Creating validator.go allowing us to validate received data from our endpoints. Updating errors.go adding failedValidationResponse method allowing us to deliver a StatusUnprocessableEntity error. Updating createMovieHandler with the use of our new validator package.

cmd/api/errors.go

@@ -51,3 +51,8 @@ func (app *application) methodNotAllowedResponse(w http.ResponseWriter, r *http.
 func (app *application) badRequestResponse(w http.ResponseWriter, r *http.Request, err error) {
 	app.errorResponse(w, r, http.StatusBadRequest, err.Error())
 }
+
+// The errors parameter here has the type map[string]string, which is exactly the same as the errors map contained in our Validator type.
+func (app *application) failedValidationResponse(w http.ResponseWriter, r *http.Request, errors map[string]string) {
+	app.errorResponse(w, r, http.StatusUnprocessableEntity, errors)
+}