Laravel MongoDB group by

Question

I'm currently using jenseggers-mongodb eloquent in laravel 5 with mongodb 3.0.3. I'm trying to join two different tables as follows:

User Model

public function userpayment() {
    return $this->hasMany('App\Models\Userpayment', 'user_id', '_id');
}

Userpayment model

public function user() {
    return $this->belongsTo('App\Models\User','user_id');
}

I'm using repository pattern

public function __construct() {
    $this->model = new User;
}

return $this->model->with(array('userpayment'=>function($query){
                                $query
                                ->groupBy('dealCodeNumber')
                                ->get();
                    }))
                    ->where('_id',$sid)

                    ->get();

groupBy dealCodeNumber returns NULL.

array:1 [▼
 0 => array:15 [▼
"_id" => "55813f4cbc59a3f1372e9e6f"
"full_name" => "Varathan"
"username" => "shopsyadmin"
"web_url" => ""
"userpayment" => []
]

without groupby returns all.

array:1 [▼
0 => array:15 [▼
"_id" => "55813f4cbc59a3f1372e9e6f"
"full_name" => "Varathan"
"username" => "shopsyadmin"
"userpayment" => array:2 [▼
  0 => array:57 [▼
    "_id" => "55816ce7cc7d4bac0d000029"
    "dealCodeNumber" => "1398410837"
    "inserttime" => "1398411401"
    "status" => "Pending"
  ]
  1 => array:57 [▶]
]

Querylog with groupby

[query] => shopsy_user_payment.aggregate([{"$match":{"user_id":{"$in":["55813f4cbc59a3f1372e9e6f"]}}},{"$group":{"_id":{"dealCodeNumber":"$dealCodeNumber"}

Why groupby returns null?

Answer 1

To group an column it must be selected before grouping. Changing code to below works:

return $this->model->with(array('userpayment'=>function($query){
    $query
        ->select('product_id','user_id','dealCodeNumber')
        ->groupBy('dealCodeNumber')
        ->get();
}))
    ->where('_id',$sid)
    ->get();