#18979: PermWrapper + template "if in" interaction
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Reporter: akaariai | Owner: akaariai
Type: Bug | Status: new
Component: Template system | Version: 1.4
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by akaariai):
* owner: nobody => akaariai
* stage: Unreviewed => Accepted
Comment:
An irc-discussion with Alex, and the reason for this is now clear. The
reason is that if there isn't `__iter__` defined for an object, but it has
a `__getitem__` which never raises !IndexError, then the 'something' in
obj will continuously check for obj[i] == 'something'; i++...
The solution is to define an `__iter__` which raises !TypeError.
I am assigning this to myself. The only question is how to test this... A
possible test would be to check False not in perms - the reason is that
`__getitem__` will return False for the first index, 0, and then the in
check will see False in the perms incorrectly. And, there should be no
possibility of forever-loop.
I am going to backpatch this to 1.4, too.
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Ticket URL: <https://code.djangoproject.com/ticket/18979#comment:2>
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