title: Extjs adding a idproperty to fields defined in a store
body: <p>I'm setting my fields directly in the store configuration.</p>
  
  <pre><code>Ext.define('T.store.Users', {
      extend: 'Ext.data.Store',
  
      autoLoad: false,
  
      fields: [
          { name: 'Id', type: 'int' },
          { name: 'Name', type: 'string' }
      ]
  });
  </code></pre>
  
  <p>Is it possible to set somehow an idProperty for these fields direct in the store ? The only option I see is to create a separate model class containing a idProperty. But I'd like to avoid this.</p>