Struct to Map by Tag

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@winampmaker

https://play.golang.org/p/RObzlfjZSRi

func struct2Map(model interface{}, tagName string) map[string]interface{} {
 m := make(map[string]interface{})
 r := reflect.ValueOf(model)
 total := r.NumField()
 for i := 0; i < total; i++ {
         m[r.Type().Field(i).Tag.Get(tagName)] = r.Field(i).Interface()
 }
 return m
}

============================

"github.com/fatih/structs"

func StructtoMapbyTag(tr interface{}, tag string) map[string]interface{} {
  t := make(map[string]interface{}) //儲存處理過的m 
  s := structs.New(tr)
  m := s.Map() //先轉成map[string]interface{}
  for key, value := range m {
    t[s.Field(key).Tag(tag)] = value.(string)
  }
  return t
}