#2008: Negative offset in DB query set array-slicing fails silently
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Reporter: [EMAIL PROTECTED] | Owner: adrian
Type: defect | Status: new
Priority: normal | Milestone:
Component: Database wrapper | Version: SVN
Severity: normal | Keywords:
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Ordinary Python array-slicing allows negative offsets to indicate
accessing items from the end of an array, e.g.
{{{
l = ["foo", "bar", "baz"]
l[-1] <- returns "baz"
l[-2] <- returns "bar"
}}}
The same apparently does not work for querysets if they are not evaluated.
Instead it fails silently. I've looked up the reference for select
statements in SQLite and MySQL without finding anything obvious to remedy
the problem, other than to reverse the ordering if present. But at least
Django should give an error and not fail silently.
I'm using the syntax to extract the first and the last item of a sequence
to summarize a larger set of items.
--
Ticket URL: <http://code.djangoproject.com/ticket/2008>
Django <http://code.djangoproject.org/>
The web framework for perfectionists with deadlines.
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