SO:http://stackoverflow.com/questions/42610375/emberjs-filter-hasmany-data-apply-to-belongsto-relationship

adapters.application.js

import DS from 'ember-data';

export default DS.RESTAdapter.extend({
  
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  
  
  refinedTeams: Ember.computed.filter('model.[]', function(team){
    return !team.get('players').isAny('status', 'injured');
  }),
  
  actions: {
    loadData(){
      this.set('model', this.store.peekAll('team'));
    }
  }
});

models.player.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":  attr('string'),
    "status": attr('string'),
    "team": DS.belongsTo('team',{
        async: true
    })
});

models.team.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": attr('string'),
    "players": DS.hasMany('player',{
        async: true
    })
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  init(){
    this._super(...arguments);
    
    const players = [
      {
        id: '1',
        name: 'Player 1',
        status: 'healthy',
        team: '1'
      },
      {
        id: '2',
        name: 'Player 2',
        status: 'healthy',
        team: '1'
      },
      {
        id: '3',
        name: 'Player 3',
        status: 'injured',
        team: '1'
      },
      {
        id: '4',
        name: 'Player 4',
        status: 'healthy',
        team: '2'
      },
      {
        id: '5',
        name: 'Player 5',
        status: 'healthy',
        team: '2'
      }
    ];
    
    const teams = [
      {
        id: '100',
      	name: 'Team 1',
        players: ['1', '2', '3']
      },
      {
        id: '200',
      	name: 'Team 2',
        players: ['4', '5']
      }
    ];
    
    this.store.pushPayload('player', {players: players});
    this.store.pushPayload('team', {teams: teams});
  },
  
  model(){
    return null;
    //return this.store.peekAll('team');
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<button {{action "loadData"}}>Load</button>
<br>
{{outlet}}
<br>
<br>
{{#each refinedTeams as |team index|}}
    <strong>{{team.name}}</strong><br>
    <em>Players</em>
    <ul>
    {{#each team.players as |player|}}
        <li>{{player.name}} - {{player.status}}</li>
    {{/each}}
    </ul>
{{/each}}

twiddle.json

{
  "version": "0.11.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.2",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.10.2",
    "ember-testing": "2.10.2"
  },
  "addons": {}
}