title: Get len of the ArrayField Postgres Django
body: <p>I've a model:-</p>
  
  <pre><code>class ModelA(models.Model):
      field1 = ArrayField(models.IntegerField())
  </code></pre>
  
  <p>I want to get the top10 objects of ModelA having maximum length of field1. I see that a <code>len</code> filter is available in <a href="https://docs.djangoproject.com/es/1.9/ref/contrib/postgres/fields/#len" rel="nofollow">Django Docs</a>, but that just does not serves my purpose.</p>
  
  <p>How can I get top10 objects having maximum length of field1?</p>