title: Ext js Model validation is throwing Error
body: <p>I am trying to validate my model using record.getValidation()  <code>Uncaught TypeError: factory is not a function(…)</code></p>
  
  <p>Below is my code and Ext js verison is 6.0.2</p>
  
  <pre><code>Ext.define('Student', {
      extend: 'Ext.data.Model',
      idProperty: 'Id',
      fields: [{
              name: 'Id',
              type: 'int'
          },
          'firstName',
          'lastName'
      ],
      validators: {
          firstName: 'presence',
          lastName: {
              type: 'length',
              min: 2
          }
      }
  
  });
  var studentRecord = Ext.create('Student', {
      firstName: '',
      lastName: 'J'
  });
  
  var validation = studentRecord.getValidation();
  </code></pre>
  
  <p>the above line is causing error getting factory is not a function. Kindly help me .</p>