Question

我有这些模特：

class Doctor(models.Model):
  coopsort = ManyToManyField('Cooperation', related_name='coopsort')
  name = models.CharField(...)

class Cooperation(models.Model):
  doctor = models.ManyToManyField(Doctor, blank=True, verbose_name=u"Doc")

如何使用coopsort m2m字段查询给定医生的所有合作？

Cooperation.objects.filter... <pls advise here>

Answer 1

您无需在两个模型中定义ManyToManyField。如果您需要Doctor型号：

class Doctor(models.Model):
    coopsort = ManyToManyField('Cooperation', related_name='coopsort')
    name = models.CharField(...)

class Cooperation(models.Model):
    cooperation_name = ...

然后您可以像这样过滤cooperations：

由医生id

cooperations = Cooperation.objects.filter(doctor__id=1)

医生姓名

cooperations = Cooperation.objects.filter(doctor__name='John')

Answer 2

doc # Doctor instance
queryset1 = doc.coopsort.all()
queryset2 = Cooperation.objects.filter(doctor=doc).all()
queryset = queryset1 | queryset2

related_name无法在m2m中运行

Answer 3

比我想象的要容易得多。这对我有用：

doc # Doctor instance 
SelectedCooperations = doc.coopsort.all()

具有多个m2m字段的Django查询集

3 个答案: