Opened 17 years ago

Last modified 16 years ago

#6558 closed

Need error message when inheriting from empty template — at Initial Version

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

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".


Environment:

Request Method: GET
Request URL: http://localhost:8081/pubs/
Django Version: 0.97-pre-SVN-7092
Python Version: 2.5.0
Installed Applications:
['django.contrib.auth',

'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'dubweb.polls',
'dubweb.pubs',
'django.contrib.admin']

Installed Middleware:
('django.middleware.common.CommonMiddleware',

'django.contrib.sessions.middleware.SessionMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.middleware.doc.XViewMiddleware')

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>

Traceback:
File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/template/debug.py" in render_node

  1. result = node.render(context)

File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/template/loader_tags.py" in render

  1. while isinstance(compiled_parent.nodelist[pos], TextNode):

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

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