当golang字段返回给函数调用者时，无法保留其值

Question

I have a function which accepts slice of values and fields as a set of optional parameters and the function maps each value to a field and returns error if any to the caller as in below

func Unmarshall(source []interface{}, dest ...interface{}) error {
    if len(source) != len(dest) {
        return errors.New("source and destination doesn't match")
    }

    for i, s := range source {
        dest[i] = s
    }
    return nil
}

and below the code I have for the caller

for _, r := range rows.Values {
        item := entity.Item{}
        e :=Unmarshall(r,
            &item.Name,
            &item.Description,          
            &item.AddedUTCDatetime,
            &item.ModifiedUTCDatetime)

        if e == nil {           
            items = append(items, item)
        }
    }

But the issue with the above is item.Name,item.Description, &item.AddedUTCDatetime, &item.ModifiedUTCDatetime doesn't retain the values set in the Unmarshall func even though I passed in the pointer to the fields.

Is there anything wrong with the above code?

Answer 1

This one takes care of all types

for i, s := range source {
        so := reflect.ValueOf(s)
        if !reflect.DeepEqual(so, reflect.Zero(reflect.TypeOf(so)).Interface()) {
            reflect.ValueOf(dest[i]).Elem().Set(so)
        }
    }