Spring數據Mongodb排序內部數組

我一直在嘗試根據日期對存儲在列表中的項目進行排序。這裏是我的文檔的結構：Spring數據Mongodb排序內部數組

{ 
    "_id": ObjectId("55c1940ce4b0a2a0482f22e8"), 
    "eventId": "45b73f69-4804-4b50-84d0-6c551aa5bb5c", 
    "isMacro": true, 
    "isDeleted": false, 
    "calendarEvent": [ 
    { 
     "eventId": "b89a1519-ddff-4f71-9366-117e23c16d5c", 
     "startDateTime": ISODate("2017-04-16T10:00:00.000Z") 
    }, 
    { 
     "eventId": "ecec8b3a-cf48-4f14-a7ac-14cd1a19f9da", 
     "startDateTime": ISODate("2014-03-25T10:00:00.000Z") 
    }, 
    { 
     "eventId": "a002cc47-2939-4e75-9793-74720ebb7a21", 
     "startDateTime": ISODate("2015-09-10T10:00:00.000Z") 
    } 
    ] 
}

我想在ASC順序calendarEvent列表中的項目進行排序。我正在使用Spring Data MongoDB。這裏是我的代碼：

AggregationOperation unwind = Aggregation.unwind("calendarEvent"); 
AggregationOperation match = Aggregation.match(criteria); 
AggregationOperation project = getEventProjectionFields(); //private function which returns project object. 
AggregationOperation sort = Aggregation.sort(Direction.ASC, 
     "calendarEvent.startDateTime"); 

Aggregation aggregation = Aggregation.newAggregation(unwind, match, 
     project, skip(0), limit(5), sort); 

AggregationResults<Event> groupResults = mongoTemplate.aggregate(
     aggregation, mongoTemplate.getCollectionName(KAEvent.class), 
     Event.class); 

return groupResults.getMappedResults();

印刷aggregation.toString()返回以下JSON值：

{ 
    "aggregate": "__collection__", 
    "pipeline": [ 
    { 
     "$unwind": "$calendarEvent" 
    }, 
    { 
     "$match": { 
     "isMacro": true, 
     "isDeleted": false, 
     "$and": [ 
      { 
      "eventId": { 
       "$in": [ 
       "3d478f1a-9296-46b5-87d9-d0b442be0309", 
       "4cbbe84b-6a35-4797-8c06-9b9b679ca48c" 
       ] 
      } 
      }, 
      { 
      "calendarEvent.eventId": { 
       "$in": [ 
       "cb3fb7e7-5444-4ca5-8a6b-09e74bd346e4", 
       "fec94eb6-160d-4608-8dae-5b43b88c550f", 
       "e33d11a1-6d36-49ce-9e84-9b83ee9445dd" 
       ] 
      } 
      } 
     ], 
     "calendarEvent.startDateTime": { 
      "$gte": { 
      "$date": "2015-10-13T07:42:48.841Z" 
      } 
     } 
     } 
    }, 
    { 
     "$project": { 
     "eventId": "$calendarEvent.eventId", 
     "name": "$calendarEvent.name", 
     "eventDescription": "$calendarEvent.eventDescription", 
     "eventSummary": "$calendarEvent.eventSummary", 
     "eventLocation": "$calendarEvent.eventLocation", 
     "startDateTime": "$calendarEvent.startDateTime", 
     "endDateTime": "$calendarEvent.endDateTime", 
     "lastUpdateDate": "$calendarEvent.lastUpdateDate", 
     "eventUrl": "$calendarEvent.eventUrl", 
     "customImageUrl": "$calendarEvent.customImageUrl", 
     "tagsList": "$calendarEvent.tagsList", 
     "imagesList": "$calendarEvent.imagesList", 
     "isFeatured": "$calendarEvent.isFeatured", 
     "isDeleted": "$calendarEvent.isDeleted", 
     "providerId": 1, 
     "sourceId": 1, 
     "isMacro": 1, 
     "isCalendarEvent": 1, 
     "_class": "$calendarEvent._class", 
     "parenteventId": "$eventId" 
     } 
    }, 
    { 
     "$skip": 0 
    }, 
    { 
     "$limit": 5 
    }, 
    { 
     "$sort": { 
     "calendarEvent.startDateTime": 1 
     } 
    } 
    ] 
}

這一切後，返回的結果進行排序。我在這裏錯過了什麼或做錯了什麼？

來源

2015-10-13 Sibtain Norain

你的項目的新領域startDateTime這是從嵌入式領域"calendarEvent.startDateTime"導出後，您都做了排序。

更改排序管道

AggregationOperation sort = Aggregation.sort(Direction.ASC, 
     "startDateTime");

來源

2015-10-13 11:40:59 chridam

嘗試這樣很好，但仍然得到不正確的排序順序。 –

您是否還嘗試在文檔[** here **]中建議的限制管道之前進行排序（http://docs.mongodb.org/manual/core/aggregation-pipeline-optimization/#sort-limit合併）和[**存在**]（http://docs.mongodb.org/manual/reference/operator/aggregation/sort/#sort-limit-memory-optimization）以獲得更好的性能？ – chridam

@SibtainNorain：我有同樣的要求，仍然無法使其工作。您能否確認Chridam爲您提供的解決方案，並且您未對上述原始代碼進行其他更改？ – shkhssn

Spring數據Mongodb排序內部數組

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