Question

我有两个django模型

模型A

class B(models.Model):
    bname = models.CharField(max_length=64, verbose_name='name')
    mod = models.ForeignKey(A, related_name='a_b',null=True,on_delete=models.CASCADE)

和模型B

class BSerializer(serializers.ModelSerializer):
mod= ASerializer(many=False, read_only=True)
class Meta:
    model = B
    fields = (','id','bname','mod.aname')

模型B的序列化器是

mod.aname

我希望使用模型B的序列化程序访问模型A的 aname 字段。使用mod.aname不起作用。它说

字段名B对模型INSERT INTO PAYMENT ( OWNER_HI, ACCOUNT_ID, DATE_PAYMENT, ACCOUNT_VALUE_BEFORE, CURRENCY,EXCHANGE_RATE, SUM, SUM_USD, DATE_INPUT, OPERATOR_ID, DOCUMENT, INVOICE_ID) VALUES ( OWNER, ID, TO_CHAR(SYSDATE, 'YYYY-MM-DD'), (SELECT VALUE FROM ACCOUNT WHERE ACCOUNT_ID = 386), (SELECT CURRENCY_IDCURRENCY_ID FROM CURRENCY_EXCHANGE WHERE rownum=1 ORDER BY CURRENCY_ID DESC), (SELECT EXCHANGE_RATE FROM CURRENCY_EXCHANGE WHERE rownum=1 ORDER BY CURRENCY_ID DESC), 50, (50 * RATE), TODAY, 386, 'teste sis', null);无效。

我该怎么做？

Answer 1

这个怎么样？在source内使用参数serializers.CharField：

class BSerializer(serializers.ModelSerializer):
    mod = serializers.CharField(
        source='mod.aname',
        read_only=True
    )

    class Meta:
        model = B
        fields = ('id','bname','mod')

Answer 2

在将相关模型的字段引用为字符串时使用两个下划线，例如'mod__aname'。

class HotelSerializer(serializers.ModelSerializer):
    mod= ASerializer(many=False, read_only=True)

    class Meta:
        model = Hotel
        fields = ('id','bname','mod__aname')

如果ASerializer看起来像这样，这应该有效：

class ASerializer(serializers.ModelSerializer):

    class Meta:
        model = A
        fields = '__all__'

如何访问Django ForeignKey模型字段？

2 个答案: