Updating controller and model to handle errors

gildedgardenia · gildedgardenia · commit 93fe19dbc91c · 2023-07-28T12:26:12.000-05:00
diff --git a/src/main/java/org/launchcode/codingevents/controllers/EventController.java b/src/main/java/org/launchcode/codingevents/controllers/EventController.java
@@ -1,10 +1,12 @@
 package org.launchcode.codingevents.controllers;
 
+import jakarta.validation.Valid;
 import org.launchcode.codingevents.data.EventData;
 import org.launchcode.codingevents.models.Event;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.ui.Model;
+import org.springframework.validation.Errors;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -26,11 +28,19 @@ public String displayAllEvents(Model model) {
     @GetMapping("create")
     public String displayCreateEventForm(Model model) {
         model.addAttribute("title", "Create Event");
+        model.addAttribute(new Event());
         return "events/create";
     }
 
     @PostMapping("create")
-    public String processCreateEventForm(@ModelAttribute Event newEvent) {
+    public String processCreateEventForm(@ModelAttribute @Valid Event newEvent,
+                                         Errors errors, Model model) {
+        if(errors.hasErrors()) {
+            model.addAttribute("title", "Create Event");
+            model.addAttribute("errorMsg", "Bad data!");
+            return "events/create";
+        }
+
         EventData.add(newEvent);
         return "redirect:/events";
     }
diff --git a/src/main/java/org/launchcode/codingevents/models/Event.java b/src/main/java/org/launchcode/codingevents/models/Event.java
@@ -14,13 +14,14 @@ public class Event {
     private int id;
     private static int nextId = 1;
 
-    @NotBlank
+    @NotBlank(message = "Name is required")
     @Size(min = 3, max = 50, message = "Name must be between 3 and 50 characters")
     private String name;
 
     @Size(max = 500, message = "Description too long!")
     private String description;
 
+    @NotBlank(message = "Email is required")
     @Email(message = "Invalid email. Try again.")
     private String contactEmail;
 
@@ -32,6 +33,7 @@ public Event(String name, String description, String contactEmail) {
         nextId++;
     }
 
+    public Event() {}
     public String getName() {
         return name;
     }
diff --git a/src/main/resources/templates/events/create.html b/src/main/resources/templates/events/create.html
@@ -5,6 +5,8 @@
 
 <header th:replace="fragments :: header"></header>
 
+<p th:text="${errorMsg}" style="color:red;"></p>
+
 <form method="post">
     <div class="form-group">
         <label>Name
