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app/Traits/UseMongo.php

@@ -5,6 +5,8 @@
  */
 namespace App\Traits;
 
+use Illuminate\Database\Eloquent\Collection;
+
 trait UseMongo
 {
 	/**
@@ -40,4 +42,41 @@ trait UseMongo
 	{
 		$this->attributes['subject'] = utf8_encode($value);
 	}
+
+	/* METHODS */
+
+	public static function countGroupBy(string $field,array $where=[]): Collection
+	{
+		$query = collect();
+
+		if (count($where)) {
+			$where_condition = [];
+
+			foreach ($where as $key => $values) {
+				if (! is_array($values))
+					throw new \Exception('Where values must be an array.');
+
+				$where_condition[$key] = ['$in' => $values];
+			}
+
+			$query->push([
+				'$match' => $where_condition
+			]);
+		}
+
+		$query->push([
+			'$group' => [
+				'_id' => [$field=>'$'.$field],
+				'count' => ['$sum' => 1]
+			]
+		]);
+
+		return (new self)
+			->groupBy($field)
+			->raw(function($collection) use ($query) {
+				return $collection->aggregate(
+					$query->toArray()
+				);
+			});
+	}
 }