java - MongoDB 聚合变化以匹配天数差异匹配

Question

此聚合可能会发生什么变化，以获得结果或项目，其中天数 =(数字)和 $acceptedDate 的差异大于 $liveDate - x 天

    AggregationOperation redact = new AggregationOperation() {
        @Override
        public DBObject toDBObject(AggregationOperationContext aggregationOperationContext) {
        Map<String, Object> map = new LinkedHashMap<>();
        map.put("if",  BasicDBObject.parse("{'$gte':[{'$subtract':[{'$ifNull':['$acceptedDate', 
{'$date':" + System.currentTimeMillis() + "}]},'$lastVisit' **here minus x days **]},1296000000]}}")); //and the difference is 10 days
        map.put("then", "$$KEEP");
        map.put("else", "$$PRUNE");
        return new BasicDBObject("$redact", new BasicDBObject("$cond", map));
    };

    Aggregation aggregation = Aggregation.newAggregation(redact);

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

基本上，参数作为变体传递，他们希望匹配天数差异(例如显示差异为 5 天的记录)，但在这种情况下，lastVisit 应为负 5 天。

Answer 1

您可以使用以下查询。

BasicDBObject.parse("
  {'$eq':[
     {'$subtract':[
       {'$ifNull':['$acceptedDate',{'$date':" + System.currentTimeMillis() + "}]},
       {'$subtract':['$lastVisit', 216000000]} // 5 days
     ]}, 
     432000000 // 10 days
  ]}"
);