python - 如何在 Django 查询集中解决这个特定查询

Question

+----+---------+-----------+---------------------+-----------+-----------+
| id | user_id | foo_id    | created_at          | active    |type       |
+----+---------+-----------+---------------------+-----------+-----------+
|  1 |       1 |         1 | 2011-05-10 13:12:35 |         1 | 2         |
|  7 |       5 |         2 | 2011-05-10 14:45:04 |         1 | 1         |
|  4 |       4 |         2 | 2011-05-10 13:24:45 |         1 | 2         |
|  8 |       6 |         2 | 2011-05-16 14:53:03 |         1 | 1         |
|  9 |       7 |         2 | 2011-05-16 14:55:11 |         1 | 0         |
+----+---------+-----------+---------------------+-----------+-----------+

这是django 中的一个UserMapper 模型。我想编写这样的查询:

获取foo_id = 2 and type=0的所有user_id和user_id = 6;的所有结果说;

select * from table where user_id = 6 and (foo_id=2 and type=6) // Such sort of query

我如何在 Django 查询集中做..

Answer 1

如果您的意思是 user_id=6 and type=6 and food_id=2，那么只需使用:

UserMapper.objects.filter(user_id=6, type=6, food_id=2)

如果你的意思是(user_id=6)或(type=6 and food_id=2)，你可以使用 Q 对象:

from django.db.models import Q
UserMapper.objects.filter(Q(user_id=6) | Q(type=6, food_id=2))

在此处查看有关 Q 对象的更多信息:http://docs.djangoproject.com/en/dev/topics/db/queries/#complex-lookups-with-q-objects