序列化相关模型并覆盖create方法

Question

我是 DRF 的新手，我想做一些类似于 django 表单中的表单集的事情 我有一个Invoice 和Products 彼此相关的模型抛出多对多InvoiceDetail 模型.. 当我创建发票时，我选择一些产品并为每个产品创建一个InvoiceDetail 对象.. 我想做这在 DRF 中如何序列化 Invoice 模型并创建函数呢？ 还是我应该这样做？

models.py：

 class Invoices(models.Model):
     #some fields
     products = models.ManyToManyField('Products', through='InvoiceDetail')


class Products(models.Model):
    #some fields


class InvoiceDetail(models.Model):
    invoice = models.ForeignKey(Invoices, related_name='parent_invoice')
    product = models.ForeignKey(Products, related_name='parent_product')
    product_description = models.TextField()
    product_price = models.DecimalField(max_digits=9, decimal_places=2)
    quantity_sold = models.IntegerField()

serializers.py:

class ProductsSerializer(serializers.ModelSerializer):
    class Meta:
        model = Products
        fields = ('barcode', 'product_code', 'name', 'description', 'category',
                  'quantity_in_stock', 'quantity_on_hold', 'expire_date',
                  'vendor', 'manufacturer', 'discount')


class InvoiceDetailsSerializer(serializers.ModelSerializer):
    class Meta:
        model = InvoiceDetail
        fields = '__all__'

view.py：

class ProductsView(viewsets.ReadOnlyModelViewSet):
    queryset = Products.objects
    serializer_class = ProductsSerializer


class InvoicesView(viewsets.ModelViewSet):
    queryset = Invoices.objects
    serializer_class = InvoicesSerializer



class InvoiceDetailView(viewsets.ModelViewSet):
    queryset = InvoiceDetail.objects
    serializer_class = InvoiceDetailsSerializer

Answer 1

您可以在序列化程序本身中执行此操作，

class InvoiceSerializer(serializers.ModelSerializer):
    products = serializers.PrimaryKeyRelatedField(queryset=Product.objects.all(), many=True)
    class Meta:
        model = Invoice
        fields = [ f.name for f in model._meta.fields ] + ['products']

    def create(self, validated_data):
        products = validated_data.pop('products')
        invoice = super(InvoiceSerializer, self).create(validated_data)
        for product in products:
            InvoiceDetail.objects.create(invoice=invoice, product=product)
        return invoice

这只是一个了解其工作原理的基本示例。您可以根据需要对其进行自定义。