learning_cloud_native_go.12.app.app.bookHandler.go

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
  }
  
  // ...
	
}

func (app *App) HandleUpdateBook(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
  }
	
  // ...
	
}