innov
/
django1
1
0
Fork 0
Code Issues Pull Requests 1 Projects Releases Wiki Activity

[1.8.x] Fixed #25893 -- Corrected custom lookups example. 

Backport of ffcdb0b471 from master
This commit is contained in:
Bruno Alla 2015-12-08 18:31:55 +00:00 committed by Tim Graham
parent f179d35f54
commit c0c2c7ecd6
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
docs/howto/custom-lookups.txt
View File

@ -202,10 +202,10 @@ The implementation is::
There are a couple of notable things going on. First, ``AbsoluteValueLessThan``
isn't calling ``process_lhs()``. Instead it skips the transformation of the
``lhs`` done by ``AbsoluteValue`` and uses the original ``lhs``. That is, we
want to get ``27`` not ``ABS(27)``. Referring directly to ``self.lhs.lhs`` is
safe as ``AbsoluteValueLessThan`` can be accessed only from the
``AbsoluteValue`` lookup, that is the ``lhs`` is always an instance of
``AbsoluteValue``.
want to get ``"experiments"."change"`` not ``ABS("experiments"."change")``.
Referring directly to ``self.lhs.lhs`` is safe as ``AbsoluteValueLessThan``
can be accessed only from the ``AbsoluteValue`` lookup, that is the ``lhs``
is always an instance of ``AbsoluteValue``.
Notice also that as both sides are used multiple times in the query the params
need to contain ``lhs_params`` and ``rhs_params`` multiple times.