title: hasMany auto relation in ext JS 6
body: <p>I'm trying to implement a simple parent children relation in the same entity with Ext js 6, where I will receive all the information in the JSON. It is working fine for the parent but I'm not able to display the children in the grid. I guess it is something really simple and the error should be in the model:</p>
  
  <pre><code>Ext.define('hashmanytest.model.Person', {
  extend: 'Ext.data.Model',
  alias: 'model.Person',
  
  
   hasMany: {
      model: 'hashmanytest.model.Person',
      name: 'childs',
      associationKey: 'childs'
   },
  
  
  
  fields: [
      { name:'name' , type:'string' },
      { name:'email' , type:'string' },
      { name:'phone' , type:'string' },
      { name:'id' , type:'string' },
      { name: 'parent', reference: 'hashmanytest.model.Person'}
  ]
  });
  </code></pre>
  
  <p>Or in the store:</p>
  
  <pre><code>Ext.define('hashmanytest.store.Personnel', {
  extend: 'Ext.data.Store',
  
  alias: 'store.personnel',
  
  model: 'hashmanytest.model.Person',
  
  data: { items: [
      { name: 'Jean Luc', email: "jeanluc.picard@enterprise.com", phone: "555-111-1111", id:1, parent: {}, childs: [
          { name: 'Worf',     email: "worf.moghsson@enterprise.com",  phone: "555-222-2222", id:2},
          { name: 'Deanna',   email: "deanna.troi@enterprise.com",    phone: "555-333-3333", id:3},
          { name: 'Data',     email: "mr.data@enterprise.com",        phone: "555-444-4444", id:4}
      ]},
      { name: 'Worf',     email: "worf.moghsson@enterprise.com",  phone: "555-222-2222", id:2, parent:{ name: 'Jean Luc', email: "jeanluc.picard@enterprise.com", phone: "555-111-1111", id:1}, childs: []},
      { name: 'Deanna',   email: "deanna.troi@enterprise.com",    phone: "555-333-3333", id:3, parent:{ name: 'Jean Luc', email: "jeanluc.picard@enterprise.com", phone: "555-111-1111", id:1}, childs: []},
      { name: 'Data',     email: "mr.data@enterprise.com",        phone: "555-444-4444", id:4, parent:{ name: 'Jean Luc', email: "jeanluc.picard@enterprise.com", phone: "555-111-1111", id:1}, childs: []}
  ]},
  
  proxy: {
      type: 'memory',
      reader: {
          type: 'json',
          rootProperty: 'items'
      }
  }
  });
  </code></pre>
  
  <p>Anyway I created a fiddle with the implementation:
  <a href="https://fiddle.sencha.com/#fiddle/11gr" rel="nofollow">https://fiddle.sencha.com/#fiddle/11gr</a></p>
  
  <p>Any help would be really appreciated</p>