Is this worthy of a ticket?
Observed behavior: Django (v0.96) render_to_response renders a
template but renders nothing for {{ form.as_table }} tag when
(unbeknownst to the poor programmer) a TypeError exception is raised
during the rendering of a custom newforms widget.
My preferred behavior: generate a traceback message in the browser
There may be other kinds of exceptions that result in this behavior as
well, I am only sure of this one. I spent many frustrating hours
(granted the frustrating hours were my own fault; I am unfamiliar with
Django & python debugging) trying to debug my custom fields and
widgets when render_to_response would simply not output any HTML for
the form, and encountered several different bugs along the way through
brute force trial and error.
My breakthrough came when I stopped hoping for a traceback in the
browser and set a breakpoint in Wing and then used the debug probe to
print the form. I had a bug in one of my custom widgets for newforms
that resulted in a "TypeError: unsubscriptable object". I could have
discovered it through python manage.py shell also. I readily admit my
frustration was of my own making, and the form being absent in the
browser was certainly a big tip-off that something was wrong.
But isn't the suppression of exceptions like this (particularly in
debug mode) non-desired behavior?
>>> print myform
Traceback (most recent call last):
File "/usr/local/django/terry/ean/views/news.py", line 1, in ?
# views for news items
File "/usr/lib/python2.4/site-packages/django/newforms/util.py",
line 26, in __str__
return self.__unicode__().encode(settings.DEFAULT_CHARSET)
File "/usr/lib/python2.4/site-packages/django/newforms/forms.py",
line 73, in __unicode__
return self.as_table()
File "/usr/lib/python2.4/site-packages/django/newforms/forms.py",
line 144, in as_table
return self._html_output(u'<tr><th>%(label)s</th><td>%(errors)s%
(field)s%(help_text)s</td></tr>', u'<tr><td colspan="2">%s</td></tr>',
'</td></tr>', u'<br />%s', False)
File "/usr/lib/python2.4/site-packages/django/newforms/forms.py",
line 129, in _html_output
output.append(normal_row % {'errors': bf_errors, 'label': label,
'field': unicode(bf), 'help_text': help_text})
File "/usr/lib/python2.4/site-packages/django/newforms/forms.py",
line 227, in __unicode__
value = self.as_widget(self.field.widget)
File "/usr/lib/python2.4/site-packages/django/newforms/forms.py",
line 252, in as_widget
return widget.render(self.html_name, data, attrs=attrs)
File "/usr/local/django/terry/custom_widgets.py", line 75, in render
if not new_attrs.has_key['id']:
TypeError: unsubscriptable object
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