Question

I have the following model:

class Messages(db.Model):
    name: db.StringProperty()
    ...

which uses the id field provided by the datastore of Google App Engine as a unique key, and it can be obtained by:

message = Message()
...
message.put()
...
id = message.key().id()

Now I would like to list the messages using the Django template system:

messages = db.Messages.all()
self.response.out.write(template.render('page.html', 'messages': messages))

And in the ‘page.html’:

{% for message in messages %}
   {{message.name}}
   {{message.id}}
   ....
{% endfor %}

However, the ‘message.id’ is always empty in the above loop. How to I pass the entity id’s to the template system such that I may use them in the web page? Thanks.

Answer 1

The template code is no different in that you still need to access the id instance-method of the key.

Try instead:

{% for message in messages %}
   {{ message.name }}
   {{ message.key.id }}
   <!-------- ^^^ -->
{% endfor %}

---

The syntax, if you use Jinja2 templates (instead of Django templates), would be:

{% for message in messages %}
   {{ message.name }}
   {{ message.key().id() }}
   <!-------- ^^^^^ -->
{% endfor %}