- Добавил поле автор в сообщение.

https://www.youtube.com/watch?v=PpoOoR55Ypw&list=PLU2ftbIeotGpAYRP9Iv2KLIwK36-o_qYk&index=6

src/main/java/net/sytes/kashey/sweater/controller/MainController.java

@@ -1,7 +1,12 @@
 package net.sytes.kashey.sweater.controller;
 
 import net.sytes.kashey.sweater.domain.Message;
+import net.sytes.kashey.sweater.domain.User;
 import net.sytes.kashey.sweater.repository.MessageRepository;
+import net.sytes.kashey.sweater.repository.UserRepository;
+import net.sytes.kashey.sweater.security.CustomUserDetails;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -13,9 +18,11 @@ import java.util.Map;
 public class MainController {
 
     private final MessageRepository messageRepository;
+    private final UserRepository userRepository;
 
-    public MainController(MessageRepository messageRepository) {
+    public MainController(MessageRepository messageRepository, UserRepository userRepository) {
         this.messageRepository = messageRepository;
+        this.userRepository = userRepository;
     }
 
     @GetMapping("/")
@@ -31,9 +38,15 @@ public class MainController {
     }
 
     @PostMapping("/main")
-    public String addMessage(@RequestParam String text, @RequestParam String tag, Map<String, Object> model) {
+    public String addMessage(@AuthenticationPrincipal CustomUserDetails details,
+                             @RequestParam String text,
+                             @RequestParam String tag,
+                             Map<String, Object> model) {
 
-        messageRepository.save(new Message(text, tag));
+        User author = userRepository.findByUsername(details.getUsername())
+                .orElseThrow(() -> new UsernameNotFoundException("User not found: " + details.getUsername()));
+
+        messageRepository.save(new Message(text, tag, author));
         model.put("messages", messageRepository.findAll());
         return "main";
     }

src/main/java/net/sytes/kashey/sweater/domain/Message.java

@@ -1,9 +1,6 @@
 package net.sytes.kashey.sweater.domain;
 
-import jakarta.persistence.Entity;
-import jakarta.persistence.GeneratedValue;
-import jakarta.persistence.GenerationType;
-import jakarta.persistence.Id;
+import jakarta.persistence.*;
 
 @Entity
 public class Message {
@@ -13,6 +10,10 @@ public class Message {
     private String text;
     private String tag;
 
+    @ManyToOne(fetch = FetchType.EAGER)
+    @JoinColumn(name = "user_id")
+    private User author;
+
     public Message() {
     }
 
@@ -21,6 +22,12 @@ public class Message {
         this.tag = tag;
     }
 
+    public Message(String text, String tag, User author) {
+        this.text = text;
+        this.tag = tag;
+        this.author = author;
+    }
+
     public Integer getId() {
         return id;
     }
@@ -44,4 +51,16 @@ public class Message {
     public void setTag(String tag) {
         this.tag = tag;
     }
+
+    public User getAuthor() {
+        return  author;
+    }
+
+    public void setAuthor(User author) {
+        this.author = author;
+    }
+
+    public String getAuthorName() {
+        return author == null ? "<none>": author.getUsername();
+    }
 }

src/main/resources/templates/main.mustache

@@ -32,6 +32,7 @@
         <b>{{id}}</b>
         <span>{{text}}</span>
         <i>{{tag}}</i>
+        <strong>{{authorName}}</strong>
     </div>
     {{/messages}}
 </body>