Let's say you have a User document, and embedded inside of it a posts document order by title:

```
embeds_many :posts, order: :title.asc
```

If you query a user's post: `User.first.posts`, the posts are returned in proper order. 

 

However, if you use an aggregation $match:

```
User.collection.aggregate([ 

{ '$match' => \{ id: 1 }

} ])
```

The posts are returned in a different order than by title. To order the posts again you have to use the aggregation pipeline:

```

{ "$unwind" => "$posts" }

, {
"$sort" =>

{ "posts.title": 1 }

},
 
```

 

Why is the aggregation pipeline not preserving the order of embedded documents??