错误复现

serializers.py

class LoginSerializer(serializers.Serializer):

    username = serializers.CharField(min_length=5, max_length=10, help_text="账号")
    password = serializers.CharField(min_length=5, max_length=10, help_text="密码")

    # 校验用户名
    def validate_username(self, value):
        if not re.match(r'^[a-zA-Z0-9_-]{5,10}$', value):
            raise serializers.ValidationError("请输入5-20的用户名！")

    # 校验密码
    def validate_password(self, value):
        if not re.match(r'^[a-zA-Z0-9_-]{6,10}$', value):
            raise serializers.ValidationError("请输入6-20的密码！")

view.py

class LoginGenericAPIView(GenericAPIView):

    queryset = User.objects.all()
    serializer_class = LoginSerializer

    permission_classes = [AllowAny]

    def post(self, request):
        # 获取序列化器
        serializer = self.get_serializer(data=request.data)
        print(request.data)
        # 验证数据
        if not serializer.is_valid():
            return Response(serializer.errors)

        print(serializer)
        print(serializer.data)
        return Response(serializer.data)

错误

请求可以获取到value但是验证完毕数据一直为None

解决方案

一定不要像我一样粗心

validate_<field_name>验证完毕没有返回Value

正确的代码

class LoginSerializer(serializers.Serializer):

    username = serializers.CharField(min_length=5, max_length=10, help_text="账号")
    password = serializers.CharField(min_length=5, max_length=10, help_text="密码")

    # 校验用户名
    def validate_username(self, value):
        if not re.match(r'^[a-zA-Z0-9_-]{5,10}$', value):
            raise serializers.ValidationError("请输入5-20的用户名！")
        return value
    
    # 校验密码
    def validate_password(self, value):
        if not re.match(r'^[a-zA-Z0-9_-]{6,10}$', value):
            raise serializers.ValidationError("请输入6-20的密码！")
        return value