How to get the tags from a struct field in Go? I have a nested struct which I want to pass as an argument to another function and read the tags there. I know that by accessing it as a field is possible, but I am searching for a way to it.
type MyStruct struct {
Nested struct{} `bson:"nested"`
}
func main() {
val := reflect.ValueOf(MyStruct{})
val.Type().Field(0).Tag.Get("bson") // I want to avoid this
val := reflect.ValueOf(MyStruct{}.Nested)
val.Tag???
}
The tag you want to access belongs to MyStruct. If you pass the value of the Nested field, a copy is made which will be completely detached from MyStruct. There's no way to tell if the value passed originates from a field of MyStruct or from another struct, or from any other source (e.g. from a composite literal). So this is not possible.