如何在Golang中实现导出字段的设置器？

Question

I'm using gorm lib and to use that lib, I have to export all column fields. Something like this

type myType struct {
  Id int
  Name string
}

But with that, how to I deal with addition logics for struct fields. Let's say, what if I want to prefix Mr to the Name field? The client can always do myType.Name = "whatever". If I make Name to be unexported and have setter for it, that field will never work with gorm. Any golang-way to deal with this?

Answer 1

Your understanding is correct about unexported field with method.

Your struct Fields have to be exported then only gorm will have access to it. That is Go way.

So you have 2 options.

Option 1: taking advantage of gorm callback AfterFind. Basically your struct have to implement this callback. After find you have to update the field Name.

Option 2: Implement as part of your data fetch method. Update the field Name before returning to the caller.