Question

我有以下模型：

class Node(models.Model):
    name = models.CharField(max_length=128)
    user = models.Foreignkey(User)

    class Meta:
        db_table = 'node'

class Thing(models.Model):
    user = models.ForeignKey(User)
    begin_time = models.DateTimeField()
    node = models.ManyToManyField(Course)

    class Meta:
        db_table = 'thing'

class NodeLog(models.Model):
    actor = models.ForeignKey(User)
    node = models.ForeignKey(Node, related_name='nodelog_node')
    action_time = models.DateTimeField()
    result = models.CharField(max_length=128)

    class Meta:
        db_table = 'node_log'

以下数据如下：

table: node
+----+-------+---------+
| id | name  | user_id |
+----+-------+---------+
|  1 | node1 | 101     |
+----+-------+---------+
|  2 | node2 | 102     |
+----+-------+---------+

table: thing
+----+---------+---------------------+
| id | user_id | begin_time          |
+----+---------+---------------------+
|  1 | 1       | 2015-01-01 03:00:00 |
+----+---------+---------------------+

table: thing_node
+----+----------+---------+
| id | thing_id | node_id |
+----+----------+---------+
|  1 | 1        | 1       |
+----+---------+----------+
|  2 | 1        | 2       |
+----+---------+----------+

table: node_log
+----+----------+---------+------------------------------+
| id | actor_id | node_id | action_time        |  result |
+----+----------+---------+------------------------------+
|  1 | 101      | 1       |2015-01-01 01:00:00 |  agree  |
|  2 | 102      | 2       |2015-01-01 02:00:00 |  agree  |
|  3 | 101      | 1       |2015-01-01 04:00:00 |  agree  |
+----+----------+---------+--------------------+---------+

如果有人同意并且他的action_time大于begin_time，他再也不能同意，所以我确实排除了这样：

Thing.objects.filter(***).exclude(node__nodelog_node__action_time__gt=F('begin_time'), node__nodelog_node__actor=request.user)

request.user是102，结果是[]。

的结果

Thing.objects.filter(***)

是对的，有什么建议吗？谢谢！

Answer 1

我认为问题可能在于排除的行为不像过滤器。在排除中，条件不需要保持在一起（即不是和/或）

from the docs

filter（）对跨越多值的查询的行为如上所述，关系不是等效地实现的排除（）。相反，单个exclude（）调用中的条件不会必须指同一个项目。例如，以下查询将排除包含两个带有“列侬”的条目的博客 2008年发布的标题和条目：
Blog.objects.exclude(
    entry__headline__contains='Lennon',
    entry__pub_date__year=2008,
) However, unlike the behavior when using filter(), this will not limit blogs based on entries that satisfying both conditions. In order
这样做，即选择所有不包含条目的博客与2008年出版的“列侬”一起出版，你需要制作两个问题：
Blog.objects.exclude(
    entry=Entry.objects.filter(
        headline__contains='Lennon',
        pub_date__year=2008,
    ),
)

django queryset过滤表

1 个答案: