Opened 16 years ago

Closed 16 years ago

#6558 closed (fixed)

Need a better error message when inheriting from empty template

Reported by: toomim Owned by: nobody
Component: Template system Version: dev
Severity: Keywords:
Cc: oliver@… Triage Stage: Accepted
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description (last modified by Ramiro Morales)

If you inherit from a template with no blocks (for instance containing just the text "Hello"), you get the following error message:

"Caught an exception while rendering: list index out of range"

I don't know what is supposed to happen, or if this is supposed to be allowed, but it would at least be way better to have an error like "There are no blocks in the template foo."

This happens when it's traversing the nodes in the inherited template while rendering, and finds only a TextNode and no block nodes. I don't really know what the code here is trying to do.

Here's the traceback. In my code, "base.html" is the template that says "hello".



Request Method: GET
Request URL: http://localhost:8081/pubs/
Django Version: 0.97-pre-SVN-7092
Python Version: 2.5.0
Installed Applications:
Installed Middleware:

Template error:
In template /Users/toomim/projects/dubweb/dubweb/templates/pubs/index.html, error at line 1
   Caught an exception while rendering: list index out of range
   1 :  {% extends "pubs/base.html" %} 
   2 : 
   3 : {% block middlecontent %}
   4 : {% if venue_list %}
   5 : <ul>
   6 :   {% for venue in venue_list %}
   7 :   <li>Featured at {{ venue }}</li>
   8 :   <ul>
   9 :     {% for pub in venue.pub_set.all %}
   10 :     
   11 :     <li><b>{{ pub.title }}</b>

File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/template/" in render_node
  71.             result = node.render(context)
File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/template/" in render
  73.         while isinstance(compiled_parent.nodelist[pos], TextNode):

Exception Type: IndexError at /pubs/
Exception Value: list index out of range

Change History (6)

comment:1 by anonymous, 16 years ago

Cc: oliver@… added

comment:2 by James Bennett, 16 years ago

#6968 as a duplicate, but had a suggestion for code to solve the issue.

comment:3 by Jacob, 16 years ago

Summary: Need error message when inheriting from empty templateNeed a better error message when inheriting from empty template
Triage Stage: UnreviewedAccepted

comment:4 by Ramiro Morales, 16 years ago

Description: modified (diff)

comment:5 by Adi J. Sieker, 16 years ago

I can't duplicate this on r7732.
I have the templates:




{% extends "customers/layout2.html" %}
{% block content %}
Some content!!!
{% endblock %}

and the output is:


comment:6 by Karen Tracey <kmtracey@…>, 16 years ago

Resolution: fixed
Status: newclosed

Looks like this was fixed by #7318 (r7688).

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