Rearrrange populated json result in mongoose - mongodb

Question

A simple json response for Post.find().populate("name") will return json result as follow. Note: The focus of the question is to rearrange the "name":"Alex" in json to the final structure as shown. Ignore the part that need hiding _id and __v. Thanks.
[
{
"_id": "54cd6669d3e0fb1b302e54e6",
"title": "Hello World",
"postedBy": {
"_id": "54cd6669d3e0fb1b302e54e4",
"name": "Alex",
"__v": 0
},
"__v": 0
},
...
]
How could i rearrange and display the entire json as follow?
[
{
"_id": "54cd6669d3e0fb1b302e54e6",
"title": "Hello World",
"name": "Alex"
},
...
]

Answer 1

You can use the lean() method to return a pure JSON object (not a mongoose document) that you can then manipulate using lodash helper methods such as map(), like in the following example:
Post.find()
.populate("name")
.lean().exec(function (err, result) {
if(result){
var posts = _.map(result, function(p) {
p.name = p.postedBy.name;
p.postedBy = undefined;
return p;
});
console.log(posts);
}
});
You can disable the "__v" attribute in your Schema definitions by setting the versionKey option to false. For example:
var postSchema = new Schema({ ... attributes ... }, { versionKey: false });
As follow-up to your question on rearranging the order of the properties in the JSON, JS does not define the order of the properties of an object. However, you
can use both the JSON.parse() and JSON.stringify() methods to change the order, for example
var json = {
"name": "Alex",
"title": "Hello World",
"_id": "54cd6669d3e0fb1b302e54e6"
};
console.log(json);
//change order to _id, title, name
var changed = JSON.parse(JSON.stringify(json, ["_id","title","name"] , 4));
console.log(k);
Check the demo below.
var json = {
"name": "Alex",
"title": "Hello World",
"_id": "54cd6669d3e0fb1b302e54e6"
};
//change order to _id, title, name
var changed = JSON.parse(JSON.stringify(json, ["_id","title","name"] , 4));
pre.innerHTML = "original: " + JSON.stringify(json, null, 4) + "</br>Ordered: " + JSON.stringify(changed, null, 4);
<pre id="pre"></pre>