Question

这是我的JSON。

{
    "_id" : ObjectId("5c7a590350d039fdc86e4e37"),
    "cropData" : {
        "cropName" : "RICE",
        "crop" : "RICE",
        "cropAcres" : 10.0,
        "cropYield" : 73.0,
        "cropPrice" : 3619.0
    },
    "creationTime" : "1551521509975",
    "villageId" : "581edb59e4b0b5b1ebbfe757"
}

“收藏夹”中有1000个这样的条目，名为FarmerCropDataLog。我想从这个FarmerCropDataLog中获取特定村庄的最高和平均值。为此，我编写了以下代码。

public void getSheet(GetComparisonSheetRequest getComparisonSheet, BasicResponse response,String requestFarmerId) {

            Farmer farmer = this.getFarmerById(requestFarmerId);

            //  get logs before this year..
            String villageId = farmer.getVillageId();

            MatchOperation matchOperation = Aggregation.match(Criteria.where(FarmerCropDataLog.Constants.CROP_LOG).elemMatch(Criteria.where(CropData.Constants.CROP).is(getComparisonSheet.getCrop()))
                                    .andOperator(Criteria.where(FarmerCropDataLog.Constants.VILLAGE_ID).is(villageId))
                                    .andOperator(Criteria.where(FarmerCropDataLog.Constants.CREATION_TIME).gt(LAST_YEAR)));

            GroupOperation groupOperation  = Aggregation.group(FarmerCropDataLog.Constants.VILLAGE_ID);
            groupOperation.avg(CropData.Constants.CROP_PRICE).as("averageIncome");
            groupOperation.max(CropData.Constants.CROP_PRICE).as("maxIncome");

            Aggregation aggregation = Aggregation.newAggregation(matchOperation,groupOperation);
            AggregationResults<GetComparisonSheetResponse> aggregationResults = farmerCropDataLogDAO.runAggregation(aggregation,FarmerCropDataLog.class,GetComparisonSheetResponse.class);  
            List<GetComparisonSheetResponse> getResult = aggregationResults.getMappedResults();

            GetComparisonSheetResponse comparisonSheetResponse = getResult.get(0);
            response.setResponse(comparisonSheetResponse);
            response.setSuccess(true);
        }

尝试运行farmerCropDataLogDAO.runAggregation时出现错误。它引发异常，我该如何成功运行？

引发异常：

Due to limitations of the com.mongodb.BasicDBObject, you can't add a second '$and' expression specified as '$and : [ { "creationTime" : { "$gt" : 1471228928}}]'. Criteria already contains '$and : [ { "villageId" : "5b0ed0bc77c8ae9704f65c43"}]'.

Answer 1

好的，所以感谢他，我通过更改@Neil建议的代码来解决了我的问题。

我已从

更改了此代码

MatchOperation matchOperation = Aggregation.match(Criteria.where(FarmerCropDataLog.Constants.CROP_LOG).elemMatch(Criteria.where(CropData.Constants.CROP).is(getComparisonSheet.getCrop()))
                                    .andOperator(Criteria.where(FarmerCropDataLog.Constants.VILLAGE_ID).is(villageId))
                                    .andOperator(Criteria.where(FarmerCropDataLog.Constants.CREATION_TIME).gt(LAST_YEAR)));

对此->

MatchOperation matchOperation = Aggregation.match(Criteria.where(FarmerCropDataLog.Constants.CROP_LOG).elemMatch(Criteria.where(CropData.Constants.CROP).is(getComparisonSheet.getCrop())
                    .and(FarmerCropDataLog.Constants.VILLAGE_ID).is(villageId)
                    .and(FarmerCropDataLog.Constants.CREATION_TIME).gt(LAST_YEAR)));

MongoDB Spring聚合引发异常

1 个答案: