nested objects in Django rest framework - django

Question

I want to design solution for ordering items. I have endpoint that create orders BUT I need to to have items object in the order. let me show you the code
class ItemModel(models.Model):
name = models.CharField(max_length=50)
price = models.FloatField()
discretion = models.CharField(max_length=500)
available = models.BooleanField(default=True)
class OrderModel(models.Model):
phone = models.CharField(max_length=20)
delevary_time = models.DateTimeField()
class CartModel(models.Model):
order = models.ForeignKey(OrderModel, on_delete=models.CASCADE, related_name='order_m')
item = models.ForeignKey(ItemModel, on_delete=models.CASCADE, related_name='item_m')
I need endpoint that create order to me. her what I did
class CartSerializer(serializers.ModelSerializer):
class Meta:
model = CartModel
exclude = ['order',]
depth = 2
class OrderSerializer(serializers.ModelSerializer):
cart = serializers.SerializerMethodField()
class Meta:
model = OrderModel
fields = ['phone', 'state', 'delevary_time', 'cart']
def get_cart(self, obj):
cart = CartModel.objects.filter(order__id=obj.id)
serializer = CartSerializer(cart, many=True)
return serializer.data
this is the endpoint
router.register('order', OrderViewSet, 'api-order')
{
"phone": 124997988698,
"delevary_time": "2020-07-17T19:34:00",
"cart": [
{
"item": 1
},
{
"item": 2
}
]
}
when I post the json it don't save the cart it only save the oder phone and delevary_time. How I can save the cart at the same time

Answer 1

class CartSerializer(serializers.ModelSerializer):
class Meta:
model = CartModel
exclude = ['order',]
depth = 2
class OrderSerializer(serializers.ModelSerializer):
order_m = CartSerializer(many=True) # adding this
class Meta:
model = OrderModel
fields = ['phone', 'state', 'delevary_time', 'order_m']
def create(self, validated_data):
cart_data = validated_data.pop('order_m')
order = OrderModel.objects.create(**validated_data)
for c in cart_data:
CartModel.objects.create(order=order, **c)
return order