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Code Issues 32 Releases Wiki Activity

Fixed #17027 -- Added support for the power operator in F expressions.

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Thanks dan at dlo.me for the initial patch.

- Added __pow__ and __rpow__ to ExpressionNode
- Added oracle and mysql specific power expressions
- Added used-defined power function for sqlite
This commit is contained in:
Florian Hahn
2013-02-21 23:02:18 +01:00
committed by Tim Graham
parent 1597503a01
commit 5240b83462
9 changed files with 56 additions and 2 deletions
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6
docs/topics/db/queries.txt
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@@ -610,12 +610,16 @@ and use that ``F()`` object in the query::
>>> Entry.objects.filter(n_comments__gt=F('n_pingbacks'))
Django supports the use of addition, subtraction, multiplication,
division and modulo arithmetic with ``F()`` objects, both with constants
division, modulo, and power arithmetic with ``F()`` objects, both with constants
and with other ``F()`` objects. To find all the blog entries with more than
*twice* as many comments as pingbacks, we modify the query::
>>> Entry.objects.filter(n_comments__gt=F('n_pingbacks') * 2)
.. versionadded:: 1.7
The power operator ``**`` was added.
To find all the entries where the rating of the entry is less than the
sum of the pingback count and comment count, we would issue the
query::