django - making .create（）支持可寫的嵌套字段？

Question

因此，在Django中，.create（）不支持可寫嵌套字段。但是，我的項目中有一個嵌套字段。我看了一下this question，這很有幫助，但是我現在在/ transactions/ 處得到一個ValueError，用於int（），其基數爲10：'Product001'。據我所知，這是由線serializer.py讀取

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

具體而言，「SKU」值我在那裏造成的。我的問題是，我應該在那裏置換'sku'的價值？這個問題的答案是基於我的代碼使用「事件」，但這不是我項目中模型的一部分。我也嘗試使用'產品'，並得到了一個TypeError，sadi「int（）參數必須是字符串，類似字節的對象或數字，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

您可以找到有關可寫嵌套系列化here細節。

關於你提到的情況下，你可以從product字典獲得產品的sku數據：

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