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[1.8.x] Refs #24462 -- Emphasized that order_by() clears previous ordering.
Backport of b9d9ab23bdcc404708aada664e718a9d56415ca3 from master
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@ -393,6 +393,11 @@ You can tell if a query is ordered or not by checking the
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:attr:`.QuerySet.ordered` attribute, which will be ``True`` if the
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``QuerySet`` has been ordered in any way.
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Each ``order_by()`` call will clear any previous ordering. For example, this
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query will be ordered by ``pub_date`` and not ``headline``::
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Entry.objects.order_by('headline').order_by('pub_date')
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.. warning::
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Ordering is not a free operation. Each field you add to the ordering
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