http://stackoverflow.com/questions/42710878/how-to-override-peek-method-in-ember-data

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

models.user.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";

export default Model.extend({
  name:DS.attr('string') ,
  deleted:DS.attr('bool'),
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  init(){
    this._super(...arguments);
    this.store.createRecord('user',{name:'name1',deleted:true});
    this.store.createRecord('user',{name:'name2',deleted:false});
    this.store.createRecord('user',{name:'name3',deleted:true});
  },
  model(){
    return this.store.peekAll('user');
  }
});

services.store.js

import Ember from 'ember';
import DS from 'ember-data'
export default DS.Store.extend({
  init(){
    console.log('init my store');
    return this._super(...arguments);
  },
  peekAll(modelName){
    let liveRecordArray = this._super(...arguments);
    console.log(' liveRecordArray ',liveRecordArray);
    if(Ember.isEqual(modelName,'user')){
      liveRecordArray = liveRecordArray.filterBy('deleted',true);
    }
    return liveRecordArray;
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{#each model as |row|}}
 {{row.name}}
 {{/each}}
<br>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.11.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.11.0",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.11.0",
    "ember-testing": "2.11.0"
  },
  "addons": {}
}