Laravel - mongodb insertMany（嵌入关系）不提交

I want to insert a array to object as embed in collection mongodb like this and below image :

[ 
  [
        "lat"=> 59.56555555455,
        "lon"=> 35.54598994564,
        "type"=> "manual"
  ],...
 ]

To achieve it I wrote below code. When I use foreache it did work but when I want to use InsertMany with raw query log it shows me objects inserted but when I check the database no change are committed!!! Where is my mistake?

log:

InsertManyResult {#302
-writeResult: WriteResult {#301}
-insertedIds: array:3 [
0 => ObjectId {#297
  +"oid": "5bcd6d636925022398005981"
}
1 => ObjectId {#281
  +"oid": "5bcd6d636925022398005982"
}
2 => ObjectId {#298
  +"oid": "5bcd6d636925022398005983"
}
 ]
 -isAcknowledged: true
}```

code:

    $userTraffic = Auth::user()->userTraffic()->firstOrFail();

    if ($userTraffic) {

     $userTraffic->traffics()->raw( function ( $collection ) use ($traffic) {

            $data= $collection->insertMany($traffic);
            dd($data);
            return $data;
        });

        /*  foreach ($traffic as $field) {
              $userTraffic->traffics()->create($field);
          }*/

        return response(['status'=>true,'UserID:'=> Auth::id(),'data'=>$traffic,'insert'=>$userTraffic], 200);
    }
    else return response(['status'=>false,'message'=>'traffic\'s user not found'], 404);



}

--answer:

just use $userTraffic->traffics()->createMany($traffic); with no problem :) ;