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我正在尝试获取 Oject 值的数组，但它给出了空值。我需要 从下面的文档中获取结果值。

电子邮件系统-->结果

 { 

"_id" : ObjectId("5f0890e870e631865877e"), 

"user" : "testuser", 
"Email" : "testuser@sample.com", 
"Batch Systems" : [
    "STAR", 
    "STORY", 
    "ITEMS", 
    
   
], 
"Email Systems" : [
    {
        "System1" : {
            "System" : "Backend", 
            **"result"** : true
        }
    }, 
    {
       "System2" : {
            "System" : "Backend", 
            "result" : true
        }
    }
],

下面是代码片段：

@RequestMapping(value = "/search", method = RequestMethod.GET)
    public Object getClaimsBySearchCriteria(@RequestParam(value = "userId") String userId){
    MongoDatabase database = this.mongoClient.getDatabase(test);
    MongoCollection<Document> users = database.getCollection(Systems);
     List<? extends Bson> pipelinesVal = Arrays.asList(
                new Document()
                        .append("$unwind", "$Email Systems"),
                new Document()
                        .append("$match",  new Document().append("Email Systems","$Email Systems")),
                new Document()
                        .append("$project", new Document()
                                .append("_id", 1)
                                .append("items", 1)

                        ));
        List<Document> Val = new ArrayList<>();
        List values=users.aggregate(pipelinesVal).into(Val);
        Document docSourceSystem =new Document();
        List<Document> aggregate = new ArrayList<>();
        LOG.info("pipelinesVal: " + pipelinesVal.toString());
       LOG.info("values: " + values.toString());
}

上面的代码结果值是空的，而不是 true 或 false。任何人都可以帮我解决这个问题。上面的代码出了什么问题

4

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