How to convert mongoDB query into PHP? - php

Question

My query is working in mongodb and produce output Properly. But same query i tried to run using php then it gives following error
Array
(
[ok] => 0
[errmsg] => A pipeline stage specification object must contain exactly one field.
[code] => 16435
)
Following is my MongoDB Query
db.sample_coll.aggregate(
{
$unwind: {
path:"$KeyValues",
includeArrayIndex:"arrayIndex",
preserveNullAndEmptyArrays:true
}
},
{
$project: {
timestamp:{
"$add":["$EventTS",{"$multiply":[60000,"$arrayIndex"]}]
} ,
"InputVolt":"$KeyValues.InputVolt",
arrayIndex:1
}
},
{
$match: {
$and: [
{InputVolt: {$ne: null}}
]
}
}
);
The Above query is converted in php
$pipeline = array(
array('$unwind' =>
array( 'path' => '$KeyValues'),
array( 'includeArrayIndex' => 'arrayIndex' ),
array( 'preserveNullAndEmptyArrays' => 'true' )
),
array(
'$project' => array(
'timestamp' => array(
'$add' => array(
'$EventTS',
array('$multiply' => array( 60000, '$arrayIndex' ))
)
),
array( 'InputVolt' => array( '$KeyValues', 'InputVolt' ) ) ,
array('arrayIndex' => 1)
)
),
array(
'$match' => array(
'$and' => array(
array('InputVolt' => array('$ne' => null )),
)
)
)
);
$result = $collection->aggregate($pipeline);
Kindly help to resolve this issue.
Thanks in advance

Answer 1

Your pipeline in PHP:
$pipeline = array(
array('$unwind' => array(
'path' => '$KeyValues',
'includeArrayIndex' => 'arrayIndex',
'preserveNullAndEmptyArrays' => true
)),
array('$project' => array(
'timestamp' => array(
'$add' => array('$EventTS', array('$multiply' => array(60000, '$arrayIndex')))
),
'InputVolt' => '$KeyValues.InputVolt',
'arrayIndex' => 1
)),
array('$match' => array(
'InputVolt' => array('$ne' => null)
))
);