#19616: QuerySet.__contains__ tries to check the length of a None
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Reporter: kalugny@… | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.4
(models, ORM) | Resolution:
Severity: Normal | Triage Stage:
Keywords: | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 1 | UI/UX: 0
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Comment (by anonymous):
Replying to [comment:1 Alex]:
> Can you actually reproduce this in any way? Calling `iter(self)` should
cause `_result_cache` to start being a list.
Yes, I noticed this because it happened to me.
The reproduction is a bit complex, though.
I used this snippet:
http://djangosnippets.org/snippets/1034/
And it happened when trying to iterate an empty QuerySet.
I naturally thought that this is a bug with me or the snippet, but looking
at the code it is pretty obvious that although the function expects that
_result_cache might be None it still tries to len() it.
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Ticket URL: <https://code.djangoproject.com/ticket/19616#comment:2>
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