fork download
copy 
  1. package main
  2.  
  3. import (
  4. 	"encoding/json"
  5. 	"fmt"
  6. 	"log"
  7. 	"reflect"
  8. 	"strconv"
  9. 	"strings" // Fixed: Added missing import
  10. )
  11.  
  12. type Person struct {
  13. 	Name string `json:"name"`
  14. 	Age  int    `json:"age"`
  15. 	City string `json:"city"`
  16. }
  17.  
  18. func mapDataToStruct(data map[string]interface{}, target interface{}) {
  19. 	v := reflect.ValueOf(target).Elem()
  20. 	for key, val := range data {
  21. 		// Find the field case-insensitively
  22. 		field := v.FieldByNameFunc(func(s string) bool { return strings.ToLower(s) == key })
  23. 		if !field.IsValid() {
  24. 			log.Printf("Invalid key in data: %s\n", key)
  25. 			continue
  26. 		}
  27. 		if field.CanSet() {
  28. 			switch val.(type) {
  29. 			case string:
  30. 				if field.Kind() == reflect.Int {
  31. 					intVal, err := strconv.Atoi(val.(string))
  32. 					if err != nil {
  33. 						log.Printf("Error converting to int for field '%s': %v\n", key, err)
  34. 						continue
  35. 					}
  36. 					field.SetInt(int64(intVal))
  37. 				} else {
  38. 					field.SetString(val.(string))
  39. 				}
  40. 			case int:
  41. 				if field.Kind() == reflect.Int {
  42. 					field.SetInt(int64(val.(int)))
  43. 				}
  44. 			default:
  45. 				log.Printf("Unsupported type for field '%s': %T\n", key, val)
  46. 			}
  47. 		} else {
  48. 			log.Printf("Field '%s' is not settable\n", key)
  49. 		}
  50. 	}
  51. }
  52.  
  53. func main() {
  54. 	inputData := map[string]interface{}{
  55. 		"name":   "John Doe",
  56. 		"age":    30,
  57. 		"city":   "New York",
  58. 		"gender": "male", // Unsupported field
  59. 	}
  60.  
  61. 	var person Person
  62. 	if err := json.Unmarshal([]byte(`{"name":"Alice"}`), &person); err != nil {
  63. 		panic(err)
  64. 	}
  65. 	fmt.Println("Original Person:", person)
  66.  
  67. 	mapDataToStruct(inputData, &person)
  68.  
  69. 	fmt.Println("\nPerson after mapping:", person)
  70. }
  71.  
Success #stdin #stdout #stderr 0s 5272KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Original Person: {Alice 0 }

Person after mapping: {John Doe 30 New York}
stderr
copy 
2024/12/17 06:21:19 Invalid key in data: gender
https://ideone.com/qdClFL
422792_turn1_modelA_fixed
language:
Go (go 1.12.1)
created:
5 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!