Question

我有两个收藏夹：公司：

{
  "_id" : "1", 
  "company_code" : "A-111", 
  "code_description" : "BGI", 
  "out_company_code" : "A-111"
}

成本中心：

{
   "_id" : "2, 
   "company_id" : "1", //Company id
   "home_cost_center" : "1111", 
   "home_cost_center_description" : "Finance"
}

我希望查询结果如下：

{
  "_id" : "2, 
   "company_id" : "1", 
   "home_cost_center" : "1111", 
   "home_cost_center_description" : "Finance",
   "company": {
       "_id" : "1", 
       "company_code" : "A-111", 
       "code_description" : "BGI", 
       "out_company_code" : "A-111"
   }
}

为此，我创建了此查询

String queryWithCompanyCode = "   { '$lookup': {" +
        "    'from': 'company'," +
        "    'let': { 'codeId': '$company_id' }," +
        "    'pipeline': [" +
        "      { '$match': { '$expr': { '$eq': [{ '$toString': '$_id' }, '$$codeId'] }}}" +
        "    ]," +
        "    'as': 'companyCode'" +
        "  }}," +
        "  {'$unwind': '$companyCode'}";

ObjectId objectId = new ObjectId(id);
        AggregationOperation operation = Aggregation.match(
            Criteria.where("_id").is(objectId)
        );

        TypedAggregation<T> typedAggregation = Aggregation.newAggregation(Output.class, operation, new CustomAggregationOperation(queryWithCompanyCode));
        T result = operations.aggregate(typedAggregation, CostCenter.class, Output.class).getUniqueMappedResult();

通过上面的查询，我得到以下结果：

{
      "_id" : "2, 
       "company_id" : null, 
       "home_cost_center" : null, 
       "home_cost_center_description" : null,
       "company": {
           "_id" : "1", 
           "company_code" : "A-111", 
           "code_description" : "BGI", 
           "out_company_code" : "A-111"
       }
    }

我正在使用Spring：2.1.10和mongodb：4.2.1。奇怪的是，当我在数据库中运行此查询时，它可以正常运行，但在春季无法正常运行，而且我无法弄清楚这里出了什么问题。

$ unwind在mongodb聚合中（春季）

0 个答案: