title: What is the compatible version of this query for NDB?
body: <p>Maybe it's wrong but I always use this query for my app:</p>
  
  <pre><code>cme_only = Comput.all().filter('__key__ =', cid.key())
  </code></pre>
  
  <p>What is the compatible version of this query for NDB?
  The Metadata queries are very different..</p>
  
  <p><strong>edit</strong>:
  cid is an entity and cme_only is an iterable that I'm sure has only one value</p>
  
  <pre><code>cid = Comput.get_by_id(int(self.request.get('id')))
  cme_only = Comput.all().filter('__key__ =', cid.key())
  </code></pre>
  
  <p>and then in template:</p>
  
  <pre><code>{{ for Comput in cme_only }}
  </code></pre>
  
  <p>I do not like it but it was enough</p>