added timestamp to be saved to the database when a post is created

src/main/java/com/makersacademy/acebook/model/Post.java

@@ -6,6 +6,8 @@
 import lombok.Getter;
 import lombok.Setter;
 
+import java.time.LocalDateTime;
+
 @Data
 @Entity
 @Table(name = "POSTS")
@@ -29,16 +31,24 @@ public class Post {
     @Getter
     private String imageUrl;
 
-    public Post() {}
+    @Setter
+    @Getter
+    private LocalDateTime createdAt;
+
+    public Post() {
+        this.createdAt = LocalDateTime.now();
+    }
 
     public Post(String content, User user) {
         this.content = content;
         this.user = user;
+        this.createdAt = LocalDateTime.now();
     }
 
     public Post(String content, User user, String imageUrl) {
         this.content = content;
         this.user = user;
         this.imageUrl = imageUrl;
+        this.createdAt = LocalDateTime.now();
     }
 }

src/main/resources/db/migration/V8__add_created_at_colum_to_POSTS.sql

@@ -0,0 +1,2 @@
+ALTER TABLE POSTS
+ADD COLUMN created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP;

src/test/java/com/makersacademy/acebook/model/PostTest.java

@@ -7,6 +7,9 @@
 import org.junit.Before;
 import org.junit.Test;
 
+import java.time.LocalDateTime;
+import java.time.temporal.ChronoUnit;
+
 public class PostTest {
 
 	private User user;
@@ -50,4 +53,11 @@ public void postWithImageHasImageUrl() {
 	public void postWithoutImageDoesNotHaveImageUrl() {
 		assertNull(postWithoutImage.getImageUrl());
 	}
+
+	@Test
+	public void postHasCreatedAtTimestampWhenCreated() {
+		Post newPost = new Post("timestamped post", user);
+		assertNotNull(newPost.getCreatedAt());
+		assertTrue(ChronoUnit.SECONDS.between(newPost.getCreatedAt(), LocalDateTime.now()) < 1);
+	}
 }