How I can flatten many to many relationship using Django serializer - django

Question

I am new to Django. While I am try to implement serializer for many to many relationship I got problem.I want to serialize a many to many field and need to create a dictionary based on the nested object.
models.py
class ClassRoom(models.Model):
name = models.CharField(max_length=10)
def __str__(self):
return self.name
class Teacher(models.Model):
name = models.CharField(max_length=50)
def __str__(self):
return self.name
class Student(models.Model):
name = models.CharField(max_length=50)
class_room = models.ForeignKey(ClassRoom, on_delete=models.CASCADE)
teacher = models.ManyToManyField(Teacher)
def __str__(self):
return self.name
serializers.py
class ClassRoomSerializer(serializers.Serializer):
class Meta:
model = ClassRoom
fields = '__all__'
class TeacherSerializer(serializers.Serializer):
teacher_name = serializers.CharField(source="name", label="Teacher")
class Meta:
model = Teacher
fields = ['name']
class StudentSerializer(serializers.Serializer):
class_room = serializers.CharField(source="class_room.name")
teacher = TeacherSerializer(many=True)
student_name = serializers.CharField(source='name', label="Student")
class Meta:
model = Student
fields = ['student_name', 'teacher', 'class_room']
views.py
class HomeclassView(viewsets.ModelViewSet):
queryset = Student.objects.all()
serializer_class = StudentSerializer
I got the response like this:
{
results: [
{
"class_room": "Class 1",
"teacher": [
{
"teacher_name": "Maria"
},
{
"teacher_name": "sara"
}
],
"student_name": "John"
}
]
}
But I am expecting the result in :
{
results: [
{
"class_room": "Class 1",
"teacher_name": "Maria",
"student_name": "John"
},
{
"class_room": "Class 1",
"teacher_name": "sara",
"student_name": "John"
},
]
}
Please help me to achieve this.
Thanks in advance

Answer 1

you should for on teachers in ModelViewSet:
class HomeclassView(viewsets.ModelViewSet):
queryset = Student.objects.all()
serializer_class = StudentSerializer
def list(self, request, *args, **kwargs):
response = super().list(request, *args, **kwargs)
flat_response = []
for teacher in response['teacher']:
res = response.copy()
del res['teacher']
res['teacher_name'] = teacher['teacher_name']
flat_response.append(res)
return Response(data=flat_response)