多对多和通过 table 的 Django 查询

Question

假设我有这些 Django ORM classes:

class Event(models.Model):
    creator = models.ForeignKey(User, related_name="created_events")
    participants = models.ManyToManyField(
        User, related_name="joined_events", through='EventsParticipants')


class EventsParticipants(models.Model):
    user = models.ForeignKey(User)
    event = models.ForeignKey(Event)
    date_invited = models.DateTimeField(
        auto_now_add=True, blank=False, null=False)

    class Meta:
        unique_together = (('user', 'event'),)

class User(models.Model):
    name = models.CharField(....)

我的问题是： 我想在单个查询集中获取我创建的所有事件 + 我使用事件 class 参与的所有事件。

Answer 1

像这样：

from django.db.models import Q

Event.objects.filter(Q(creator=me) | Q(participants=me)).distinct()

参见：
https://docs.djangoproject.com/en/1.9/topics/db/queries/#complex-lookups-with-q-objects
https://docs.djangoproject.com/es/1.9/ref/models/querysets/#django.db.models.query.QuerySet.distinct

多对多和通过 table 的 Django 查询

Django query with many to many and through table

python

django

django-models

django-orm