Django SerializerMethodField can'；不要保存小数点

因此，根据文档，SerializerMethodField是一个只读字段

就我而言，这妨碍了我的写作：

# old value is 2.5
data={'score': 1.7}
serializer = ScoreTraitSerializer(
        score_trait, data=data, partial=True)
    if serializer.is_valid():
        new_score_trait = serializer.save()

现在如果我检查

new\u score\u trait

，我的分数仍然是

2.5

序列化程序的外观如下所示：

score = serializers.SerializerMethodField()

def get_score(self, obj):
    if isinstance(obj.score, decimal.Decimal):
        return float(obj.score)
    else:
        return obj.score

如果我注释掉我的

SerializerMethodField

，我可以保存新的十进制值（但不能序列化它）

所以。。。我是否正确使用序列化程序？为什么我对序列化程序的写入会点击

SerializerMethodField

---

提前感谢

SerializerMethodField

是只读字段。仅用于

to_表示

，用于

列表/检索

而不是

创建/更新

序列化程序字段分数必须与模型字段分数冲突，请尝试将其更改为：

float_score = serializers.SerializerMethodField(required=False)

def get_float_score (self, obj):
    if isinstance(obj.score, decimal.Decimal):
        return float(obj.score)
    else:
        return obj.score

---

查看源代码，您将知道原因：

class SerializerMethodField(Field):
    """
    A read-only field that get its representation from calling a method on the
    parent serializer class. The method called will be of the form
    "get_{field_name}", and should take a single argument, which is the
    object being serialized.

    For example:

    class ExampleSerializer(self):
        extra_info = SerializerMethodField()

        def get_extra_info(self, obj):
            return ...  # Calculate some data to return.
    """
    def __init__(self, method_name=None, **kwargs):
        self.method_name = method_name
        kwargs['source'] = '*'
        kwargs['read_only'] = True
        super(SerializerMethodField, self).__init__(**kwargs)

---

所以序列化程序将检索“float_score”字段，但我将保存原始的“score”字段？