title: Override django's RelatedManager for model
body: <p>How i can override manager for relations? For example:</p>
  
  <pre><code>user.entry_set # django.db.models.fields.related.RelatedManager
  </code></pre>
  
  <p>But i need for my own manager. I try this code, but this does not work:</p>
  
  <pre><code>class EntryManager(models.Manager):
      use_for_related_fields = True
  </code></pre>
  
  <p>Thanks.</p>