Update embedded documents in MongoDB

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I have made a collection post just as a tester which for now includes 2 documents. It has an embedded collection comments where i have entered 2 docs. A comment has a title, content and likes. I would like to know how could I add another field which is a collection named replies(Basically replies to the comments)?
Here is my insert code for the initial documents:

post=db.post<br />
post.insert<br><br />
(<br />
	[<br />
		{title:"My first Post",<br />
		content:"Hello World this is my first post 		at the website!!!",<br />
		time: new Date(),<br />
		by:{<br />
			name: "Mohit Hiralal",<br />
			email:"mh@gmail.com"}<br />
		},<br />
		{title:"My second post",<br />
		content:"This is my second post. Hope this garners some atention!",<br />
		time: new Date(),<br />
		by{<br />
name:"Mohit",email:"m@gmail.com"<br />
		},<br />
		comments:<br />
		[<br />
			{title:"Spelling wrong",<br />
			content:"You spelled attenttion wrong…",<br />
			likes:1009}<br />
		]<br />
		}<br />
]<br />
)

Posted 5-Aug-15 3:43am

Member 11887900

Updated 5-Aug-15 3:45am

v3

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Shmuel Zang · Answer 1 · 2015-08-05T18:31:00

Mainly, there are 2 approaches to achieve that goal.

You can embed the replies as a field in the post document. Something like:

JavaScript

post.insert
(
[
	// ...
	comments:
	[
	    {title:"Spelling wrong",
	    content:"You spelled attenttion wrong…",
	    likes:1009,
	    replies: []}
	]
	// ...
]
);

Or, using another collection for replies that holds the key-value of the appropriate comment (like in relational databases).

For more information you can see the MongoDB documentation about: Data Modeling.