PlayFramework completely implements an APP (3)

1. Add Post class

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 identifier, the field is a large text type, @ManyToOne identifier can only be used for each Post Corresponds to one User, and one User can correspond to multiple Posts

2. Add test cases

@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. Add Comment class

@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. Add test cases

@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 ()); rstComment);
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. Add 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. Add a method to the Post class

public Post addComment( String author, String content) {

Comment newComment = new Comment(this, author, content).save();

this.comments.add(newComment);

this.save();
return this;
}


　

7. Add test cases

@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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