如何在Golang中使用字符串新建对象

Question

How can I create an object when I am only having its type in string? I am looking for something like:

type someStruct struct {}

resultObject := new "someStruct"

It will be really helpful and convenience with this when using different ORM library like GORP and GORM.

Is it possible to do it in Golang?

Answer 1

No...

Well, the answer is "yes, but" and it's a big but. There's no central registry of struct names in Go. You're not going to get a nice, clean standard library function called StructFromName(string) which is probably what you were hoping for.

Instead, you have to write that mapping yourself, something like

func StringToStruct(name string) (interface{}, error) {
    switch name {
    case "SomeStruct":
        return SomeStruct{}, nil
    case "SomeOtherStruct":
        return SomeOtherStruct{}, nil
    case "subpackage.Struct":
        return subpackage.Struct{}, nil
    default:
        return nil, fmt.Errorf("%s is not a known struct name", name)
    }
}