$match Array in a raw MongoDB Laravel Query - php

Question

I'm working with mongodb in laravel using jenssegers driver and i have 3 documents likes this in my db
{
"_id" : ObjectId("594dd540bb7de924c0005583"),
"cliente" : "Luis",
"tipo" : "Luis",
"paquete" : "Luis",
"fecha" : null,
"fechaE" : null,
"content" : "fotos",
"precio" : NumberInt(200),
"estatus" : NumberInt(2),
"Abonos" : [
{
"Monto" : NumberInt(200),
"Fecha" : null
},
{
"Monto" : NumberInt(2000),
"Fecha" : null
},
{
"Monto" : NumberInt(2000),
"Fecha" : null
}
],
"updated_at" : ISODate("2017-06-24T02:58:08.000+0000"),
"created_at" : ISODate("2017-06-24T02:58:08.000+0000")}
Im using this Raw query to get que $sum of all "monto" for each document(3 documents).
public function updatearray(Request $request, $id){
$works = new work;
$result = Work::raw(function($collection)
{
return $collection->aggregate(array(
array('$unwind' => '$Abonos'),
array('$group' =>
array( "_id" => '$_id',"Monto" => array('$sum' => '$Abonos.Monto'))),
));
});}
I only want to display the results for my current document, is there a way i can match with the current $id?
-- Edit
Im getting id from a get method
public function abono($id){
$work = work::find($id);
return view('workabono', compact('work'));
}
and these are the routes that i use
Route::get('works/{work}/abono', [
'as' => 'works.abono', 'uses' => 'WorkController#abono']);
Route::put('works/{work}/', [
'as' => 'works.updateAbono', 'uses' => 'WorkController#updatearray']);

Answer 1

You don't even need the $unwind here. Simply $match and $project:
public function updatearray(Request $request, $id){
$works = new work;
$result = Work::raw(function($collection) use($id)
{
return $collection->aggregate(array(
array('$match' => array( '_id' => $id) ),
array('$project' =>
array( "Monto" => array('$sum' => '$Abonos.Monto') )
)
));
});}
The $sum can directly add the elements from the array.
If $id is a string you can cast to ObjectId explicitly,
$id = new \MongoDB\BSON\ObjectID($id);