LookupOperation.newLookup（）无法找到指定的集合名称

Question

我有一个功能齐全的Spring Boot应用程序，可从mongodb进行读写。现在尝试实现查找，但是下面的代码无法找到“ project_following”集合，而仅返回“ project”集合的结果。当我交换集合名称时，结果将被反转，表明聚合本身是可行的，但无法找到“ LookupOperation.newLookup（）.from（“ project_following”））“”

中提到的集合

它成功返回了ProjectJoinSample.class对象，但是没有返回来自project_following集合的数据。

收藏： project_following

@media print{
  .notPrintable {
    display: none !important;
    }
}

项目

{
    "_id" : "96e6c39c-be1f-4d22-9f05-957cb8d92c6b",
    "count" : 1,
    "userNames" : [ 
        "DE10210"
    ]
}

配置：

{
    "_id" : "96e6c39c-be1f-4d22-9f05-957cb8d92c6b",
    "userName" : "AB10210",
    "name" : "Super Fun Time Beer",
    "description" : "Beer for fun"
}

application.properties：

@Value("${com.mongodb.collection.project:project}")
private String projectCollectionName;

@Bean
public String projectCollectionName() {
    return this.projectCollectionName;
}

@Value("${com.mongodb.collection.project.following:project_following}")
private String projectFollowingCollectionName;

@Bean
public String projectFollowingCollectionName() {
    return this.projectFollowingCollectionName;
}

代码：

com.mongodb.collection.project=project
com.mongodb.collection.project.following=project_following

预期结果：

LookupOperation lookupOperation = LookupOperation.newLookup()                      
  .from("project_following"))
  .localField("_id")
  .foreignField("_id")
  .as("project_join");

Aggregation aggregation = Aggregation.newAggregation(Aggregation.match(Criteria.where("_id").is("96e6c39c-be1f-4d22-9f05-957cb8d92c6b")) , lookupOperation);

List<ProjectJoinSample> results = mongoTemplate.aggregate(aggregation, Project.class, ProjectJoinSample.class).getMappedResults();

实际结果：

{
    "_id" : "96e6c39c-be1f-4d22-9f05-957cb8d92c6b",
    "userName" : "AB10210",
    "name" : "Super Fun Time Beer",
    "description" : "Beer for fun!",
    "project_join" : [ 
        {
            "_id" : "96e6c39c-be1f-4d22-9f05-957cb8d92c6b",
            "count" : 1,
            "userNames" : ["DE10210"]
        }
    ]
}