El jueves, 6 de septiembre de 2018, 14:59:44 (UTC-5), davidg...@gmail.com
escribió:
>
> Am looking for insight into why the dataArray_LookupCode output array is
> partially correct.
> The newUUID() function correctly assigns to each element of the
> dataArray_LookupCode array, but the *LookupCode field values are all the
> values of the last element of the LookupCodes data source array.
> Why?
>
> package main
>
> import (
> "crypto/rand"
> "strconv"
> "fmt"
> "io"
> //"encoding/json"
> //"time"
> )
>
> func newUUID() (string, error) {
> uuid := make([]byte, 16)
> n, err := io.ReadFull(rand.Reader, uuid)
> if n != len(uuid) || err != nil {
> return "", err
> }
> // variant bits; see section 4.1.1
> uuid[8] = uuid[8]&^0xc0 | 0x80
> // version 4 (pseudo-random); see section 4.1.3
> uuid[6] = uuid[6]&^0xf0 | 0x40
> return fmt.Sprintf("%x-%x-%x-%x-%x", uuid[0:4], uuid[4:6], uuid[6:8],
> uuid[8:10], uuid[10:]), nil
> }
>
> type LookupCode struct
> {
> CodeId string `json:"codeid"`
> Description string `json:"description"`
> Active bool `json:"active"`
> }
>
> type UUID_LookupCode struct
> {
> UUID string `json:"uuid"`
> lookup *LookupCode `json:"lookup"`
> // *LookupCode [does not work]
> }
>
> var LookupCodes []LookupCode
> var dataArray_LookupCode []UUID_LookupCode
>
> func init() {
> LookupCodes = []LookupCode {
> LookupCode {
> Active: true,
> CodeId: "USA_00",
> Description: "All US States",
> },
> LookupCode {
> Active: true,
> CodeId: "USA_01",
> Description: "All US Western compact States",
> },
> }
>
> dataArray_LookupCode := make([]UUID_LookupCode, 0)
> for _, xt1 := range LookupCodes {
> c1 := &UUID_LookupCode{}
> c1.lookup = &xt1
> //c1.LookupCode.CodeId = xt1.CodeId
> typeKey, err := newUUID()
> if err == nil {
> c1.UUID = typeKey
> }
> fmt.Println(c1.lookup.CodeId ) // correct output: USA_00 USA_01
> dataArray_LookupCode = append(dataArray_LookupCode, *c1)
> }
> fmt.Printf(strconv.Itoa(len(dataArray_LookupCode))) // correct output: 2
> fmt.Println(dataArray_LookupCode[0].lookup.CodeId,dataArray_LookupCode[1].lookup.CodeId)
>
> // incorrect output: USA_01 USA_01
>
> }// init
>
> func main() {
> }
>
>
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