django rest framework - How to POST nested object with parent object

Question

I have parent object order and nested object orderDetail.

class Order(Model):
     order_name = CharField(max_length=10)

class OrderDetails(Model):
     order_detail_name = CharField(max_length=10)
     order = ForeignKey('Order')

I want to get/insert/update/delete OrderDetails with order object itself. If I post this json, it should insert/update both objects.

{
    "id": 10,
    "order_name": "Some title",
    "orderDetails": [{
         "id": 15,
         "order_detail_name": "Best Detail"
     }]
}

Thats all. not able to find out any solution. I'm beginner to django/python.

TIA

anyone can plz help?

Parvinder Singh
– Parvinder Singh

2016-06-08 22:26:35 +00:00
Commented Jun 8, 2016 at 22:26 — Parvinder Singh
– Parvinder Singh, Commented Jun 8, 2016 at 22:26

Parvinder Singh · Accepted Answer · 2016-06-09 05:40:13Z

6

I solved get problem by my self using simpler two liner.

class OrderSerializer(serializers.ModelSerializer):
   orderdetail_set = OrderDetailSerializer(many=true)

POST

def create(self, validated_data):
    order_details_data = validated_data.pop('orderdetail_set')
    order = Order.objects.create(**validated_data)

    for order_detail_data in order_details_data:
        order_detail_data['order'] = order
        OrderDetail.objects.create(**order_detail_data)
    return order

Now its giving response as expected. :)

edited Jun 9, 2016 at 5:40

answered Jun 9, 2016 at 3:51

Parvinder Singh

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1 Comment

Seb Over a year ago

I can't POST several children in one request, I get the "Invalid data. Expected a dictionary, but got list." error message. As if although I have a many to one relationship like you between the parent and the child models, I can't pass a list in the parent object for the children. Have you done anything special to handle that, or have you encountered that error berfore?

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