Basic google app engine (python) templating issue

Question

Hi, after going through some basic tutorials on the app engine and the webapp framework, I'm attempting to display documents that are related to a project construct I've created (e.g {% ifequal project.key doc.parentproject %} ) I have created several documents that do indeed have a doc.parentproject identical to keys from the project, but somehow this for loop never runs. If I substitute project.key for an actual project key value, then it returns true for those specific kets. Is there some basic templating thing I'm missing here? I haven't been able to find any answers on google or the django site (webapp uses the django templating engine). Any help would be appreciated.

Sorry if this is basic newb material...

{% for project in projects %}
  <blockquote>  
<div style="border:1px solid #999; padding:20px;">  
<h3>{{ project.projectname|escape }} </h3>

<h5>{{ project.key }}</h5>

    <table border="1" cellpadding="5" cellspacing="0" width="600">
        <tr>
            <td>Doc Feed Name</td>
            <td>Feed author</td>
            <td>Spreadsheet URL</td>
            <td>Parent Project Key</td>
            <td>Created on</td>
            <td>&nbsp;</td>
        </tr>

    {% for doc in docs %}
        {% ifequal project.key doc.parentproject %}
            <tr>
                <td>doc name:{{ doc.name|escape }}</td>
                <td>{{ doc.author }}</td>
                <td>{{ doc.link }}</td>
                <td>{{ doc.parentproject }}</td>
                <td>{{ doc.date }}</td>
                <td>Delete</td>
            </tr>
        {% endifequal %}
    {% endfor %}
    </table>

{% endfor %}

Answer 1

Without seeing the controller code that provides the values to this template, it is difficult to really diagnose the problem that you are having, but I would guess that the docs variable isn't getting the list of doc entities that it clearly expects.

From a good design standpoint, I would suggest giving the Project entity a property that contains a list of the docs that are associated with it. It looks like each doc is dependent on a parent project, so it would be cleaner and easier to have this code:

 {% for doc in project.docs %}
   ...do my rendering here...
 {% endfor %}

than what you have.

Answer 2

If a "doc" is an entity, and "parentproject" is a ReferenceProperty on that entity, the problem here is that you're attempting to compare a Key with an entity (ReferenceProperties automatically resolve their references). You need to use this instead:

{% ifequal project.key doc.parentproject.key %}