dumindu

import "myapp/util/validator"

func (app *App) HandleCreateBook(w http.ResponseWriter, r *http.Request) {

  	// after create form from decoding request Body
  
  	if err := app.validator.Struct(form); err != nil {
		app.logger.Warn().Err(err).Msg("")

		resp := validator.ToErrResponse(err)

dumindu

package validator

import (
	"fmt"
	"reflect"
	"strings"

	"gopkg.in/go-playground/validator.v9"
)

dumindu

func (app *App) HandleCreateBook(w http.ResponseWriter, r *http.Request) {

  // after create form from decoding request Body
  
  if err := app.validator.Struct(form); err != nil {
	app.logger.Warn().Err(err).Msg("")

	w.WriteHeader(http.StatusUnprocessableEntity)
	fmt.Fprintf(w, `{"error": "%v"}`, err.Error())
	return

dumindu

type BookForm struct {
	Title         string `json:"title" form:"required,max=255"`
	Author        string `json:"author" form:"required,max=255"`
	PublishedDate string `json:"published_date" form:"required"`
	ImageUrl      string `json:"image_url" form:"url"`
	Description   string `json:"description"`
}

dumindu

import "gopkg.in/go-playground/validator.v9"

type App struct {
	logger    *logger.Logger
	db        *gorm.DB
	validator *validator.Validate
}

func New(
	logger *logger.Logger,

dumindu

import vr "myapp/util/validator"

func main() {
  // ...

	validator := vr.New()

	application := app.New(logger, db, validator)
  
  // ...

dumindu

package validator

import (
	"gopkg.in/go-playground/validator.v9"
)

func New() *validator.Validate {
	validate := validator.New()
	validate.SetTagName("form")

dumindu

func (app *App) HandleUpdateBook(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.ParseUint(chi.URLParam(r, "id"), 0, 64)
	if err != nil || id == 0 {
		app.logger.Info().Msgf("can not parse ID: %v", id)

		w.WriteHeader(http.StatusUnprocessableEntity)
		return
	}

	form := &model.BookForm{}

dumindu

func UpdateBook(db *gorm.DB, book *model.Book) error {
	if err := db.First(&model.Book{}, book.ID).Update(book).Error; err != nil {
		return err
	}

	return nil
}

dumindu

const (
	appErrDataCreationFailure = "data creation failure"
	appErrFormDecodingFailure = "form decoding failure"
)