django - 制作 .create() 支持可写嵌套字段？

Question

所以在 Django 中，.create() 不支持可写嵌套字段。但是，我的项目中有一个嵌套字段。我查看了this question，这很有帮助，但我现在在 /transactions/ 处遇到了 ValueError 基数为 10 的 int() 的无效文字：“Product001”。据我所知，这是由 serializer.py 中的

行引起的

product = Product.objects.get(pk=validated_data.pop('sku'))

具体来说，我在其中的“sku”值。我的问题是，我应该放什么值来替换“sku”？我的代码基于使用的“事件”的问题的答案，但这不是我项目中模型的一部分。我也尝试过使用“产品”，并得到一个 TypeError，即 sadi“int() 参数必须是字符串、类似字节的对象或数字，而不是 'collections.OrderedDict'”。

serializers.py

from .models import Product, Family, Location, Transaction
from rest_framework import serializers

class LocationSerializer(serializers.ModelSerializer):
  class Meta:
    model = Location
    fields = ('reference', 'title', 'description')

class FamilySerializer(serializers.ModelSerializer):
  class Meta:
    model = Family
    fields = ('reference', 'title', 'description', 'unit', 'minQuantity')

class ProductSerializer(serializers.HyperlinkedModelSerializer):
  class Meta:
    model = Product
    fields = ('sku', 'barcode', 'title', 'description', 'location', 'family')
    depth = 1

class TransactionSerializer(serializers.ModelSerializer):
  product = ProductSerializer()
  class Meta:
    model = Transaction
    fields = ('sku', 'barcode', 'product')

  def create(self, validated_data):
    product = Product.objects.get(pk=validated_data.pop('sku'))
    instance = Transaction.objects.create(**validated_data)
    return instance

  def to_representation(self, instance):
    representation = super(TransactionSerializer, self).to_representatio
n(instance)
    return representation;

models.py

from __future__ import unicode_literals

from django.db import models

# Create your models here.

class Product(models.Model):

    sku = models.CharField(max_length=13,help_text="Enter Product Stock Keeping Unit")
    barcode = models.CharField(max_length=13,help_text="Enter Product Barcode (ISBN, UPC ...)")

    title = models.CharField(max_length=200, help_text="Enter Product Title")
    description = models.TextField(help_text="Enter Product Description")

    unitCost = models.FloatField(help_text="Enter Product Unit Cost")
    unit = models.CharField(max_length=10,help_text="Enter Product Unit ")

    quantity = models.FloatField(help_text="Enter Product Quantity")
    minQuantity = models.FloatField(help_text="Enter Product Min Quantity")

    family = models.ForeignKey('Family')
    location = models.ForeignKey('Location')

    def get_absolute_url(self):
        """
        Returns the url to access a particular instance of Product.
        """
        return reverse('product-detail-view', args=[str(self.id)])

    def __str__(self):

        return self.title

class Family(models.Model):

    reference = models.CharField(max_length=13, help_text="Enter Family Reference")
    title = models.CharField(max_length=200, help_text="Enter Family Title")
    description = models.TextField(help_text="Enter Family Description")

    unit = models.CharField(max_length=10,help_text="Enter Family Unit ")

    minQuantity = models.FloatField(help_text="Enter Family Min Quantity")

    def get_absolute_url(self):
        """
        Returns the url to access a particular instance of Family.
        """
        return reverse('family-detail-view', args=[str(self.id)])

    def __str__(self):

        return self.title

class Location(models.Model):

    reference = models.CharField(max_length=20, help_text="Enter Location Reference")
    title = models.CharField(max_length=200, help_text="Enter Location Title")
    description = models.TextField(help_text="Enter Location Description")

    def get_absolute_url(self):
        """
        Returns the url to access a particular instance of Location.
        """
        return reverse('family-detail-view', args=[str(self.id)])

    def __str__(self):

        return self.title

class Transaction(models.Model):

    sku = models.CharField(max_length=13,help_text="Enter Product Stock Keeping Unit")
    barcode = models.CharField(max_length=13,help_text="Enter Product Barcode (ISBN, UPC ...)")

    comment = models.TextField(help_text="Enter Product Stock Keeping Unit")

    unitCost = models.FloatField(help_text="Enter Product Unit Cost")

    quantity = models.FloatField(help_text="Enter Product Quantity")

    product = models.ForeignKey('Product')

    date = models.DateField(null=True, blank=True)

    REASONS = (
        ('ns', 'New Stock'),
        ('ur', 'Usable Return'),
        ('nr', 'Unusable Return'),
    )


    reason = models.CharField(max_length=2, choices=REASONS, blank=True, default='ns', help_text='Reason for transaction')

    def get_absolute_url(self):
        """
        Returns the url to access a particular instance of Product.
        """
        return reverse('transaction-detail-view', args=[str(self.id)])

    def __str__(self):

        return 'Transaction :  %d' % (self.id)

Answer 1

您可以找到有关可写嵌套序列化here 的详细信息。

关于您的情况，您可以从product dict 获取产品的sku 数据：

def create(self, validated_data):
   product_data = validated_data.pop('product')
   try:
       product = Product.objects.get(pk=product_data.get('sku'))
   except Product.DoesNotExist:
       product = Product.objects.create(**product_data)

   instance = Transaction.objects.create(**validated_data)
   instance.product = product
   instance.save()
   return instance