关于DRF中与中间模型的多对多关系的序列化，我有一个大问题：如果请求方法是get一切正常。但是一旦我尝试将数据发布或放入 API，我就会收到以下错误：
内部服务器错误：/api/ordering/回溯(最近的调用) 最后)：文件 "/home/neha/.local/lib/python3.5/site-packages/django/core/handlers/exception.py"， 第 34 行，在内部 响应 = get_response(request) 文件 "/home/neha/.local/lib/python3.5/site-packages/django/core/handlers/base.py"， 126号线，_get_response response = self.process_exception_by_middleware(e， request) File "/home/neha/.local/lib/python3.5/site-packages/django/core/handlers/base.py"， 124号线，_get_response response = wrapped_callback(request， *callback_args， **callback_kwargs) File "/home/neha/.local/lib/python3.5/site-packages/django/views/decorators/csrf.py"， 第 54 行，在wrapped_view return view_func(*args， **kwargs) File "/home/neha/.local/lib/python3.5/site-packages/rest_framework/viewsets.py"， 116路，视野 return self.dispatch(request， *args， **kwargs) File "/home/neha/.local/lib/python3.5/site-packages/rest_framework/views.py"， 495 行，调度中 响应 = self.handle_exception(exc) 文件 "/home/neha/.local/lib/python3.5/site-packages/rest_framework/views.py"， 455路，handle_exception self.raise_uncaught_exception(exc) 文件 "/home/neha/.local/lib/python3.5/site-packages/rest_framework/views.py"， 492行，调度中 response = handler(request， *args， **kwargs) File "/home/neha/.local/lib/python3.5/site-packages/rest_framework/mixins.py"， 第 21 行，在创建中 self.perform_create(serializer) File "/home/neha/.local/lib/python3.5/site-packages/rest_framework/mixins.py"， 26号线，perform_create serializer.save() File "/home/neha/.local/lib/python3.5/site-packages/rest_framework/serializers.py"， 第 214 行，保存中 self.instance = self.create(validated_data) File "/home/neha/.local/lib/python3.5/site-packages/rest_framework/serializers.py"， 第 929 行，在创建中 raise_errors_on_nested_writes("创建"、自我、validated_data) 文件 "/home/neha/.local/lib/python3.5/site-packages/rest_framework/serializers.py"， 823号线，raise_errors_on_nested_writes class_name=序列化程序。类。名字
断言错误：
.create()方法不支持可写 默认情况下为嵌套字段。编写显式.create()方法 序列化程序ordering.serializers.CustOrderSerializer或设置read_only=True嵌套序列化程序字段。
views.py
from ordering.models import CustOrder, Product, Price, City, Area
from rest_framework import viewsets, permissions
from .serializers import CustOrderSerializer, ProductSerializer,
PriceSerializer, CitySerializer, AreaSerializer
class CustOrderViewSet(viewsets.ModelViewSet):
queryset = CustOrder.objects.all()
permission_classes = [
permissions.AllowAny
]
serializer_class = CustOrderSerializer
class ProductViewSet(viewsets.ModelViewSet):
queryset = Product.objects.all()
permission_classes = [
permissions.AllowAny
]
serializer_class = ProductSerializer
class PriceViewSet(viewsets.ModelViewSet):
queryset = Price.objects.all()
permission_classes = [
permissions.AllowAny
]
serializer_class = PriceSerializer
class CityViewSet(viewsets.ModelViewSet):
queryset = City.objects.all()
permissions_classes = [
permissions.AllowAny
]
serializer_class = CitySerializer
class AreaViewSet(viewsets.ModelViewSet):
queryset = Area.objects.all()
permisions_classes = [
permissions.AllowAny
]
serializer_class = AreaSerializer
enter code here
serializer.py
from rest_framework import serializers
from ordering.models import CustOrder, Area, City, Product, Price
class ProductSerializer(serializers.ModelSerializer):
class Meta:
model = Product
fields = '__all__'
class PriceSerializer(serializers.ModelSerializer):
class Meta:
model = Price
fields = '__all__'
queryset=Product.objects.all())
# class AreaSerializer(serializers.ModelSerializer):
# class Meta:
# model = Area
# fields = '__all__'
class CitySerializer(serializers.ModelSerializer):
class Meta:
model = City
fields = '__all__'
class AreaSerializer(serializers.ModelSerializer):
class Meta:
model = Area
fields = '__all__'
class CustOrderSerializer(serializers.ModelSerializer):
price = serializers.SlugRelatedField(slug_field='price', queryset=Price.objects.all())
# product = serializers.SlugRelatedField(slug_field='product', queryset=Product.objects.all())
area = serializers.SlugRelatedField(slug_field='address', queryset=Area.objects.all())
city = serializers.SlugRelatedField(slug_field='city', queryset=City.objects.all())
product = ProductSerializer(many=True)
class Meta:
model = CustOrder
fields = '__all__'
def create(self, validated_data):
products = validated_data.pop('product')
product = Product.objects.create(**validated_data)
for products in products:
Product.objects.create(product=product, **products)
return product
