如何在DRF中序列化通用外键 [英] How to Serialize generic foreign key In DRF

问题描述

我有一个带有通用外键的模型，我想对该模型进行序列化。

I have model with generic foreign key and I want to serialize that model.

model.py ：

class AddressType(models.Model):
    content_type = models.ForeignKey(ContentType)
    object_id = models.PositiveIntegerField()
    content_object = GenericForeignKey('content_type','object_id')

    def __unicode__(self):
        return u'%s' % str(self.content_type)

class AddressBook(TimeStampedModel):
    class Meta:
        db_table = 'address_book'

    uuid = UUIDField(auto=True)
    address_tag = models.CharField(null=True, blank=True, max_length=20)

    # should be a generic foreign key
    address_object_type = GenericRelation(AddressType)
    address1 = models.CharField(
        verbose_name='Address1',
        max_length=200,
    )
    address2 = models.CharField(
        verbose_name='Address2',
        max_length=200,
    )

serializer.py ：

class AddressBookSerializer(serializers.ModelSerializer):
    class Meta:
        model = AddressBook
        fields = ('id','uuid','address_tag','address_object_type','address1','address2')

如何在上述模型上序列化JSON？

How can I serialize JSON on above model?

推荐答案

文档。

因此，如果要序列化 AddressType ，则需要实现以下类似内容：

So if you want to serialize AddressType you will need to implement something like this:

class ContentObjectRelatedField(serializers.RelatedField):
    """
    A custom field to use for the `content_object` generic relationship.
    """

    def to_representation(self, value):
        """
        Serialize tagged objects to a simple textual representation.
        """
        if isinstance(value, Bookmark):
            return 'Bookmark: ' + value.url
        elif isinstance(value, Note):
            return 'Note: ' + value.text
        raise Exception('Unexpected type of tagged object')

其中书签和 Note 是可能具有关联内容的对象。

Where Bookmark and Note are objects which may be have associated contents.

如果要序列化 AddressBook ，可以尝试执行以下操作：

If you want to serialize AddressBook you can try doing something like this:

class AddressBookSerializer(serializers.ModelSerializer):
    address_object_type = ContentObjectRelatedField()
    class Meta:
        model = AddressBook
        fields = ('id','uuid','address_tag','address_object_type','address1','address2')

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