序列化 Django Rest 框架时的附加字段

我是 django 休息框架的新手，并创建了一个示例Employee model.

My 模型.py:

class Employees(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    first_name = models.CharField(max_length=100)
    last_name = models.CharField(max_length=100)

My 序列化器.py:

class EmployeeSerializer(serializers.Serializer):
    class Meta:
        model = Employees
        fields = ('first_name','last_name')

这工作正常，但我想要一个额外的字段full_name，这将是first_name + last_name.

我如何定义这个新字段full_name in my serializers.py?

我在这里看到两种方法（我更喜欢第一种方法，因为您可以在应用程序的其他部分重用它）：

将计算属性添加到模型中并将其添加到序列化器中通过使用带有 source= 的只读字段 http://www.django-rest-framework.org/api-guide/fields#core-arguments

# models.py
class Employees(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    first_name = models.CharField(max_length=100)
    last_name = models.CharField(max_length=100)

    @property
    def full_name(self):
        return self.first_name + self.last_name

# serializers.py
class EmployeeSerializer(serializers.ModelSerializer):
    full_name = serializers.Field(source='full_name')

    class Meta:
        model = Employees
        fields = ('first_name','last_name', 'full_name')

通过使用序列化方法字段 http://www.django-rest-framework.org/api-guide/fields#serializermethodfield（你的模型不变）

class EmployeeSerializer(serializers.ModelSerializer):
    full_name = serializers.SerializerMethodField('get_full_name')

    def get_full_name(self, obj):
        return obj.first_name + obj.last_name

    class Meta:
        model = Employees
        fields = ('first_name','last_name', 'full_name')