提交的图像返回null

Question

我有一个这样的模型；我正在尝试使用以下字段创建注册： username first name last name email address profile image

class User(AbstractUser):
    username = models.CharField(blank=True, null=True, max_length=50)
    Email = models.EmailField(_('email address'), unique=True)
    Address = models.CharField(max_length=100, default="")
    UserProImage = models.ImageField(upload_to='accounts/',blank=True, null=False)

    USERNAME_FIELD = 'username'
    REQUIRED_FIELDS = ['Email', 'first_name', 'last_name', 'Address', 'UserProImage']

    def __str__(self):
        return "{}".format(self.username)

    def get_image(self, obj):
        try:
            image = obj.image.url
        except:
            image = None
        return image

    def perform_create(self, serializer):
        serializer.save(img=self.request.data.get('UserProImage'))

为此模型，我编写了一个序列化器，如下所示：

class UserCreateSerializer(ModelSerializer):
    Email = EmailField(label='Email Address')
    ConfirmEmail = EmailField(label='Confirm Email')

    class Meta:
        model = User
        fields = [
            'username',
            'first_name',
            'last_name',
            'Address',
            'UserProImage',
            'Email',
            'ConfirmEmail',
            'password',

        ]
        extra_kwargs = {"password":
                            {"write_only": True}
                        }

    objects = PostManager()

    def __unicode__(self):
        return self.username

    def __str__(self):
        return self.username

    def validate(self, data):
        return data

    def perform_create(self, serializer):
        serializer.save(self.request.data.get('UserProImage'))
        return self.data.get('UserProImage')

    def validate_email(self, value):
        data = self.get_initial()
        email1 = data.get('ConfirmEmail')
        username = data.get('username')
        email2 = value
        if email1 != email2:
            raise ValidationError("Emails must match.")

        user_qs = User.objects.filter(email=email2)
        username_qs = User.objects.filter(username=username)
        if user_qs.exists():
            raise ValidationError("This user has already registered.")
        if username_qs.exists():
            raise ValidationError("This user has already registered.")
        return value

    def validate_email2(self, value):
        data = self.get_initial()
        email1 = data.get('Email')
        email2 = value
        if email1 != email2:
            raise ValidationError("Emails must match.")
        return value

    def create(self, validated_data):
        username = validated_data['username']
        email = validated_data['Email']
        password = validated_data['password']
        user_obj = User(
            username=username,
            email=email
        )
        user_obj.set_password(password)
        user_obj.save()
        return validated_data

当我运行服务器imagefiled(UserProImage)为null时，该如何解决？