"命令失败，错误 168 (InvalidPipelineOperator): '无法识别的表达式 '$match' [英] "Command failed with error 168 (InvalidPipelineOperator): 'Unrecognized expression '$match'

问题描述

获取异常

命令失败，错误 168 (InvalidPipelineOperator): '无法识别的表达式 '$match

Command failed with error 168 (InvalidPipelineOperator): 'Unrecognized expression '$match

我的语法有什么问题?

 String searchString = new String(sourceSystem);
    AggregateIterable<Document> aggregateIterable = users.aggregate(Arrays.asList(new Document("$project", new Document("Email Systems", new Document("$match", new Document("Email Systems.Bob", searchString))))));
    Iterator iterator = aggregateIterable.iterator();
    ArrayList<Document> documents = new ArrayList();
    while (iterator.hasNext()) {
        documents.add((Document) iterator.next());
    }

推荐答案

问题是你在project

应该是stage的array list .第一个元素应该是 match 或 project.

It should be array list of stages. First element should be either match or project.

Document matchDoc = new Document(\*matching condition*/);

Document projectDoc = new Document(/*project doc*/);

传递这两个数组列表.

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