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Labdien, Vēlējos apjautāties kā pareizi jāveido MongoDB aggregate pieprasījums ar PHP palīdzību ? Meiģināšu šādu: http://php.net/manual/en/mongocollection.aggregate.php, bet neizdodas. Stāv Xampp ar PHP 5.6 uz Windows 7. Dataseti: { "_id": { "$oid": "58868a5737d44aec0c86ea7d" }, "serial": "0002100032", "topic": "TEMPERATURE", "payload": { "temp-ch1-0002100032": "46.50" }, "_msgid": "dbf9bde5.643f6", "timestamp": "2017-01-23T22:57:27.741Z" } { "_id": { "$oid": "58868a5737d44aec0c86ea7f" }, "serial": "0002100032", "topic": "TEMPERATURE", "payload": { "temp-ch2-0002100032": "40.19" }, "_msgid": "dbf9bde5.643f6", "timestamp": "2017-01-23T22:57:27.748Z" } { "_id": { "$oid": "58868b8137d44aec0c86eaa7" }, "serial": "0002100032", "topic": "TEMPERATURE", "payload": { "temp-ch1-0002100032": "46.50" }, "_msgid": "76b17f37.89414", "timestamp": "2017-01-23T23:02:25.745Z" } { "_id": { "$oid": "58868b8137d44aec0c86eaa9" }, "serial": "0002100032", "topic": "TEMPERATURE", "payload": { "temp-ch2-0002100032": "40.19" }, "_msgid": "76b17f37.89414", "timestamp": "2017-01-23T23:02:25.750Z" } Vēlos nosummēt "temp-ch2-0002100032". $usage = $db->Usage->aggregate(array('$serial' => array('payload' => 'temp-ch1-6F0011'))); Loģiski kļūda: Fatal error: Uncaught exception 'MongoResultException' with message 'ds029486.mlab.com:29486: Unrecognized pipeline stage name: '$serial'' in C:\xampp2\htdocs\mongodb.php:8 Stack trace: #0 C:\xampp2\htdocs\mongodb.php(8): MongoCollection->aggregate(Array) #1 {main} thrown in C:\xampp2\htdocs\mongodb.php on line 8 Aizmirsu piemirst, ka MongoDB esmu izcils iesācējs, bet pats MongoDB strādā un saslēgums strādā, `find` var pielietot un izgūt kādu rezultātu. Ceru uz izpratni.