Django Rest - Posted数据在外键引用的表中创建新行

Question

我正在尝试将数据发布到我的订单模型中。它有几个外键。当我尝试发布数据时，它也在尝试在引用的模型中创建对象。我的models.py：

from django.db import models
from django.contrib.auth.models import User
from accounts.models import Profile

class Nursery(models.Model):
    name = models.CharField(max_length=30,unique=True)
    state = models.CharField(max_length=40)
    city = models.CharField(max_length=40)
    profile = models.OneToOneField(Profile,on_delete=models.CASCADE)


class Plants(models.Model):
    name = models.CharField(max_length=30,unique=True)
    image = models.ImageField(upload_to='static/plants')
    price = models.IntegerField()
    nursery = models.ForeignKey(Nursery,on_delete=models.CASCADE)

class Order(models.Model):
    user = models.ForeignKey(User,on_delete=models.CASCADE)
    product = models.ForeignKey(Plants,on_delete=models.CASCADE)
    date_ordered = models.DateTimeField(auto_now=True)
    order_id = models.UUIDField(auto_created=True)
    is_purchased = models.BooleanField(default=False)
    cost = models.IntegerField()
    quantity = models.IntegerField()
    nursery = models.ForeignKey(Nursery,on_delete=models.CASCADE)

因此，我尝试将数据发布到订单模型中，它给出了错误Plant name already exists，这意味着它还试图在植物和苗木模型中创建一行。我的serializers.py：

from .models import Plants,Order,Nursery
from rest_framework import serializers

class NurserySerializer(serializers.ModelSerializer):
    class Meta:
        model = Nursery
        fields = "__all__"

class PlantSerializer(serializers.ModelSerializer):
    nursery = NurserySerializer()
    # nursery = NurserySerializer()
    class Meta:
        model = Plants
        fields = ['name', 'price','image','nursery']


class OrderSerializer(serializers.ModelSerializer):
    user_name = serializers.CharField(source='user.username', read_only=True)
    product = PlantSerializer()
    nursery = serializers.CharField(source='nursery.name', read_only=True)

    class Meta:
        model = Order
        fields = ['user_name', 'product','date_ordered','order_id','is_purchased','cost','quantity','nursery']

Views.py：

class PostOrder(APIView):
    def post(self, request, format=None):
       print(request.data)
       serializer = OrderSerializer(data=request.data)
       if serializer.is_valid():
           serializer.save()
           return Response(serializer.data, status=status.HTTP_201_CREATED)
       return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

Answer 1

你能做到的，

对不起，我不明白您想在哪里创建新行

from .models import Plants,Order,Nursery
from rest_framework import serializers

class NurserySerializer(serializers.ModelSerializer):
    class Meta:
        model = Nursery
        fields = "__all__"

class PlantSerializer(serializers.ModelSerializer):
    nursery = NurserySerializer(read_only=True)
    # nursery = NurserySerializer()
    class Meta:
        model = Plants
        fields = ['name', 'price','image','nursery']


class OrderSerializer(serializers.ModelSerializer):
    user = serializers.SlugRelatedField(read_only=True,slug_field='username')
    product = PlantSerializer(read_only=True)
    nursery = NurserySerializer(read_only=True)

    class Meta:
        model = Order
        fields = ['user', 'product','date_ordered','order_id','is_purchased','cost','quantity','nursery']