How to use properly nested mongoose model and schema - node.js

Question

This is my schema. I am new to mongoose but trying the policy why to send extra info when not required. I have tried to do a subDocument for comments and likes.
var post = new Schema({
postid: {type: Number, required: true, unique: true},
title: {type: String, required: [true, 'Title cannot be blank']},
startdate: {type: Date, required: true, default: Date.now},
enddate: {type: Date, required: true, default: new Date(+new Date() + 15 * 24 * 60 * 60 * 1000)},
comments: [
{
id: {type: Number, required: true},
message: {type: String, required: true},
userid: {type: String, required: true, unique: true},
updated_at: {type: Date, required: true, default: Date.now, select: false},
likes: [
{
userid: {type: String, required: true, unique: true},
updated_at: {type: Date, required: true, default: Date.now},
}
],
}
],
}, {
timestamps: {
createdAt: 'created_at',
updatedAt: 'updated_at'
}
});
post.index({postid: 1});
I am doing some dirty tricks to get the data in rest api by using lean().
// post [GET]
[
{ postid: 1, title: "dfdsfadsf", startdate: "dafdsfadsf", enddate: "dsafdsfads", commentscount: 6},
{ postid: 2, title: "ffdsfadsf", startdate: "dafdsfadsf", enddate: "dsafdsfads", commentscount: 5},
]
// post/:id [GET]
{
postid: 1,
title: "dfdsfadsf",
startdate: "dafdsfadsf",
enddate: "dsafdsfads",
comments: [{
{id: 1, message: "ddsfsfadsfa", likescount: 6},
{id: 2, message: "dsfafdrsdsfa", likescount: 3},
{id: 3, message: "dsfaefdsdsfa", likescount: 4},
{id: 4, message: "dfsfdsfadsfa", likescount: 5},
{id: 5, message: "fdsfdsfadsfa", likescount: 7},
{id: 6, message: "dsfadwsfadsf", likescount: 0}
}]
}
// post/:id/comments/:commentid/likes [GET]
{
id: "1",
message: "fadsfads",
likes: [
{ userid: 1, updated_at: "some date" },
{ userid: 2, updated_at: "some date" },
{ userid: 3, updated_at: "some date" },
{ userid: 4, updated_at: "some date" },
{ userid: 5, updated_at: "some date" },
{ userid: 6, updated_at: "some date" }
]
}
Using mysql it was pretty easy to use an ORM and do all these with one single query. Now in mongoose I am doing this in a bad way, like
for the first route, I am doing
Posts.find({}).select({
postid: true,
title: true,
startdate: true,
enddate: true,
comments: true
}).lean().exec(function(err, doc){
if (doc) {
if(doc.comments.length > 0) {
doc.commentcount = doc.comments.length;
delete doc.comments;
}
}
});
Same way I am doing for other two routes. I feel there might be a proper way to do all these using mongoose model. I have tried using aggregate & populate. But not my piece of cake.
If anyone can guide how to use the ORM and fetch data properly for one, I'll be glad and can do the rest.

Answer 1

You can only add likescount: {type: Number} in comments field and increment this field when .push new object to likes field.