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Fixed #16895 -- Warned about cost of QuerySet ordering

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Thanks outofculture at gmail.com for the suggestion.
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e0ne 2013-09-08 22:57:36 +03:00 • committed by Tim Graham
parent 1185370c2c
commit cbf08c6b0c
3 changed files with 23 additions and 0 deletions
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6
docs/ref/models/options.txt
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@ -221,6 +221,12 @@ Django quotes column and table names behind the scenes.
ordering = ['-pub_date', 'author']
.. warning::
Ordering is not a free operation. Each field you add to the ordering
incurs a cost to your database. Each foreign key you add will
impliclty include all of its default orderings as well.
``permissions``
---------------

6
docs/ref/models/querysets.txt
View file

@ -334,6 +334,12 @@ You can tell if a query is ordered or not by checking the
:attr:`.QuerySet.ordered` attribute, which will be ``True`` if the
``QuerySet`` has been ordered in any way.
.. warning::
Ordering is not a free operation. Each field you add to the ordering
incurs a cost to your database. Each foreign key you add will
impliclty include all of its default orderings as well.
reverse
~~~~~~~