django - 无效的 pk(模型对象)不存在 - Django REST Framework

Question

我想创建商家并添加银行账户详细信息。

这些是我的序列化器:

class MerchantSerializer(core_serializers.BaseModelSerializer):
    """
    MerchantSerializer
    """
    bank_account_details = serializers.JSONField()
    merchant_entity_id = serializers.UUIDField()

    class Meta:
        model = paylater_models.Merchant
        fields = ('merchant_entity_id', 'bank_account_details',)

    def create(self, validated_data):
        """
        create
        :param validated_data:
        :return:
        """

        # with transaction.atomic():
        # Normalizing and separating information
        bank_account_data = validated_data.pop('bank_account_details')
        validated_data.update({'merchant_number': core_utils.generate_alphanumeric_strings()})

        # Creating merchant instance
        instance = super(MerchantSerializer, self).create(validated_data)

        # Creating bank account details for the newly created merchant
        bank_account_data.update({'merchant': instance})
        bank_account_serializer = BankAccountDetailSerializer(data=bank_account_data)
        bank_account_serializer.is_valid(raise_exception=True)
        bank_account_serializer.save()

        return instance


class BankAccountDetailSerializer(core_serializers.BaseModelSerializer):
    """
    BankAccountDetailSerializer
    """

    bank_name = serializers.CharField(max_length=256)
    account_number = serializers.CharField(max_length=18)
    ifsc = serializers.CharField(max_length=11)

    class Meta:
        model = paylater_models.BankAccountDetail
        fields = ('bank_name', 'account_number', 'ifsc', 'merchant',)

    def validate_account_number(self, account_number):
        """
        validate_account_number
        :param bank_name:
        :return:
        """

        if re.search('[0-9]{9,18}', str(account_number)) is not None:
            return account_number

        raise paylater_exceptions.InvalidBankAccountNumberError()

    def validate_ifsc(self, ifsc):
        """
        validate_ifsc
        :param ifsc:
        :return:
        """

        if re.search('[A-Za-z]{4}[a-zA-Z0-9]{7}', ifsc) is not None:
            return ifsc

        raise paylater_exceptions.InvalidIFSCError()

它给了我一个无效的 pk \"Merchant object (f7f3f77a-7f18-4a27-ac39-1f182d233006)\" - 对象不存在。

我在这里做错了什么？

我知道问题出在我传递给 BankAccountDetailSerializer 的商户实例上，但我真的不知道它是什么以及如何解决这个问题。

Answer 1

解决方案非常简单，您只需使用 merchant.pk 而不是 merchant 对象。试试这个:

bank_account_data.update({'merchant': instance.pk})

用上面的行替换商户序列化器创建函数中的当前行。它应该可以工作。

请记住，当您想向模型序列化程序提供相关对象时，它应该是主键。除非您使用嵌套序列化程序。