Laravel 5 Eloquent sum of multiplied columns for mongo DB

Question

This is my invoices mongo table 

{
    \'_id\': ObjectId(\"565d78336fe444611a8b4593\"),
    \'TransactionID\': \'X020\',
    \'Type\': \'SALESINVOICE\',
    \'Invoi         


        

Answer 1

I believe aggregation operators like sum expect exact column name as a parameter. You can try to project the multiplication first, then sum the result:

DB::connection($this->MongoSchemaName)
    ->collection($this->InvoicesTable)
    ->where('ContactID', (int)$customer->ContactID)
    ->project([
        'ContactID' => 1, 
        'TotalInBaseCurrency' => ['$multiply' => ['$Total', '$CurrencyRate']]
    ])
    ->sum('TotalInBaseCurrency')

or use aggregation directly:

DB::connection($this->MongoSchemaName)
    ->collection($this->InvoicesTable)
    ->raw(function($collection) use ($customer){
        return $collection->aggregate([
            ['$match' => [
                    'ContactID' => (int)$customer->ContactID,
                    'Type' => 'PAYMENT'
                ]
            ],
            ['$group' => [
                '_id' => '$ContactID',
                'TotalInBaseCurrency' => [
                        '$sum' => ['$multiply' => ['$Total', '$CurrencyRate']]
                    ]
                ]
            ]
        ]);
    })