I want to build a nested serializer to display order with product and each product showing its individual value. I have my code below - django

Question

I am trying to get a nested serializer with individual value displayed with particular product but i am getting all the values in a single product.
i dont kow what to do there is some mistake in my code i cant figure out where.
please help me out.
this is my code
models.py
class Order(models.Model):
user = models.ForeignKey(Account, related_name='orders',
on_delete=models.CASCADE)
first_name = models.CharField(max_length=100)
last_name = models.CharField(max_length=100)
email = models.CharField(max_length=100)
address = models.CharField(max_length=100)
zipcode = models.CharField(max_length=100)
place = models.CharField(max_length=100)
phone = models.CharField(max_length=100)
created_at = models.DateTimeField(auto_now_add=True)
paid_amount = models.DecimalField(max_digits=8, decimal_places=2, blank=True, null=True)
class Meta:
ordering = ['-created_at',]
def __str__(self):
return self.first_name
def get_total_price(self):
total = sum(item.get_cost() for item in self.items.all())
class OrderItem(models.Model):
order = models.ForeignKey(Order, related_name='items', on_delete=models.CASCADE, null=True,
blank=True)
glasses = models.ForeignKey(Glasses, related_name='glass', on_delete=models.CASCADE)
price = models.DecimalField(max_digits=8, decimal_places=2)
quantity = models.IntegerField(default=1)
ordered = models.BooleanField(default=False)
def get_cost(self):
return self.price * self.quantity
class Power(models.Model):
frame = models.ForeignKey(OrderItem, related_name='power', on_delete=models.CASCADE)
type = models.CharField(max_length=20, choices=[('Powered', 'Powered'), ('bifocal', 'bifocal'),
('Frame_only', 'Frame_only')])
left_eye_power = models.DecimalField(max_digits=3, decimal_places=2, null=True, blank=True)
left_eye_cylinder = models.DecimalField(max_digits=3, decimal_places=2, null=True, blank=True)
left_eye_bifocal = models.DecimalField(max_digits=3, decimal_places=2, null=True, blank=True)
left_eye_axis = models.DecimalField(max_digits=3, decimal_places=2, null=True, blank=True)
right_eye_power = models.DecimalField(max_digits=3, decimal_places=2, null=True, blank=True)
right_eye_cylinder = models.DecimalField(max_digits=3, decimal_places=2, null=True, blank=True)
right_eye_bifocal = models.DecimalField(max_digits=3, decimal_places=2, null=True, blank=True)
right_eye_axis = models.DecimalField(max_digits=3, decimal_places=2, null=True, blank=True)
serializer.py
class PowerSerializer(serializers.ModelSerializer):
class Meta:
model = Power
fields = '__all__'
class OrderItemSerializer(serializers.ModelSerializer):
#power = serializers.RelatedField(read_only=True)
power = PowerSerializer(many=True)
class Meta:
model = OrderItem
fields = (
"price",
"glasses",
"power",
"quantity",
)
class OrderSerializer(serializers.ModelSerializer):
items = OrderItemSerializer(many=True)
class Meta:
model = Order
fields = (
"id",
"first_name",
"last_name",
"email",
"address",
"zipcode",
"place",
"phone",
"items",
)
views.py
class OrderListView(ListCreateAPIView):
queryset = Order.objects.all()
serializer_class = OrderSerializer
authentication_classes = (authentication.TokenAuthentication,)
permission_classes = (permissions.AllowAny,)
output i got:
{
"count": 1,
"next": null,
"previous": null,
"results": [
{
"id": 1,
"first_name": "priyank",
"last_name": "nair",
"email": "priyankshashinair#gmail.com",
"address": "1/A 401",
"zipcode": "400102",
"place": "Mumbai",
"phone": "9833437879",
"items": [
{
"price": "234.00",
"glasses": 1,
"power": [
{
"id": 1,
"type": "Powered",
"left_eye_power": "0.16",
"left_eye_cylinder": "0.14",
"left_eye_bifocal": "0.16",
"left_eye_axis": "0.13",
"right_eye_power": "0.14",
"right_eye_cylinder": "0.15",
"right_eye_bifocal": "0.14",
"right_eye_axis": "0.19",
"frame": 1
},
{
"id": 2,
"type": "Frame_only",
"left_eye_power": null,
"left_eye_cylinder": null,
"left_eye_bifocal": null,
"left_eye_axis": null,
"right_eye_power": null,
"right_eye_cylinder": null,
"right_eye_bifocal": null,
"right_eye_axis": null,
"frame": 1
}
],
"quantity": 1
},
{
"price": "234.00",
"glasses": 2,
"power": [],
"quantity": 2
}
]
}
]
}
Output i want:
{
"count": 1,
"next": null,
"previous": null,
"results": [
{
"id": 1,
"first_name": "priyank",
"last_name": "nair",
"email": "priyankshashinair#gmail.com",
"address": "1/A 401",
"zipcode": "400102",
"place": "Mumbai",
"phone": "9833437879",
"items": [
{
"price": "234.00",
"glasses": 1,
"power": [
{
"id": 1,
"type": "Powered",
"left_eye_power": "0.16",
"left_eye_cylinder": "0.14",
"left_eye_bifocal": "0.16",
"left_eye_axis": "0.13",
"right_eye_power": "0.14",
"right_eye_cylinder": "0.15",
"right_eye_bifocal": "0.14",
"right_eye_axis": "0.19",
"frame": 1
}
],
"quantity": 1
},
{
"price": "234.00",
"glasses": 2,
"power": [
{
"id": 2,
"type": "Frame_only",
"left_eye_power": null,
"left_eye_cylinder": null,
"left_eye_bifocal": null,
"left_eye_axis": null,
"right_eye_power": null,
"right_eye_cylinder": null,
"right_eye_bifocal": null,
"right_eye_axis": null,
"frame": 1
},
],
"quantity": 2
}
]
}
]
}

Answer 1

Everything is correct, the problem is in your data - both Power objects clearly show "frame": 1, and your desired output is not possible without the second power having "frame": 2.