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class Serializer1(serializer.Modelserilizer):
class Meta:
model = Model1
field =['field1','field2']
class Serializer2(serializer.Modelserilizer):
serial1 = Serializer1(many=True,read_only=False,source='source_name']
class Meta:
model = Model2
field =['field1','field2','serial1']
# In "source_name" Enter the related_name of Model1. you have to set
related_name in ForeignKey field.