title: How do get the ID field in App Engine Datastore?
body: <p>Say I have a blog on Google AppEngine and wants to print out the id of each post through jinja2.</p>
  
  <pre><code>blog = db.GqlQuery('SELECT * FROM Blog')
  
  self.render('blog.html', blog = blog)
  </code></pre>
  
  <p>and in the template: </p>
  
  <pre><code>{{% for b in blog %}}
  {{b.id}}
  {{% endfor %}}
  </code></pre>
  
  <p>Now I havent added an 'id' field to my DB model, I just want to access the build in datastore ID field. How do I do that?</p>