On Monday, 8 August 2011 16:51:52 UTC+1, Josh wrote:
>
> I'm trying to create custom templatetags now, while learning Django. When
> an entry is displayed I want to list other entries with the same categories
> below the entry. I also wrote a templatetag (following the Practical Django
> Projects from James Bennet)
>
> I'm having problems with using a variable as input in a custom templatetag.
> The custom templatetag is:
>
> {% get_related_entries weblog.entry 5 from {{object.categories}} as
> related_entries %}
> {% for entry in related_entries %}
> <p><a href="{{ entry.get_absolute_url }}">{{ entry.title }}</a>
> {% endfor %}
>
>
> <snip>
>
I'm stuck now at the following error and the debug-information says:
>
> *Caught ValueError while rendering: invalid literal for int() with base
> 10: '{'*
>
>
> ../sandbox/lib/python2.6/site-packages/Django-1.3-py2.6.egg/django/db/models/fields/related.py
>
> in _pk_trace
> v = getattr(field, prep_func)(lookup_type, v, **kwargs) ...
> ../sandbox/lib/python2.6/site-packages/Django-1.3-py2.6.egg/django/db/models/fields/__init__.py
>
> in get_prep_lookup
> return self.get_prep_value(value) ...
> ../sandbox/lib/python2.6/site-packages/Django-1.3-py2.6.egg/django/db/models/fields/__init__.py
>
> in get_prep_value
> return int(value) ...
>
>
>
> It gets to the filter and gives an UTF error. The Postgres database is UTF8
> and I also explicitly added the *# -*- coding: utf-8 -**- in the
> django-file to be sure. I'm using Python 2.6.5 and Django 1.3
>
> I think I'm using the wrong approach with regard to the
> {{object.categories}} in the customtag. What am I doing wrong and how can I
> solve this?
>
>
The problem is your use of the variable tag delimiters inside another tag.
There's no reason for this: the general semantics of Django templatetags is
that inside them, the syntax is Python-like. For example, you do `{% for
category in object_categories %}`, not `{% for category in {{
object.categories }} %}`. So you should just refer to `object.categories`
directly:
{% get_related_entries weblog.entry 5 from object.categories as
related_entries %}
--
DR.
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