Getting the whole object of a related field in django - django

Question

I have a model like this:
class Cart(models.Model):
id = models.UUIDField(primary_key=True, default=uuid4)
customer = models.ForeignKey(Customer, on_delete=models.CASCADE, null=True)
class Reception(models.Model):
PAYMENT_STATUS_PENDING = 'P'
PAYMENT_STATUS_COMPLETE = 'C'
PAYMENT_STATUS_FAILED = 'F'
PAYMENT_STATUS_CHOICES = [
(PAYMENT_STATUS_PENDING, 'Pending'),
(PAYMENT_STATUS_COMPLETE, 'Complete'),
(PAYMENT_STATUS_FAILED, 'Failed')
]
cart = models.ForeignKey(Cart, on_delete=models.CASCADE, null=True)
customer = models.ForeignKey(Customer, on_delete=models.CASCADE)
entry_date = models.DateField()
total_price = models.IntegerField()
payment_status = models.CharField(
max_length=1,
choices=PAYMENT_STATUS_CHOICES,
default=PAYMENT_STATUS_PENDING
)
My question is:
How can I get a particular Cart record from the Reception model?
I tried using this serializer:
class ReceptionSerializer(serializers.ModelSerializer):
class Meta:
model = Reception
fields = ['id', 'customer', 'entry_date', 'payment_status', 'cart']
but it only returns the id of a cart. I want to return the whole object of that specific cart.
How can I do that?

Answer 1

If you want to utilize nested serialization, one possible solution would be to define CartSerializer and override the cart field of the ReceptionSerializer class as follows
class CartSerializer(serializers.ModelSerializer):
class Meta:
model = Cart
fields = ['id', 'customer']
class ReceptionSerializer(serializers.ModelSerializer):
cart = CartSerializer(many=True)
class Meta:
model = Reception
fields = ['id', 'customer', 'entry_date', 'payment_status', 'cart']
However, please note that the cart field will become read-only this way.