Django的查詢集與多個M2M領域

Question

我有這些模型：

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") 

我如何查詢使用coopsort M2M領域的醫生給出的所有項目合作？

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

Answer 1

比我預想的要容易得多。這工作對我來說：

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

Answer 2

在兩種模型中都不需要定義ManyToManyField。如果你需要在Doctor模式：

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

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

那麼你可以像這樣過濾cooperations：由醫生名字

由醫生ID

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

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

Answer 3

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

related_name無法在m2m中工作