当我在序列化器上调用
ModelSerializer
时,我的 KeyError
收到 .data
,我不知道如何正确修复此错误。
Knox 的 AuthToken 模型看起来像这样
class AuthToken(models.Model):
objects = AuthTokenManager()
digest = models.CharField(
max_length=CONSTANTS.DIGEST_LENGTH, primary_key=True)
token_key = models.CharField(
max_length=CONSTANTS.TOKEN_KEY_LENGTH, db_index=True)
user = models.ForeignKey(User, null=False, blank=False,
related_name='auth_token_set', on_delete=models.CASCADE)
created = models.DateTimeField(auto_now_add=True)
expiry = models.DateTimeField(null=True, blank=True)
def __str__(self):
return '%s : %s' % (self.digest, self.user)
我创建了一个模型序列化器
class AuthTokenResponseSerializer(serializers.ModelSerializer):
class Meta:
model = AuthToken
fields = "__all__"
但是,当我创建
token_serializer
时,我收到此错误
>> token_serializer.data
*** KeyError: "Got KeyError when attempting to get a value for field `user` on serializer `AuthTokenResponseSerializer`.\nThe serializer field might be named incorrectly and not match any attribute or key on the `dict` instance.\nOriginal exception text was: 'user'."
我认为我收到此错误是因为创建
token_serializer
时,它缺少 user
键。我可以看到有一个 user_id
键,但没有 user
(Pdb) token_serializer
AuthTokenResponseSerializer(context={'request': <rest_framework.request.Request: POST '/auth/token/'>}, data={'_state': <django.db.models.base.ModelState object>, 'digest': '6b82ac8776113db376d8938a641c3ebdea573b4ab49cb648c171fccc7f4a517e6450cebb21682e26f36562cf7b659f5089957ba49e99c096ebc9eaaa93ab0e53', 'token_key': '872832f8', 'user_id': 34, 'created': None, 'expiry': datetime.datetime(2024, 5, 11, 9, 17, 2, 540546, tzinfo=datetime.timezone.utc)}, partial=True):
digest = CharField(max_length=128, validators=[<UniqueValidator(queryset=AuthToken.objects.all())>])
token_key = CharField(max_length=8)
created = DateTimeField(read_only=True)
expiry = DateTimeField(allow_null=True, required=False)
user = PrimaryKeyRelatedField(queryset=User.objects.all())
我的用户模型
from django.db import models
from django.utils import timezone
from django.contrib.auth.models import (
AbstractBaseUser,
PermissionsMixin,
BaseUserManager,
)
from django.utils.translation import gettext_lazy as _
from phonenumber_field.modelfields import PhoneNumberField
class User(AbstractBaseUser, PermissionsMixin):
email = models.EmailField(
verbose_name=_("email address"), unique=True, max_length=255
)
password = models.CharField(
max_length=128, null=True
)
first_name = models.CharField(max_length=128, null=True)
last_name = models.CharField(max_length=128, null=True)
phone_number = PhoneNumberField(null=True, blank=True)
is_staff = models.BooleanField(default=False)
is_active = models.BooleanField(default=True)
created_at = models.DateTimeField(default=timezone.now)
updated_at = models.DateTimeField(default=timezone.now)
您遇到的 KeyError 发生是因为序列化器是 期望传递给它的数据中有一个用户字段,但是数据 您提供的只有一个 user_id 键。这种差异可能会出现 如果您要序列化的数据来自不存在的来源 与您的 AuthTokenResponseSerializer 期望的结构完全匹配。
要解决此问题,您可以调整 AuthTokenResponseSerializer 通过将 user_id 显式映射到 用户字段。这可以通过使用 PrimaryKeyRelatedField 来实现 您的序列化器并指定源属性:
AuthTokenResponseSerializer:
from rest_framework import serializers
class AuthTokenResponseSerializer(serializers.ModelSerializer):
user = serializers.PrimaryKeyRelatedField(
queryset=User.objects.all(),
source='user_id' # Map the `user_id` field in incoming data to the `user` relationship
)
class Meta:
model = AuthToken
fields = "__all__"