我有一个 json 数据要保存到 django 模型。当我尝试保存它时，我遇到了各种各样的错误，我试图解决它，但都无济于事。请帮助我，我是 django rest 框架的新手。 这是我要插入的模型：
class OrderItemDishItem(SoftDeleteModelBase):
item = models.ForeignKey(DishItem, on_delete=models.CASCADE)
quantity = models.PositiveIntegerField(default=1)
price = models.DecimalField(max_digits=5, decimal_places=2,default=0.00)
class OrderItem(SoftDeleteModelBase):
dish = models.ForeignKey(Dish, on_delete=models.CASCADE)
items = models.ManyToManyField(OrderItemDishItem, related_name="dish_items")
quantity = models.PositiveIntegerField(default=1)
unit_price = models.DecimalField(max_digits=5, decimal_places=2,default=0.00)
discount_amount = models.DecimalField(max_digits=5, decimal_places=2,default=0.00)
discount_percent = models.DecimalField(max_digits=5, decimal_places=2,default=0.00)
class Order(SoftDeleteModelBase):
foodjoint=models.ForeignKey(FoodJoint, on_delete=models.CASCADE, related_name="orders", null=True)
customer=models.ForeignKey(CustomerProfile,on_delete=models.CASCADE,null=True)
items = models.ManyToManyField(to=OrderItem, related_name="order")
total_cost = models.DecimalField(max_digits=5, decimal_places=2,default=0.00)
discount_amount = models.DecimalField(max_digits=5, decimal_places=2,default=0.00)
discount_percent = models.DecimalField(max_digits=5, decimal_places=2,default=0.00)
这是我为他们每个人提供的序列化程序类：
class OrderItemDishItemSerializer(serializers.ModelSerializer):
def __init__(self, *args, **kwargs):
many = kwargs.pop('many', True)
super(OrderItemDishItemSerializer, self).__init__(many=many, *args, **kwargs)
class Meta:
model = models.OrderItemDishItem
fields = '__all__'
depth = 1
def create(self, validated_data):
dish_item = validated_data.pop("items")
item_obj = models.OrderItemDishItem.objects.create(**item)
validated_data["items"]=item_obj
return super().create(validated_data)
class OrderItemSerializer(serializers.ModelSerializer):
items = OrderItemDishItemSerializer(many=True)
def __init__(self, *args, **kwargs):
many = kwargs.pop('many', True)
super(OrderItemSerializer, self).__init__(many=many, *args, **kwargs)
class Meta:
model = models.OrderItem
fields = '__all__'
def create(self, validated_data):
items = validated_data.pop("items")
for order in items:
item = OrderItemDishItemSerializer(data=order["items"])
models.OrderItem.objects.create(
item_id= item.initial_data,
quantity= order["quantity"],
unit_price=order['unit_price']
)
validated_data["items"]=item.initial_data
return super().create(validated_data)
class OrderSerializer(serializers.ModelSerializer):
customer = CustomerSerializer()
items = OrderItemSerializer(many=True)
class Meta:
model = models.Order
fields = '__all__'
depth = 1
def create(self, validated_data):
user_account= validated_data["customer"].pop("user_account")
# user_account['password'] = make_password(user_account['password'])
user = User.objects.create_user(**user_account)
customer = validated_data.pop("customer")
customer = models.CustomerProfile.objects.create(
mobile_number= customer["mobile_number"],
address= customer["address"],
user_account= user
)
# add OrderItems
order_items = validated_data.pop("items")
items = OrderItemSerializer(data=order_items)
validated_data["items"] = items.initial_data
validated_data["customer"] = customer
# validated_data["customer"]["user_account"] = user
return super().create(validated_data)
这是我发布的 json 数据：
{
"foodjoint_id": 1,
"customer": {
"mobile_number": 2013717123,
"address": "Sunyani",
"picture": null,
"user_account": {
"username": 2013717123,
"first_name": "Rahman",
"last_name": "Lawal",
"email": "[email protected]",
"password": "test1234"
}
},
"items": [
{
"items": [
{
"quantity": 1,
"price": 22,
"item": 2
},
{
"quantity": 1,
"price": 10,
"item": 4
},
{
"quantity": 1,
"price": 2,
"item": 6
},
{
"quantity": 1,
"price": 0,
"item": 12
},
{
"quantity": 1,
"price": 0,
"item": 13
},
{
"quantity": 1,
"price": 5,
"item": 9
}
],
"unit_price": 22,
"quantity": 1,
"dish": 2
}
],
"total_cost": 0,
"discount_amount": 0,
"discount_percent": 0
}
请问我如何保存数据？
我得到的错误：
When a serializer is passed a `data` keyword argument you must call `.is_valid()` before attempting to access the serialized `.data` representation.
You should either call `.is_valid()` first, or access `.initial_data` instead.
在键入序列化数据之前，尝试调用对您传入的数据有效。
items = OrderItemSerializer(data=order_items)
if items.is_valid():
validated_data["items"] = items.initial_data
validated_data["customer"] = customer
我后来在 rest-framework 文档的帮助下找到了如何做http://www.django-rest-framework.org/api-guide/relations/#nested-relationships
class OrderSerializer(serializers.ModelSerializer):
customer = CustomerSerializer()
items = OrderItemSerializer(many=True)
class Meta:
model = models.Order
fields = ('id','foodjoint_id','items','customer','total_cost','discount_amount','discount_percent')
depth = 1
def create(self, validated_data):
# get our user info
customer= validated_data.pop("customer")
# get order_items
order_items = validated_data.pop("items")
# get user info from customer
user_account = customer.pop("user_account")
# create user [1]
user = User.objects.create_user(**user_account)
# create customer [2]
customer['user_account']=user
customer_instance = models.CustomerProfile.objects.create(**customer)
order_items_created=[]
for item in order_items:
# get order items dish items
order_items_dish_items = item.pop("items")
order_item_instance = models.OrderItem.objects.create(**item)
for order_item_data in order_items_dish_items:
# create orderitemdishitem [3]
# dish_item_instance = models.DishItem.objects.filter(id=order_item_data['dish_item_item']).first()
order_item_instance.items.add(models.OrderItemDishItem.objects.create(**order_item_data))
# create order item [4]
order_items_created.append(order_item_instance)
# create order [5]
order_instance = models.Order.objects.create(customer=customer_instance,**validated_data)
order_instance.items.set(order_items_created)
return order_instance