[英]django custom serializer field not working
I am trying to add an additional field in the serializer but at the moment of adding it I get the following error error view我正在尝试在序列化程序中添加一个附加字段,但在添加它的那一刻,我得到以下错误错误视图
During handling of the above exception ('MovieSerializer' object has no attribute 'len_name')在处理上述异常期间('MovieSerializer' object 没有属性 'len_name')
I have seen many posts and all of them are working, what could it be?我看过很多帖子,所有帖子都在工作,可能是什么?
this is my code这是我的代码
Model: Model:
from django.db import models
class Movie(models.Model):
title = models.CharField(max_length=255, unique=True)
description = models.TextField()
active = models.BooleanField(default=True)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(default=None, null=True)
def __str__(self):
return self.title
serializer:序列化器:
from rest_framework import serializers
from watchlist_app.models import Movie
from watchlist_app.api.validations import MovieValidations
class MovieSerializer(serializers.ModelSerializer):
len_name = serializers.SerializerMethodField(method_name='len_name')
class Meta:
model = Movie
fields = "__all__"
read_only_fields = ['id', 'len_name', 'created_at']
required_fields = ['title', 'description']
@staticmethod
def create(self, validated_data):
return Movie.objects.create(**validated_data)
@staticmethod
def update(self, instance, validated_data):
instance.title = validated_data.get('title', instance.title)
instance.description = validated_data.get('description', instance.description)
instance.active = validated_data.get('active', instance.active)
instance.save()
return instance
@staticmethod
def get_len_name(self, obj):
return len(obj.title)
validators = [MovieValidations.validate_title, MovieValidations.validate_description,
MovieValidations.validate_equals]
everything works fine until I add the serializerMethodField在我添加 serializerMethodField 之前一切正常
I think you set the function in the wrong place.我认为您将 function 设置在错误的位置。 The function needs to belong to the
MovieSerializer
. function 需要属于
MovieSerializer
。
from rest_framework import serializers
from watchlist_app.models import Movie
from watchlist_app.api.validations import MovieValidations
class MovieSerializer(serializers.ModelSerializer):
len_name = serializers.SerializerMethodField()
class Meta:
model = Movie
fields = "__all__"
...
def get_len_name(self, obj):
return len(obj.title)
use extra_fields in meta class在元 class 中使用 extra_fields
class MovieSerializer(serializers.ModelSerializer):
len_name = serializers.SerializerMethodField(method_name='len_name')
class Meta:
model = Movie
fields = "__all__"
extra_fields = ['len_name',]
read_only_fields = ['id', 'len_name', 'created_at']
required_fields = ['title', 'description']
*** your serializer methods in wrong indent,fix it -> Go back one indent and remode staticmethod decorator *** ***您的序列化程序方法缩进错误,修复它-> Go 后退一个缩进并修改静态方法装饰器***
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