MEAN Mongodb replace collection and create documents - angularjs

Question

So i have a schema like that:
var article = new mongoose.Schema({
title : String,
comments : [{
pe: mongoose.Schema.Types.ObjectId,
ref: 'Comment'
}]
});
and:
var comment = new mongoose.Schema({
created : Date,
text : String
});
now i have my small angular application, when i retrieve with my API and article i get something like:
{
title : "please help me"
comments : []
}
now on the front end I push some comments and the new object is:
{
title : "please help me"
comments : [{
text : "Now, go f**k yourself",
date : "1 January 1970 00:00:00 UTC."
}]
}
when i call the API and I update the document, I would like that mongo would Create the sub-object comments by himself, is there a way ?
Should it do it automatically ?

Answer 1

I would write a article schema this way (disclaimer: I haven't tried mongoose):
var article = new mongoose.Schema({
_id: String // or mongodb.ObjectId? I'm not sure.
title : String,
comments : [{
_id: String // this field is not nessesary
text: String,
date: String
}]
});
var comment = new mongoose.Schema({
created : Date, // created or date?
text : String
});
When you retrieve with you api, you'll get something like:
{
"_id": "ndrjgnd..fesf",
"title": "grdgrdgr",
comments: [ {"text": "hello", "created": "2016:...:"}, ... , ]
}
Then you can push new comments from front end:
{
"articleId": "ndrjgnd..fesf", // this is important.
"text": "balabala"
}
And update db: db.article.update( {_id: ariticleId}, {$push: newComment})