反向查找相关名称
Reverse look-up with related name
假设这些模型:
class Person (models.Model):
pass
和
class Marriage (models.Model):
person = models.ForeignKey(Person, on_delete = models.CASCADE, related_name='person')
person_2 = models.ForeignKey(Person, on_delete = models.CASCADE, related_name='person_2')
如何通过 Marriage 字段的 ID(例如 ID)过滤人员?也就是说,我的目标是做类似 Person.objects.filter(marriage__id=32) 的事情。我知道相关名称在那里有一些作用,但是例如 Person.objects.filter(person_2__marriage__id=32) 似乎也不起作用。
谢谢!
它会说您可以删除 related_name
并使用以下结构:
mariage = Mariage.objects.get(id=32)
person = mariage.person
person2 = mariage.person_2
但是,这取决于您要实现的目标。像这样:
class Marriage (models.Model):
person = models.ForeignKey(Person, on_delete = models.CASCADE, related_name='mariage_person_1')
person_2 = models.ForeignKey(Person, on_delete = models.CASCADE, related_name='mariage_person_2')
您应该能够 运行 查询,例如:
from django.db.models import Q
query = Q(mariage_person_1=32) | Q(mariage_person_2=32)
persons = Person.objects.filter(query)
假设这些模型:
class Person (models.Model):
pass
和
class Marriage (models.Model):
person = models.ForeignKey(Person, on_delete = models.CASCADE, related_name='person')
person_2 = models.ForeignKey(Person, on_delete = models.CASCADE, related_name='person_2')
如何通过 Marriage 字段的 ID(例如 ID)过滤人员?也就是说,我的目标是做类似 Person.objects.filter(marriage__id=32) 的事情。我知道相关名称在那里有一些作用,但是例如 Person.objects.filter(person_2__marriage__id=32) 似乎也不起作用。
谢谢!
它会说您可以删除 related_name
并使用以下结构:
mariage = Mariage.objects.get(id=32)
person = mariage.person
person2 = mariage.person_2
但是,这取决于您要实现的目标。像这样:
class Marriage (models.Model):
person = models.ForeignKey(Person, on_delete = models.CASCADE, related_name='mariage_person_1')
person_2 = models.ForeignKey(Person, on_delete = models.CASCADE, related_name='mariage_person_2')
您应该能够 运行 查询,例如:
from django.db.models import Q
query = Q(mariage_person_1=32) | Q(mariage_person_2=32)
persons = Person.objects.filter(query)