PlayFramework完整实现一个APP（三）

 1.添加Post类

package models;

import java.util.*;
import javax.persistence.*;
import play.db.jpa.*;

@Entity
@Table(name = "blog_post")
public class Post extends Model {
public String title;
public Date postedAt;

@Lob
public String content;

@ManyToOne
public User author;

public Post(User author, String title, String content) {
this.author = author;
this.title = title;
this.content = title;
}
}

@Lob 标识，字段是一个large text的类型，@ManyToOne 标识每个Post只能对应一个User，一个User可以对应多个Post

2. 添加测试用例

       @Test
public void createPost() {
// Create a new user and save it
User user = new User("bob@Gmail.com", "####", "Bob").save();

// Create a new post
new Post(user, "My first post", "Hello world").save();

// Test that the post has been created
assertEquals(1, Post.count());

// Retrieve all posts created by user
List posts = Post.find("byAuthor", user).fetch();

// Tests
assertEquals(1, posts.size());
Post firstPost = posts.get(0);
assertNotNull(firstPost);
assertEquals(user, firstPost.author);
assertEquals("My first post", firstPost.title);
assertEquals("Hello world", firstPost.content);
assertNotNull(firstPost.postedAt);
}    

3.添加Comment类

@Entity
public class Comment extends Model {
public String author;
public Date postedAt;

@Lob
public String content;

@ManyToOne
public Post post;

public Comment(Post post, String author, String content) {
this.post = post;
this.author = author;
this.content = content;
this.postedAt = new Date();
}
}

4.添加测试用例

@Test
public void postComments() {
   // Create a new user and save it
   User bob = new User("bob@gmail.com", "secret", "Bob").save();

   // Create a new post
   Post bobPost = new Post(bob, "My first post", "Hello world").save();

   // Post a first comment
   new Comment(bobPost, "Jeff", "Nice post").save();
   new Comment(bobPost, "Tom", "I knew that !").save();

   // Retrieve all comments
   List bobPostComments = Comment.find("byPost", bobPost).fetch();

   // Tests
   assertEquals(2, bobPostComments.size());

   Comment firstComment = bobPostComments.get(0);
   assertNotNull(firstComment);
   assertEquals("Jeff", firstComment.author);
   assertEquals("Nice post", firstComment.content);
   assertNotNull(firstComment.postedAt);

   Comment secondComment = bobPostComments.get(1);
   assertNotNull(secondComment);
   assertEquals("Tom", secondComment.author);
   assertEquals("I knew that !", secondComment.content);
   assertNotNull(secondComment.postedAt);
}

5.在Post类中添加Comment

@OneToMany(mappedBy="post", cascade=CascadeType.ALL)
public List comments;

public Post(User author, String title, String content) {
this.comments = new ArrayList();
this.author = author;
this.title = title;
this.content = title;
this.postedAt = new Date();
}

6.在Post类中添加方法

public Post addComment(String author, String content) {
   Comment newComment = new Comment(this, author, content).save();
   this.comments.add(newComment);
   this.save();
   return this;
}

7.添加测试用例

@Test
public void useTheCommentsRelation() {
   // Create a new user and save it
   User bob = new User("bob@gmail.com", "secret", "Bob").save();

   // Create a new post
   Post bobPost = new Post(bob, "My first post", "Hello world").save();

   // Post a first comment
   bobPost.addComment("Jeff", "Nice post");
   bobPost.addComment("Tom", "I knew that !");

   // Count things
   assertEquals(1, User.count());
   assertEquals(1, Post.count());
   assertEquals(2, Comment.count());

   // Retrieve Bob's post
   bobPost = Post.find("byAuthor", bob).first();
   assertNotNull(bobPost);

   // Navigate to comments
   assertEquals(2, bobPost.comments.size());
   assertEquals("Jeff", bobPost.comments.get(0).author);
   
   // Delete the post
   bobPost.delete();
   
   // Check that all comments have been deleted
   assertEquals(1, User.count());
   assertEquals(0, Post.count());
   assertEquals(0, Comment.count());
}

运行Test，如有异常会出现下方提示

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