关于DRF中的中间模型与多对多关系的序列化，我遇到了一个大问题：如果请求方法得到了，那么一切都可以完美运行。但是只要我尝试POST或PUT Data到API，我就会收到以下错误：
内部服务器错误：/ api / ordering / Traceback（最近一次调用最后一次）：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（请求）文件“/home/neha/.local/lib/python3.5/site-packages/django/core/handlers/base.py”，第126行，在_get_response response = self.process_exception_by_middleware （e，request）文件“/home/neha/.local/lib/python3.5/site-packages/django/core/handlers/base.py”，第124行，在_get_response response = wrapped_callback（request，* callback_args， ** callback_kwargs）文件“/home/neha/.local/lib/python3.5/site-packages/django/views/decorators/csrf.py”，第54行，在wrapped_view中返回view_func（* args，** kwargs）文件“/home/neha/.local/lib/python3.5/site-packages/rest_framework/viewsets.py”，第116行，在视图中返回self.dispatch（request，* args，** kwargs）文件“/ home /neha/.local/lib/python3.5/site-packages/rest_framework/views.py“，第495行，在调度响应中= self.handle_exception（exc）文件”/ home / neha / .local / lib / python3.5 / site-packages / rest_framework / views.py“，第455行，在handle_exception中self.raise_uncaught_exception（exc）文件”/home/neha/.local/lib/python3.5 /site-packages/rest_framework/views.py“，第492行，在dispatch响应中= handler（request，* args，** kwargs）文件”/home/neha/.local/lib/python3.5/site-packages/ rest_framework / mixins.py“，第21行，在create self.perform_create（serializer）文件”/home/neha/.local/lib/python3.5/site-packages/rest_framework/mixins.py“，第26行，在perform_create中serializer.save（）文件“/home/neha/.local/lib/python3.5/site-packages/rest_framework/serializers.py”，第214行，保存self.instance = self.create（validated_data）文件“/ home / neha / .local / lib / python3.5 / site-packages / rest_framework / serializers.py“，第929行，创建raise_errors_on_nested_writes（'create'，self，validated_data）文件”/home/neha/.local/lib /python3.5/site-packages/rest_framework/serializers.py“，第823行，在raise_errors_on_nested_writes class_name = serializer.clas s.name
AssertionError：默认情况下，
.create()方法不支持可写嵌套字段。为序列化器.create()编写显式的ordering.serializers.CustOrderSerializer方法，或在嵌套的序列化器字段上设置read_only=True。
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对象的事实有关？
就像错误信息所说的那样，你必须在序列化器上编写自己的qazxsw poi方法，该方法负责在输入的.create()上创建对象。
通过这样做，您可以明确地告诉Django如何处理嵌套字段