ModelSerializer使用模型属性 [英] ModelSerializer using model property

问题描述

我正在尝试序列化一个包含一个我想要序列化的属性字段的模型。

I'm trying to serialize a model containing a property field that I also want to serialize.

models.py：

models.py:

class MyModel(models.Model):
    name = models.CharField(max_length=100)
    slug = models.AutoSlugField(populate_from='name')

    @property
    def ext_link(self):
        return "/".join([settings.EXT_BASE_URL, self.slug])

serializers.py：

serializers.py:

class MyModelSerializer(serializers.ModelSerializer):
    class Meta:
        model = MyModel
        fields = ('name', 'ext_link')

相关的URL，我在 ext_link 属性上收到一个序列化程序异常（KeyError）。

When trying to get to the related URL, I'm getting a serializer exception (KeyError) on the ext_link property.

如何序列化 ext_link 属性？

推荐答案

因为它不是一个模型字段，它需要明确地添加到序列化器类

Because it's not a model field, it needs to be added explicitly to the serializer class

class MyModelSerializer(serializers.ModelSerializer):
    ext_link = serializers.Field()

    class Meta:
        model = MyModel
        fields = ('name', 'ext_link')

编辑：在REST框架中添加$ code> fields 只会工作 - 不需要显式添加该字段。

In REST framework 3 adding to fields will just work - don't need to add the field explicitly.

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