mirrors/django
1
0
Fork 0
mirror of https://github.com/django/django.git synced 2025-08-04 19:08:28 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 4

Fixed #28781 -- Added QuerySet.values()/values_list() support for union(), difference(), and intersection().

Browse source 
Thanks Tim Graham for the review.
This commit is contained in:
Mariusz Felisiak 2017-11-12 14:28:11 +01:00 • committed by GitHub
parent 8f8a4d10d3
commit 2d3cc94284
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
4 changed files with 49 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

13
docs/ref/models/querysets.txt
View file

@ -813,10 +813,17 @@ duplicate values, use the ``all=True`` argument.
of the type of the first ``QuerySet`` even if the arguments are ``QuerySet``\s
of other models. Passing different models works as long as the ``SELECT`` list
is the same in all ``QuerySet``\s (at least the types, the names don't matter
as long as the types in the same order).
as long as the types in the same order). In such cases, you must use the column
names from the first ``QuerySet`` in ``QuerySet`` methods applied to the
resulting ``QuerySet``. For example::
In addition, only ``LIMIT``, ``OFFSET``, ``COUNT(*)``, and ``ORDER BY`` (i.e.
slicing, :meth:`count`, and :meth:`order_by`) are allowed on the resulting
>>> qs1 = Author.objects.values_list('name')
>>> qs2 = Entry.objects.values_list('headline')
>>> qs1.union(qs2).order_by('name')
In addition, only ``LIMIT``, ``OFFSET``, ``COUNT(*)``, ``ORDER BY``, and
specifying columns (i.e. slicing, :meth:`count`, :meth:`order_by`, and
:meth:`values()`/:meth:`values_list()`) are allowed on the resulting
``QuerySet``. Further, databases place restrictions on what operations are
allowed in the combined queries. For example, most databases don't allow
``LIMIT`` or ``OFFSET`` in the combined queries.