禁止未知值？

Question

如果负载中的值不在模式中，我可以用漏勺报错吗？因此，只允许列入白名单的字段？

这是一个示例：

# coding=utf-8
from colander import MappingSchema, String, Length
from colander import SchemaNode


class SamplePayload(MappingSchema):
    name = SchemaNode(String())
    foo  = SchemaNode(Int())


class Sample(MappingSchema):
    type = SchemaNode(String(), validator=Length(max=32))
    payload = SamplePayload()

# This json should not be accepted (and should yield something like: Unknown field in payload: bar

{  
   "type":"foo",
   "payload":{  
      "name":"a name",
      "foo":123,
      "bar":false
   }
}

Answer 1

是，见the docs of colander.Mapping

使用 colander.Mapping(unknown='raise') 创建映射将导致 colander.Invalid 在反序列化期间结构中存在未知键时引发异常。

根据issue 116 in the tracker，将其应用于架构对象的方法是覆盖schema_type方法：

class StrictMappingSchema(MappingSchema):
    def schema_type(self, **kw):
        return colander.Mapping(unknown='raise')

class SamplePayload(StrictMappingSchema):
    name = SchemaNode(String())
    foo  = SchemaNode(Int())

禁止未知值？

Prohibit unknown values?

python

colander