#30151: last() and [] operator give different results
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Reporter: NMO13 | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 1.11
Severity: Normal | Resolution:
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Description changed by NMO13:
Old description:
> I have a model RSSFeed. To get the last element in my DB, I do:
>
> {{{
> RSSFeed.objects.last()
> # Output: <RSSFeed: www.sooperarticles.com>
> }}}
>
> I slice it to get the first 10 element in the query
>
> {{{
> first_ten_feeds = RSSFeed.objects.all()[:10]
> }}}
>
> Using first and the bracket operator is consistent:
>
> first_ten_feeds.first()
> # Output: <RSSFeed: pressetext News>
> first_ten_feeds[0]
> # Output: <RSSFeed: pressetext News>
>
> But using last and the bracket operator is not consistent:
>
> {{{
> first_ten_feeds[9]
> # Output: <RSSFeed: FinanzNachrichten.de: Nachrichten zu IT-
> Dienstleistungen>
>
> first_ten_feeds.last()
> # Output: <RSSFeed: www.sooperarticles.com>
> }}}
>
> Why? I expect to get the same result for last() and [] above.
>
>
> RSSFeed.objects.last() and first_ten_feeds.last()
>
> seem to give the same result but that does not make sense to me.
>
> I already openend a SO question with the same content:
> https://stackoverflow.com/questions/54477472/last-and-operator-give-
> different-results
> There I was suggested to open a bug.
New description:
I have a model RSSFeed. To get the last element in my DB, I do:
{{{
RSSFeed.objects.last()
# Output: <RSSFeed: www.sooperarticles.com>
}}}
I slice it to get the first 10 element in the query
{{{
first_ten_feeds = RSSFeed.objects.all()[:10]
}}}
Using first and the bracket operator is consistent:
first_ten_feeds.first()
# Output: <RSSFeed: pressetext News>
first_ten_feeds[0]
# Output: <RSSFeed: pressetext News>
But using last and the bracket operator is not consistent:
{{{
first_ten_feeds[9]
# Output: <RSSFeed: FinanzNachrichten.de: Nachrichten zu IT-
Dienstleistungen>
first_ten_feeds.last()
# Output: <RSSFeed: www.sooperarticles.com>
}}}
Why? I expect to get the same result for last() and [] above.
RSSFeed.objects.last() and first_ten_feeds.last() seem to give the same
result but that does not make sense to me.
I already openend a SO question with the same content:
https://stackoverflow.com/questions/54477472/last-and-operator-give-
different-results
There I was suggested to open a bug.
--
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Ticket URL: <https://code.djangoproject.com/ticket/30151#comment:1>
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