

• The user copies / pastes the URL using some Param -on pageload request. Ember.select should show the corresponding option

• The sortAscending property can be mapped to order. I can reach part 2. Now I am confused how to reach part 1 of JSB i N

  App.ApplicationController = Ember.Controller.extend({
    queryParams: ['sortBy'],
    sortBy: '',
    selectedOption: { id: 2 },
    options: [
     { id: 1, name: 'relevance', value: 'relevance' , order: true },
     { id: 2, name: 'First Name', value: 'firstName' , order: true }
    ],
  
    sortByDidChange: function(){
      options = this.get('options').findBy('value',this.get('sortBy'));
      console.log('optionid = '+options.id );
      this.set('selectedOption.id',options.id);
      console.log('selectedoption = '+this.get('selectedOption.id')); 
    }.observes('sortBy'),
  
    actions: {
      change: function(){
        this.set('selectedOption.id',2);
      }
    }
  });
  

** UPDATES 2 **

sortBySelection: function(){
    var sortByOptions= this.get('sortByOptions');
    var selection =  sortByOptions.findBy('value',this.get('sortBy')) || {id: 1} ;
    return selection ;
 }.property('sortBy'),

View

{{view Ember.Select 
    content=sortByOptions
    optionLabelPath='content.name'
    optionValuePath='content.id'
    selection = sortBySelection
    classNames='pull-right'
  }}

mixin sortBySelection Ember.Select sortByOptions (.. {id: 1, value: price, order: true}). undefined, Ember.select . (I) ,

sortByOptionsDidChange: function(){
    console.log(this.get('sortBySelection')); // <++++++++ undefinded ??
    var sortBy = this.get('sortBySelection.value') || 'relevance';
    var OrderBy = this.get('sortBySelection.order') && true;
    this.set('sortProperties',[sortBy]);
    this.set('sortAscending',OrderBy);
  }.observes('sortBySelection'),

** U P D A T E S 1 ** , , . , . , .