django-qmanager
is a reusable Django application which allows you to create managers for Django models, based on pre-defined queries. It leverages Django's Q
object (django.db.models.Q
) to allow for rich expressions, without having to go through the rigmarole of sub-classing django.db.models.Manager
and overriding get_query_set()
. Easy things should be easy.
The usual:
easy_install django-qmanager # OR
pip install django-qmanager
The only other thing you'll need is Django itself.
Basic usage is as follows:
from django.db import models
from djqmgr import QManager
class Person(models.Model):
GENDERS = (
('m', 'Male'),
('f', 'Female'),
('u', 'Unspecified'),
)
age = models.PositiveIntegerField()
gender = models.CharField(max_length=1, choices=GENDERS)
objects = models.Manager()
minors = QManager(age__lt=18)
adults = ~minors
men = QManager(gender='m')
women = QManager(gender='f')
specified = men | women
unspecified = ~(men | women)
Note that you can invert and combine QManager
instances as you can Q
objects, and the binary or and and operators (via |
and &
) can accept other QManager
objects, Q
objects, and dictionaries.
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means.
In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit of the public at large and to the detriment of our heirs and successors. We intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this software under copyright law.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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