M101J: MongoDB for Java Developers Homework 3.2

Step 1:
Download Handout

Step 2:
Problem:
we need to enhance the project and we should be able to insert the entries in post collection. changes that we need to made are marked as XXX in BlogPostDAO
.

Solution:

open BlogPostDAO.java

1) Go to findByPermalink method

add below line at XXX

post = postsCollection.findOne(new BasicDBObject("permalink", permalink));

 2) Go to findByDateDescending method

add below line at XXX

DBCursor cursor = postsCollection.find()
 .sort(new BasicDBObject().append("date", -1)).limit(limit); 

    //DBCursor cursor1 = postsCollection.find();
        posts = new LinkedList<DBObject>();
        for (DBObject value : cursor) {
            posts.add(value);
        }
        System.out.println("Value from the DB" + posts);

3) Go to addPost method

add below Line at XXX

Date now = new Date();
  List comments = new ArrayList<Object>();
  post.append("author", username).append("title", title)
    .append("body", body).append("permalink", permalink)
    .append("tags", tags).append("date", now)
    .append("comments", comments);
  postsCollection.insert(post);

4) Go to addPostComment method

add below Line at XXX
  BasicDBObject comment = new BasicDBObject().append("author", name)
    .append("body", body);
  if (email != null) {
   comment.append("email", email);
  }
  postsCollection.update(new BasicDBObject("permalink", permalink),
    new BasicDBObject("$push", new BasicDBObject("comments",
      comment)), true, false);

you require only above changes.

now re compile using mvn compile exec:java -Dexec.mainClass=course.BlogController

or run the run.sh file

login to http://localhost:8082/login

you should be able to insert post in the blog.

MongoProc 

1) now go to mongoproc and login with course ID 

2)go to your homework and Click on Test.

3)if you receive below feedback then everything is correct. you should click on turn in

and you score will be submitted. 

Feedback Welcome. enjoy you homework.