1
Use related_name
on the ForeignKeys
from django.db import models
class ModelA(models.Model):
name = models.CharField(max_length=50)
class ModelB(models.Model):
property = models.CharField(max_length=50)
class ModelC(models.Model):
a = models.ForeignKey(ModelA, related_name="theas")
b = models.ForeignKey(ModelB, related_name="thebs")
To get all ModelB instances that relate to an instance of ModelA
a_inst = ModelA.objects.get(foo=bar)
ModelB.objects.filter(thebs__a=a_inst)
Source:stackexchange.com