在反射中迷失的golang

Question

I am traing to abstract a rest API with go lang but i totally stuck in the reflection part.

    log.Printf("handleIndex resourceType = %v", res.resourceType)

slice := reflect.MakeSlice(reflect.SliceOf(res.resourceType), 0, 0)
err := res.api.DB.Select(&slice, "SELECT * FROM domains")
if err != nil {
    log.Printf("SQL Error %s", err)
}
fmt.Printf("
=================================== 
%#v 
=================================== ", slice)

resourceType is a reflect.Type of the model

res.api.DB is sqlx.DB

Output of the code is :

handleIndex resourceType = main.Domain

SQL Error expected slice but got struct

[]main.Domain{}

so basically even i make a slice of reflect.Type i got a struct What i am missing ?

Answer 1

You're passing a pointer to a reflect.Value into your Select call. A reflect.Value is a struct, which is why you're receiving this error.

Instead, create a new pointer of the type you want using reflect.New

slice := reflect.New(reflect.SliceOf(res.resourceType))
err := res.api.DB.Select(slice.Interface(), "SELECT * FROM domains")