Django rest framework 提交的数据不是文件。请检查drf中表单上的编码类型错误

我已经创建了一个

模型

和

序列化程序

，但它给出了一个错误

提交的数据不是文件检查表单上的编码类型

。 模型是-

class UserProfile(models.Model):
profile_image = models.ImageField(blank=True, upload_to='user/profile_img', null=True,default=None)
phone = models.CharField( max_length=20, null=True, blank=True)
date_of_birth = models.DateField(null=True, blank=True)
city = models.CharField(max_length=50, null=True, blank=True)
country = models.CharField(max_length=50, null=True, blank=True)
zip = models.CharField(max_length=15, null=True, blank=True)
active = models.BooleanField()
user = models.OneToOneField(settings.AUTH_USER_MODEL,on_delete=models.CASCADE,related_name='profile')

序列化程序是-

class UserSerializer(serializers.HyperlinkedModelSerializer):
profile = UserProfileSerializer(required=True)
username = serializers.CharField(label="username field",
                                 required=True, allow_null=False,
                                 allow_blank=False)

class Meta:
    model = User
    fields = ('id', 'username', 'email', 'first_name', 'last_name', 'password', 'profile')
    extra_kwargs = {'password': {'write_only': True}, 'first_name': {'required': True},
                    'last_name': {'required': True}}

def create(self, validated_data):
    profile_data = validated_data.pop('profile')
    password = validated_data.pop('password')
    try:
        if User.objects.filter(username__iexact=User(**validated_data).username).exists():
            raise serializers.ValidationError("username already exists")
    except Exception as e:
            error = {'message': ",".join(e.args) if len(e.args) > 0 else 'Unknown Error'}
            raise serializers.ValidationError(error)
    user = User(**validated_data)
    user.set_password(password)
    user.save()
    UserProfile.objects.create(user=user, **profile_data)
    return user

def update(self, instance, validated_data):
    profile_data = validated_data.pop('profile')
    profile = instance.profile
    username = validated_data.get('username', instance.username)
    if instance.username != username:
        instance.username = validated_data.get('username', instance.username)
        try:
            if User.objects.filter(username__iexact=instance.username).exists():
                raise serializers.ValidationError("username already exists")
        except Exception as e:
                error = {'message': ",".join(e.args) if len(e.args) > 0 else 'Unknown Error'}
                raise serializers.ValidationError(error)
    instance.first_name = validated_data.get('first_name', instance.first_name)
    instance.last_name = validated_data.get('last_name', instance.last_name)
    instance.save()
    profile.profile_image = profile_data.get('profile_image', profile.profile_image)
    profile.phone = profile_data.get('phone', profile.phone)
    profile.date_of_birth = profile_data.get('date_of_birth', profile.date_of_birth)
    profile.country = profile_data.get('country', profile.country)
    profile.city = profile_data.get('city', profile.city)
    profile.zip = profile_data.get('zip', profile.zip)
    profile.active = profile_data.get('active', profile.active)
    profile.save()
    print()
    return instance

错误是-

profile: {profile_image: "the submitted data was not a file check the encoding type on the form"}

我不知道是什么导致了这个错误的发生。有人能帮忙吗