title: How to get GAE's row id?
body: <p>Here is my table in Google App Engine:</p>
  
  <pre><code>class Article:
      title = db.StringProperty(required=True)
      text = db.TextProperty(required=True)
      created = db.DateTimeProperty(auto_now_add=True)
  </code></pre>
  
  <p>Then I render this to front:</p>
  
  <pre><code>articles = db.GqlQuery("SELECT * FROM Article ORDER BY created DESC")
  self.render("index.html", articles=articles)
  </code></pre>
  
  <p>And How can I get this row's id ?Like this:</p>
  
  <pre><code>{% for article in articles %}
  {{ article.id }}
  {% endfor %}
  </code></pre>