how to post data to model in loopback

[Bipin Shukla]

hello guys i m new to loopback, don't know to post data to model eg:

here is my login.ejs file

    <form action="/login" method="post">

   <input type="text" name="username" placeholder="username">

   <input type="password" name="password" placeholder="password">

   <input type="submit" name="" value="Submit">

    </form>

now when user click on login how i can submit send it to model through router of directly call model root.js

       app.post('/login', login.index);

how i can call login model from root.js or directly access login model js