Iterate Over String Fields in Struct

Question

I\'m looking to iterate over the string fields of a struct so I can do some clean-up/validation (with strings.TrimSpace, strings.Trim, etc).

<

Answer 1

I don't know if it's a good way, but I use it like this.

https://play.golang.org/p/aQ_hG2BYmMD

You can send the address of a struct to this function. Sorry for My English is not very good.

trimStruct(&someStruct)

func trimStruct(v interface{}) {
    bytes, err := json.Marshal(v)
    if err != nil {
        fmt.Println("[trimStruct] Marshal Error :", err)
    }
    var mapSI map[string]interface{}
    if err := json.Unmarshal(bytes, &mapSI); err != nil {
        fmt.Println("[trimStruct] Unmarshal to byte Error :", err)
    }
    mapSI = trimMapStringInterface(mapSI).(map[string]interface{})
    bytes2, err := json.Marshal(mapSI)
    if err != nil {
        fmt.Println("[trimStruct] Marshal Error :", err)
    }
    if err := json.Unmarshal(bytes2, v); err != nil {
        fmt.Println("[trimStruct] Unmarshal to b Error :", err)
    }
}

func trimMapStringInterface(data interface{}) interface{} {
    if values, valid := data.([]interface{}); valid {
        for i := range values {
            data.([]interface{})[i] = trimMapStringInterface(values[i])
        }
    } else if values, valid := data.(map[string]interface{}); valid {
        for k, v := range values {
            data.(map[string]interface{})[k] = trimMapStringInterface(v)
        }
    } else if value, valid := data.(string); valid {
        data = strings.TrimSpace(value)
    }
    return data
}