how to aggregate mongodb collection data in laravel - php

Question

i have collection like this
{
"wl_total" : 380,
"player_id" : 1241,
"username" : "Robin",
"hand_id" : 292656,
"time" : 1429871584
}
{
"wl_total" : -400,
"player_id" : 1243,
"username" : "a",
"hand_id" : 292656,
"time" : 1429871584
}
as both collection have same hand_id i want to aggregate both these collection on the basis of hand_id
i want result as combine of
data=array(
'hand_id'=>292656,
'wl_total'=>
{
0=>380,
1=>-400
},
'username'=>
{
0=>"Robin",
1=>"a"
},
"time"=>1429871584
)

Answer 1

You basically want a $group by the "hand_id" common to all players, and then $push to different arrays in the document and then also do something with "time", I took $max. Nees to be an accumulator of some sort at any rate.
Also not sure what your underlying collection name is, but you can call this in laravel with a construct like this:
$result = DB::collection('collection_name')->raw(function($collection)
{
return $collection->aggregate(array(
array(
'$group' => array(
'_id' => '$hand_id',
'wl_total' => array(
'$push' => '$wl_total'
),
'username' => array(
'$push' => '$username'
),
'time' => array(
'$max' => '$time'
)
)
)
));
});
Which returns output ( shown in json ) like this:
{
"_id" : 292656,
"wl_total" : [
380,
-400
],
"username" : [
"Robin",
"a"
],
"time" : 1429871584
}
Personally I would have gone for a single array with all the infomation in it for the grouped "hand", but I supose you have your reasons why you want it this way.