duanpu4143 2014-06-09 08:37
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如何在Golang中使用字符串新建对象

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?

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  • doudui6756 2014-06-09 08:53
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    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)
        }
    }
    
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