Question

我的mongo聚合查询是这样的：

db.events.aggregate({
    "$match" : { $or : [ 
             {"event_state" : "live"},
             {
                 $and: [
                    {"event_state" : "scheduled"},
                    {"schedule.start_time" : { "$gt" : ISODate("2016-12-15T14:06:00.000Z")}}
                    ]
             }
            ] 
        } }, 
        { "$sort" : { "schedule.start_time" : 1}} , 
        { "$project" : { 
            "registered_users_count" : { "$size" : [ "$registered_users"]} , 
            "event_image" : 1 , "celebrity" : 1 , "name" : 1 , "category" : 1 , 
            "schedule" : 1 , "online_moderator" : 1 , "offline_moderator" : 1 , 
            "region" : 1 , "status" : 1 , "event_state" : 1 , "recorder_id" : 1 , 
            "webcast_url" : 1 , "replay_url" : 1
        }})

我尝试了类似下面的内容

变式1：

matchCondition = Aggregation.match(Criteria.where("event_state")
                    .is("scheduled").and("schedule.end_time").gt(d)
                    .orOperator(Criteria.where("event_state").is("live")));

变式2：

matchCondition = Aggregation.match(Criteria
                    .where("event_state")
                    .is("live")
                    .orOperator(
                            Criteria.where("event_state").is("scheduled")
                                    .and("schedule.end_time").gt(d)));

排序和投影条件

sortCondition = Aggregation.sort(Sort.Direction.ASC,
                    "schedule.start_time");

AggregationOperation projectValues = Aggregation.project()
                .and("registered_users").size().as("registered_users_count")
                .and("event_image").as("event_image").and("celebrity")
                .as("celebrity").and("name").as("name").and("category")
                .as("category").and("schedule").as("schedule")
                .and("online_moderator").as("online_moderator")
                .and("offline_moderator").as("offline_moderator").and("region")
                .as("region").and("status").as("status").and("event_state")
                .as("event_state").and("recorder_id").as("recorder_id")
                .and("webcast_url").as("webcast_url").and("replay_url")
                .as("replay_url");

Aggregation aggrigation = Aggregation.newAggregation(matchCondition,
                sortCondition, projectValues);

Variant 1和Variant 2都没有产生所需的条件。那么如何实现呢？

Answer 1

形成spring-data-mongo API documentation Criteria.OrOperators将多个Criteria作为参数形成一个或类似的操作。因此，解决方法如下：

trait PetSearcher[T] {
  def search(what: T): Unit = {
    println("default searching")
  }
}

class DogSearcher extends PetSearcher[Ball] {
  override def search(what: Ball): Unit = {
    println("dog searching")
  }
}

如何在Spring中编写这种mongo聚合匹配条件？

1 个答案: