Opened 4 years ago
Last modified 4 years ago
#31459 closed Cleanup/optimization
URL path parameter regex too lenient — at Initial Version
| Reported by: | Adam Johnson | Owned by: | nobody |
|---|---|---|---|
| Component: | Core (URLs) | Version: | dev |
| Severity: | Normal | Keywords: | |
| 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
A [user on the Django forum](https://forum.djangoproject.com/t/noreversematcherror-path-and-args-vs-kwargs/1923) tried to configure a URL like books/<int:book.id>/. This was successfully parsed as a URL, but no converters applied.
This is because the left hand side of the regex for finding path parameter syntax looks for converter names with "anything not a colon or >". But the right hand side matches only word characters.
If we matched "anything not a >", then the attempted parameter would have been matched, and "book.id" would have hit the guard we have for invalid identifiers, with a message like:
"URL route 'books/<int:book.id>/' uses parameter name 'bookid' which isn't a valid Python identifier."