title: MongoDB and Nodejs insert ID with auto increment
body: <p>I am new to NodeJs and MongoDB, i want to insert row with auto increment primary key 'id'. also defined a function called getNextSequence on mongo server. </p>
  
  <p>this is working perfect on Mongodb server</p>
  
  <pre><code> &gt; db.user.insert({   
       "id" : getNextSequence('user_id'), 
       "username" : "test", 
       "email" : "test@test.com", 
       "password" : "test123" 
   })
  </code></pre>
  
  <p>now i want to insert from NodeJs.I have tried this but not working </p>
  
  <pre><code>db.collection('user').insertOne({
      id : "getNextSequence('user_id')",  
      username : query.name, 
      email: query.email, 
      password: query.pass
  }, function(err, result) {
      assert.equal(err, null);
      console.log("row insterted ");
      callback();
  });
  </code></pre>