title: How to append form fields using angular and how to insert value in DB
body: <p>I am using express and mongoose to save data in mongodb.
  I am creating Node API, Below is my Mongo Schema.</p>
  
  <pre><code>var bookSchema=new Schema({ 
      subject_name:{type:String}, 
      books:[{book_name:String, book_author:String}] 
  }); 
  </code></pre>
  
  <p>My html view is as below </p>
  
  <p><a href="https://i.stack.imgur.com/yQWFr.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/yQWFr.jpg" alt="enter image description here"></a></p>
  
  <p>I want to append books more than one in respect to a single subject name. So I want to know that How can I append Books section more than once using Angularjs and how to store its value in mongodb.</p>
  
  <p>and I expect the result something like that:</p>
  
  <p><a href="https://i.stack.imgur.com/hPNLv.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hPNLv.jpg" alt="enter image description here"></a></p>
  
  <p>Please Let me how can I do that.</p>
  
  <p>Thanks in Advance.</p>