Java/MongoDB-如何解决错误“例外:管道元素0不是对象". [英] Java/MongoDB - How to resolve error "exception: pipeline element 0 is not an object"

问题描述

我正在使用aggregate()方法，并在游标中查找我正在使用以下代码的结果

I am using aggregate() method and looking result in cursor for that I am using below code

                 dbObjArray = new BasicDBObject[2]
                 dbObjArray[0]= cruxLevel
                 dbObjArray[1] = project
                // dbObjArray[2] = out
                 List<DBObject> pipeline = Arrays.asList(dbObjArray)
                 if (!datasetObject?.isFlat && jsonFor != 'collection-grid') {
                     println '-------------------------------- inside if block bbb--------------------------------------'
                     output= dataSetCollection.aggregate(pipeline)
                 }else{

                     /*DBObject out = new BasicDBObject('$out':"datasetTemp");
                     def db = getDB()*/

                     println '-------------------------------- inside else block--------------------------------------'

                      AggregationOptions aggregationOptions = AggregationOptions.builder()
                     .batchSize(100)
                     .outputMode(AggregationOptions.OutputMode.CURSOR)
                     .allowDiskUse(true)
                     .build();

                     output = dataSetCollection.aggregate(project)
                 }

我遇到了错误.

com.mongodb.CommandFailureException:{"serverUsed": "127.0.0.1:15847"，"errmsg":例外:管道元素0不是 对象"，代码":15942，确定":0.0}

com.mongodb.CommandFailureException: { "serverUsed" : "127.0.0.1:15847" , "errmsg" : "exception: pipeline element 0 is not an object" , "code" : 15942 , "ok" : 0.0}

我要去哪里了，请帮忙！

Where I'm going wrong please help!

谢谢.

推荐答案

def dbObjArray = new BasicDBObject[1]
dbObjArray[0]= project
List<DBObject> flatPipeline = Arrays.asList(dbObjArray)

AggregationOptions aggregationOptions = AggregationOptions.builder()
                                        .batchSize(100)
                                        .outputMode(AggregationOptions.OutputMode.CURSOR)
                                        .allowDiskUse(true)
                                        .build();
def cursor = dataSetCollection.aggregate(flatPipeline,aggregationOptions)

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