On Sat, Apr 12, 2008 at 9:28 AM, Jonathan Lukens <[EMAIL PROTECTED]>
wrote:
>
> I started getting an IndexError on a page today that has worked fine
> in the past. The uses a wrapped object_list generic view to render a
> template with the following loop:
>
> {% for baby in object_list %}
> {% if baby.photo %}
> <p><img src="{{ baby.photo.get_thumbnail_url }}"
> /></p>
> {% endif %}
> <p>
> <a href="{{ baby.get_absolute_url }}">
> {{ baby.display_name }} {{ baby.last_name }}...</a>
> </p>
> <p>... is {{ baby.age }}</p>
> {% endfor %}
>
> I tried generating the same list in shell and was able to run a for
> loop on it without any trouble. I compared the model and the template
> with the last commit to svn (which worked) and nothing was different
> except a couple of custom methods on the model being looped over. I
> commented out those methods and restarted the server but got the same
> error. Here is the traceback:
>
> File "/usr/lib/python2.5/site-packages/django/template/debug.py" in
> render_node
> 71. result = node.render(context)
> File "/usr/lib/python2.5/site-packages/django/template/defaulttags.py"
> in render
> 149. nodelist.append(node.render(context))
> File "/usr/lib/python2.5/site-packages/django/template/defaulttags.py"
> in render
> 239. value = bool_expr.resolve(context, True)
> File "/usr/lib/python2.5/site-packages/django/template/__init__.py" in
> resolve
> 518. obj = self.var.resolve(context)
> File "/usr/lib/python2.5/site-packages/django/template/__init__.py" in
> resolve
> 659. value = self._resolve_lookup(context)
> File "/usr/lib/python2.5/site-packages/django/template/__init__.py" in
> _resolve_lookup
> 694. current = current()
This is the line of code causing the problem:
File "/home/jonathan/workspace/datababy/src/datababy/child/models.py"
> in photo
> 96. return self.photo_set.all()[0]
It is assuming there is at least one photo in the set, but apparently there
are none. This would seem to be coming from the {% if baby.photo %} line in
your template. Your code needs to handle the case where
self.photo_set.all() is empty.
Karen
> File "/usr/lib/python2.5/site-packages/django/db/models/query.py" in
> __getitem__
> 157. return list(self._clone(_offset=k,
> _limit=1))[0]
>
> Exception Type: IndexError at /users/jonathan/
> Exception Value: list index out of range
>
> >
>
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