mongoose response odd format - mongodb

Question

What I'm trying to do is let the user get a list of posts that they have added to their favorites which is done by simply putting their _id into the post's favorites array.
when running that particular query, it comes back as an array with unnamed entries along with _locals in the array.
I need something more like Posts: [ {}, {} ], _locals.
How do I get it into that format?
var UserSchema = new Schema({
username : String,
firstName : String,
lastName : String,
email : String,
password : String
});
var PostSchema = new Schema({
author : { type: Schema.Types.ObjectId, ref: 'User' },
date : Date,
body : String,
username : String,
sid : String,
views : Number,
likes : [{ type: Schema.Types.ObjectId, ref: 'User' }],
favorites : [{ type: Schema.Types.ObjectId, ref: 'User' }]
});
and the get
app.get('/favorites', function(req, res) {
Post
.find({ 'favorites': '58f4f9e5650785228016287f'})
.exec(function(err, favorites) {
res.render('favorites', favorites)
console.log(favorites)
})
});
I get a response of
[ { _id: 58f4f9e96507852280162880,
author: 58f4f9e5650785228016287f,
body: 'test',
date: 2017-04-17T17:22:49.059Z,
username: 'test',
sid: 'BJ-xquGRl',
__v: 2,
favorites: [ 58f4f9e5650785228016287f ],
likes: [] },
{ _id: 58f500edd8abc7242c90d61c,
author: 58f4f9e5650785228016287f,
body: 'w00p w00p',
date: 2017-04-17T17:52:45.612Z,
username: 'test',
sid: 'BJ8g-tG0e',
__v: 1,
favorites: [ 58f4f9e5650785228016287f ],
likes: [] },
_locals: { user:
{ id: 58f4f9e5650785228016287f,
username: 'test',
firstName: 'test',
lastName: 'test',
email: 'test#test.com' } } ]

Answer 1

That _locals is something that Express adds to the object that you pass to res.render(). If you would reverse the function calls you made, it wouldn't be there anymore:
console.log(favorites);
res.render('favorites', favorites);
However, the main issue is that you're passing an array (favorites) as argument to res.render(), which expects an object instead. The correct way of calling it would be by passing favorites as an object value:
res.render('favorites', { favorites : favorites });
// Or in recent Node versions:
// res.render('favorites', { favorites });