How to Insert with in nested schema using node.js?

I have a schema like:

var SchComments = new Schema({
    title     : String
  , body      : String
  , date      : Date
});


var BlogPost = new Schema({
    author    : ObjectId
  , title     : String
  , body      : String
  , date      : Date
  , comments  : [SchComments ]
  , meta      : {
        votes : Number
      , favs  : Number
    }
});

How can I insert value to nested schema. How can I call SchComments to pass value in Node.JS

To add an element to a post's comments array, you can either call push on the array and then save the change:

var post = new BlogPostModel({});
post.comments.push({title: 'a', body: 'b', date: new Date()});
post.save(callback);

Or use a $push operator in an update:

BlogPostModel.update({}, {$push: {comments: {
    title: 'a2', body: 'b2', date: new Date()
}}}, callback);

There are other ways, but those are the most typical.