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私は次の収集持っている:私は '状況' 列でグループにしようとしているMongoDBの集約フレームワークとPython
{"status": "new", "date": {"$date": 1334841845571}, "_id": {"$oid": "4f901223e4b0c2899fb22da0"}, "description": "description 1", "number": "01"}
{"status": "new", "date": {"$date": 1334841845571}, "_id": {"$oid": "4f90126fe4b0c2899fb22da1"}, "description": "description 1", "number": "02"}
{"status": "new", "date": {"$date": 1334841845571}, "_id": {"$oid": "4f901276e4b0c2899fb22da2"}, "description": "description 1", "number": "03"}
{"status": "blocked", "date": {"$date": 1332163445571}, "_id": {"$oid": "4f901286e4b0c2899fb22da3"}, "description": "description 1", "number": "04"}
{"status": "blocked", "date": {"$date": 1332163445571}, "_id": {"$oid": "4f90128ee4b0c2899fb22da4"}, "description": "description 1", "number": "05"}
{"status": "blocked", "date": {"$date": 1332163445571}, "_id": {"$oid": "4f901292e4b0c2899fb22da5"}, "description": "description 1", "number": "06"}
を:
cursor = db.command('aggregate', table, pipeline=[
{'$project': {u'date': 1, u'status': 1, u'number': 1, u'description': 1}}
{'$group': {'_id': u'$status'}}])
しかし、私はこの取得:
"ok"
"result"
を
なぜですか?
私は結果がカーソル['result']であることを発見しましたが、$ projectに指している列はありません {u'ok ':1.0、u'result':[{あなたは_id列だけを表示しますが、日付、ステータス、番号、説明も必要です – KennyPowers