Opened 18 years ago

Closed 13 years ago

#6170 closed Bug (fixed)

Reverse urlresolver raises obscure exceptions on failure

Reported by: abrahamson.j@… Owned by: nobody
Component: Core (Other) Version: dev
Severity: Normal Keywords: reverse urls exception 'unbalanced parenthesis'
Cc: Triage Stage: Ready for checkin
Has patch: yes Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description

Related to ticket #2977.

When reverse fails to reverse a complex regex obscure errors can be raised. For instance, reversing the url r'^(\d(\d)?)/$' causes an 'unbalanced parenthesis' to be raised from re.py._compile.

The urlresolver is clearly in flux right now; however, this error could be very difficult for someone new to Django (read, me) to understand. Better exception catching that notifies when a url isn't supported by reverse would be very helpful.

Attachments (2)

core_urlresovlers__better_error_message.diff​ (970 bytes ) - added by Thomas Güttler 18 years ago.
6170.diff​ (2.2 KB ) - added by David Gouldin 13 years ago.

Download all attachments as: .zip

Change History (10)

by Thomas Güttler, 18 years ago

Attachment: core_urlresovlers__better_error_message.diff​ added

comment:1 by Thomas Güttler, 18 years ago

Has patch: set
Triage Stage: Unreviewed → Accepted

I wrote a small patch to give a better error message. I remember, that I had this problem some time ago, too.

comment:2 by robertpeters@…, 17 years ago

I have never participated in a bug tracker before, but if it weren't for this ticket, I never would have figured out what was wrong. I vote for the new code to be added. It would have pointed me to the right place to fix my problem immediately.

comment:3 by Gabriel Hurley, 15 years ago

Severity: → Normal
Type: → Bug

comment:4 by Julien Phalip, 15 years ago

Easy pickings: unset
Needs tests: set

comment:5 by Aymeric Augustin, 14 years ago

UI/UX: unset

Change UI/UX from NULL to False.

by David Gouldin, 13 years ago

Attachment: 6170.diff​ added

comment:6 by David Gouldin, 13 years ago

Needs tests: unset

The original patch no longer made sense, so I wrote a new one and added a test. ImproperlyConfigured is probably a more descriptive exception for this issue than NoReverseMatch.

comment:7 by Jannis Leidel, 13 years ago

Triage Stage: Accepted → Ready for checkin

comment:8 by Julien Phalip <jphalip@…>, 13 years ago

Resolution: → fixed
Status: new → closed

In [1af0271d7c6f5ecda2247a2b363d25f493c7b05a]:

Fixed #6170 -- Ensured that a useful exception is raised when a regex is invalid in the URLConf.
Thanks to abrahamson.j for the report, to guettli for initial work on the patch, and to David Gouldin for the new patch and test.

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