How to use groupBy Month and Sum in laravel MongoDB - laravel

Question

Query to get monthly orders (total orders per month(count) or total sales per month(sum)):
Tried this query, but it is not working. Also tried with other results from StackOverflow, but I didn't understand how it is done with MongoDB query. This is the link to that question : select-sum-column-and-group-by-with-mongodb-and-laravel
$monthly_orders = Order::select(
DB::raw('sum(total_amount) as sum'),
DB::raw('YEAR(created_at) year, MONTH(created_at) month'),
)
->groupBy('month')
->get();
When I try to get total amount by using group by customer ID , it is returning sum as null
$monthly_orders = Order::selectRaw('sum(total_amount) as sum, customer_id')
->groupBy('customer_id')
->pluck('sum', 'customer_id');
Result :
Illuminate\Support\Collection {#2123 ▼
#items: array:4 [▼
"6098e5ff5977a25ee96a2a42" => null
"60dbf87f7d8ffb7cdb2233d2" => null
"605af409195d8e59e34893f2" => null
"60ddae4a66fb69678e45f056" => null
]
}

Answer 1

Try using raw and aggregate
$monthly_orders = Order::raw(function ($collection) {
return $collection->aggregate([
[
'$group' => [
"_id" => '$customer_id',
'customer_id' => ['$first' => '$customer_id'],
'sum' => ['$sum' => '$total_amount']
]
],
]);
});
you can use pluck
$monthly_orders->pluck('sum','customer_id')
Group by month
$monthly_orders = Order::raw(function ($collection) {
return $collection->aggregate([
[
'$group' => [
"_id" => ['$month'=>'$created_at'],
'customer_id' => ['$first' => '$customer_id'],
'sum' => ['$sum' => '$total_amount']
]
],
]);
});