我想扩展go-validator以返回更好的类型:
type Error map[string][]error
// Will output the first error when stringified (e.g. for json response).
func (err Error) Error() string {
for k, errs := range err {
return fmt.Sprintf("%s value had %s", k, errs[0].Error())
}
return "no error"
}
func Validate(v interface{}) error {
if ok, errs := DefaultValidator.Validate(v); !ok {
return Error(errs)
}
return nil
}
当我现在为此编写测试时,我遇到了这个问题,它的类型化映射Error
似乎已经失去了它的索引能力:
err = Validate(Value{
Foo: "bar",
Email: "foo@bar.me",
Required: "1234",
})
c.Check(err, check.IsNil)
err, ok := Validate(Value{}).(Error)
c.Check(ok, check.Equals, true)
c.Check(err["Foo"], check.DeepEquals, []error{validator.ErrMin})
c.Check(err["Email"], check.DeepEquals, []error{validator.ErrInvalid})
c.Check(err["Required"], check.DeepEquals, []error{validator.ErrZeroValue})
的回报:
model/validation/validation_test.go:42: invalid operation: err["Foo"] (type error does not support indexing)
model/validation/validation_test.go:43: invalid operation: err["Email"] (type error does not support indexing)
model/validation/validation_test.go:44: invalid operation: err["Required"] (type error does not support indexing)
我也试图转换为类型map[string][]error
,但得到"不可能的类型断言"。
我的方法有什么问题?如何使索引恢复工作?
似乎你的err变量是用error
类型初始化的。当你做
err, ok := Validate(Value{}).(Error)
仅仅检查err是否实际上是一个Error
。如果你把这里的err改成errors,它应该可以工作。
Playground示例:http://play.golang.org/p/ljNroPzVbd