Unrecognized pipeline stage name: '$unwind'

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    • Type: Bug
    • Resolution: Works as Designed
    • Priority: Major - P3
    • None
    • Affects Version/s: None
    • Component/s: None
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      I am trying to make an aggregate query using this simple array:

      [
            [
                '$match' => ['deck_id' => 18],
            ],
            [
                '$project' => [
                    'stack' => 1,
                ]
            ],
            [
                '$unwind' => '$stack'
            ],
            [
                '$group' => [
                    '_id' => '$stack.response',
                    'responses' => [
                        '$push' => '$$ROOT.stack'
                    ]
                ]
            ],
            [
                '$project' => [
                    'responses_count' => ['$size' => '$responses']
                ]
            ]
        ]

      But I am getting the following exception: Unrecognized pipeline stage name: '$unwind'

      **The following query in Robo 3T(an client for mongodb) works on the same server:

      db.getCollection('game_statistics').aggregate([
    {$match: {deck_id: 18}},
    {$project: {stack: 1}},
    {$unwind: "$stack"},
    {$group: {_id: "$stack.response", responses: {$push: "$$ROOT.stack"}}},
    {$project: {responses_count: {'$size': "$responses"}}}
])

        1. vQQW5dJV.php
          0.9 kB

            Assignee:
            Derick Rethans
            Reporter:
            filip pacurar
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              Created:
              Updated:
              Resolved: