Google app engine ReferenceProperty relationships

Question

I\'m trying to get my models related using ReferenceProperty, but not have a huge amount of luck. I have 3 levels: Group, Topic, then Pros, and Cons. As in a Group houses ma

Answer 1

I'm not quite sure what problem you're having. Everything you list looks fine - the ReferenceProperties are set up according to what one would expect from your dscription. The only problem I can see is that in your template, you're referring to a variable "topics", which isn't defined anywhere, and you're not iterating through the topics for a group anywhere. You can do that like this:

  
    New Group
    

    {% for group in groups %}

    {{ group.group_name|escape }}
 by {{ group.group_user }} at {{ group.group_date }} {{ group.raw_id }}
    

    New topice 
    

    Topics:
    

      {% for topic in group.topics %}
        
{{topic.topic_name}}
      {% endfor %}
    
    {% endfor %}
  

To create a new topic, just use the constructor, passing in the required arguments:

mytopic = Topic(topic_name="foo", topic_group=somegroup)

Here, somegroup should be either a Group object, or a key for a Group object.