id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
12820	for param in request.REQUEST fails with (a misleading) KeyError exception	Tamas Szabo	nobody	"If you do a ""for param in"" on request.POST or request.GET it works as expected, but if you do it on request.REQUEST it fails.

The following simple code

{{{ 
for param in request.REQUEST:
    print param
}}}

will throw a KeyError exception! A few WTFs later I realized that the problem is in django.util.datastructures.MergeDict, that doesn't implement __iter__, but it does implement __getitem__ so the for calls into __getitem__ and passes in 0 (index of first element in a sequence).
0 won't be a valid key in request.GET or request.POST so a KeyError is thrown by the MergeDict.__getitem__ implementation.

I've attached a patch that adds the missing __iter__ method.


"		closed	Core (Other)	dev		fixed			Accepted	1	0	0	0	0	0