python django rest框架。如何以某种特定格式序列化外键UUID？

Question

我有两个模型A和B，它们都具有UUID作为主键。 B中有一个与A相关的外键。

class A(models.Model):
    id = models.UUIDField(primary_key=True, editable=False)
    desc = models.CharField(max_length=128, null=True)

class B(models.Model):
    id = models.UUIDField(primary_key=True, editable=False)
    desc = models.CharField(max_length=128, null=True)
    for_key = models.ForeignKey(A, on_delete=models.SET_NULL, null=True)

这是我的序列化器，

class ASerializer(serializers.ModelSerializer):
    id = serializers.UUIDField(format='hex')
    class Meta:
        model = A
        fields = ('id', 'desc')

class BSerializer(serializers.ModelSerializer):
    id = serializers.UUIDField(format='hex')
    class Meta:
        model = B
        fields = ('id', 'desc', 'for_key')

如您所见，我将uuid（主键）更改为十六进制格式。但是for_key的格式为默认格式（hex_verbose）。 那么如何将模型B中的外键 for_key序列化为 hex 格式？

Answer 1

在DRF中的关系上进行序列化时，只需call the serializer in the second model。

class ASerializer(serializers.ModelSerializer):
    id = serializers.UUIDField(format='hex')
    class Meta:
        model = A
        fields = ('id', 'desc')

class BSerializer(serializers.ModelSerializer):
    id = serializers.UUIDField(format='hex')
    for_key = ASerializer(many=True, read_only=True)
    class Meta:
        model = B
        fields = ('id', 'desc', 'for_key')

Answer 2

如果您希望能够指定for_key，那么您将无法使用@Withnail的答案，因为for_key是只读的。 您应该使用。

  class BSerializer(serializers.ModelSerializer):
    id = serializers.UUIDField(format='hex')
    for_key = serializers.PrimaryKeyRelatedField(queryset=A.objects.all())

    class Meta:
        model = B
        fields = ('id', 'desc', 'for_key')

Answer 3

您正在寻找的是：

class BSerializer(serializers.ModelSerializer):
    id = serializers.UUIDField(format='hex')
    for_key = serializers.UUIDField(format='hex', source='for_key.id')
    class Meta:
      model = B
      fields = ('id', 'desc', 'for_key')