On 21 oct, 15:05, Peter Bengtsson <pete...@gmail.com> wrote:
> Suppose I've got this code:
>
> # template.html
> Info: {{ article_instance.count_words }} words
>
> # models.py
> class Article(models.Model):
> text = models.TextField()
> def count_words(self):
> raise AttributeError('debugging')
<hs> a NotImplementedError would be more appropriate !-) </hs>
> Then, when I render that page I get:
> Info: words
Did you actually tried with this exact code ? If yes, this contradicts
the FineManual(tm):
"""
If, during the method lookup, a method raises an exception, the
exception will be propagated, unless the exception has an attribute
silent_variable_failure whose value is True. If the exception does
have a silent_variable_failure attribute, the variable will render as
an empty string.
(...)
Note that django.core.exceptions.ObjectDoesNotExist, which is the base
class for all Django database API DoesNotExist exceptions, has
silent_variable_failure = True. So if you're using Django templates
with Django model objects, any DoesNotExist exception will fail
silently.
"""
http://docs.djangoproject.com/en/dev/ref/templates/api/#rendering-a-context
> When I want is a raised proper error so that I can spot the possible
> bug in my system. How do I do that?
Not tested, but this might be the answer:
http://docs.djangoproject.com/en/dev/ref/settings/#debug-propagate-exceptions
> If what you look up in the template doesn't exist I can accept that
> Django, currently, prefers to just suppress it
Actually, there's no "suppression", cf
http://docs.djangoproject.com/en/dev/ref/templates/api/#how-invalid-variables-are-handled
HTH
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