# product = serializers.CharField(source="Product.product", read_only=True)
# price = serializers.CharField(source="Price.price", read_only=True)
# city = serializers.CharField(source="City.city", read_only=True)
# area = serializers.CharField(source="Area.area", read_only=True)
# price = serializers.SlugRelatedField(slug_field='price', queryset=Price.objects.all())
# product = serializers.SlugRelatedField(slug_field='product', queryset=Product.objects.all())
# area = serializers.SlugRelatedField(slug_field='address', queryset=Area.objects.all())
# city = serializers.SlugRelatedField(slug_field='city', queryset=City.objects.all())
# def to_representation(self, instance):
# response = super().to_representation(instance)
# response['child'] = ProductSerializer(instance.product).data
# return response
enter code here
model.py
from django.db import models
from phonenumber_field.modelfields import PhoneNumberField
from django.contrib.postgres.fields import ArrayField
from phone_field import PhoneField
from django.contrib.gis.db import models
from decimal import Decimal
from django.db.models import Sum
class City(models.Model):
city = models.CharField(max_length=200)
def __str__(self):
return self.city
class Meta:
verbose_name_plural = "Cities"
class Area(models.Model):
city = models.ForeignKey('City', on_delete=models.CASCADE)
address = models.CharField(max_length=200)
def __str__(self):
return self.address
class Product(models.Model):
product_id = models.AutoField(primary_key=True)
product = ArrayField(models.CharField(max_length=200, blank=True))
# price = models.DecimalField(max_digits=50, decimal_places = 5, default=0)
# def __str__(self):
# return str(self.product)+ ":$" + str(self.price)
# @property
# def price(self):
# return "$%s" % self.price
def __str__(self):
return str(self.product)
# def __str__(self):
# return "%s" % self.product_id
# def natural_key(self):
# return self.product
# class Meta:
# verbose_name_plural = "Products"
class Price(models.Model):
# product = models.ManyToManyField(Product, through='CustOrder', through_fields=('price', 'product'),)
# price_id = models.AutoField(primary_key=True)
price = models.DecimalField(max_digits=50, decimal_places = 5, default=0)
def __str__(self):
return "%s" % self.price
# return str(self.product)+ ":$" + str(self.price)
PRODUCT_CHOICES=(
('product_test_with_new_format','PRODUCT_TEST_WITH_NEW_FORMAT'),
('pulled chicken in pineapple relish','PULLED CHICKEN IN PINEAPPLE RELISH'),
('sundried sardines in mango relish', 'PULLED CHICKEN IN MANGO RELISH'),
('sundried sardines in mango relish','SUNDRIED SARDINES IN MANGO RELISH'),
)
GENDER_CHOICES = (
('male', 'MALE'),
('female', 'FEMALE'),
)
PAYMENT_CHOICES = (
('cod','COD'),
('card on delivery','CARD ON DELIVERY'),
('razor pay (netbanking)','RAZOR PAY (NET BANKING)'),
('razor pay (card)','RAZOR PAY (CARD)'),
('razor pay (wallet)','RAZOR PAY (WALLET)'),
('citrus','CITRUS'),
('paytm','PAYTM'),
)
CITY_CHOICES = (
('bangalore', 'BANGALORE'),
('hyderabad', 'HYDERABAD'),
('gurugram','GURUGRAM'),
('pune','PUNE'),
('chandigarh','CHANDIGARH'),
('mumbai','MUMBAI'),
)
# class ProductItem(models.Model):
# # product = models.ManyToManyField(Price, through='CustOrder')
# productitem = models.ManyToManyField(Product, through='CustOrder', through_fields=('productitem', 'product'),)
# def __str__(self):
# return str(self.productitem)
class CustOrder(models.Model):
Customer_id = models.AutoField(primary_key=True)
CustomerName = models.CharField(max_length=200)
email = models.EmailField(max_length=70,blank=True, null= True, unique= True)
gender = models.CharField(max_length=6, choices=GENDER_CHOICES)
phone = PhoneField(null=False, blank=True, unique=True)
landmark = models.PointField()
#landmark = models.TextField(max_length=400, help_text="Enter the landmark", default='Enter landmark')
houseno = models.IntegerField(default=0)
#product_name = models.CharField(max_length=200, choices=PRODUCT_CHOICES,default='Boneless chicken')
# product_id = models.ForeignKey(Product, on_delete=models.CASCADE,related_name='custorder_productid')
product = models.ManyToManyField(Product, blank=True,related_name='pricetag')
quantity = models.IntegerField(default=0)
# price_id = models.ForeignKey(Price)
price = models.ForeignKey(Price, on_delete=models.SET_NULL, null=True,related_name='pricetag')
#price = models.DecimalField(max_digits=50, decimal_places=5, default=48.9)
pay_method = models.CharField(max_length=200,choices=PAYMENT_CHOICES, default='RAZOR PAY')
city = models.ForeignKey(City, on_delete=models.SET_NULL, null=True)
area = models.ForeignKey(Area, on_delete=models.SET_NULL, null=True)
Price.objects.aggregate(Sum('price'))
def __str__(self):
return self.CustomerName
我认为您的错误与您返回Product对象而不是CustOrder对象有关？
就像错误消息所说的那样，您必须在序列化程序上编写 owm.create()方法，该方法负责从传入的validated_data创建对象。
通过这样做，你可以明确地告诉Django如何处理嵌套字段
。