如何定义MogoOperations聚合函数中的输出类型？

Question

我正在研究MongoOperations的聚合函数，以便使用Spring数据进行某种中间层查询。正如aggregate（）函数的文档中所定义的：http://docs.spring.io/spring-data/mongoDB/docs/current/api/org/springframework/data/mongoDB/core/mongooperations.html#aggregate-org.springframework.data.mongodb.core.aggregation.aggregation-java.lang.class-java.lang.class

outputType-返回列表的参数化类型不能为NULL。

但是我不确定，我应该如何定义那个类/对象。以下是我的查询：

    ApplicationContext ctx = new AnnotationConfigApplicationContext(MongoConfig.class);
    MongoOperations mongoOperation = (MongoOperations) ctx.getBean("mongoTemplate"); 

    AggregationOperation match = Aggregation.match(Criteria.where("country").is("tigo"));
    AggregationOperation unwind = Aggregation.unwind("myDetails");
    AggregationOperation match2 = Aggregation.match(Criteria.where("myDetails.type").is("health"));
    AggregationOperation sort = Aggregation.sort(Sort.Direction.ASC, "myDetails.datetime");
    AggregationOperation limit = Aggregation.limit(1);

    Aggregation aggregation = Aggregation.newAggregation(match, unwind, match2, sort, limit);
    System.out.println("Aggregation = "+aggregation);
    AggregationOutput output = mongoOperation.aggregate(aggregation, "gui_data", outputType);

outputType是我需要定义的。有人能帮我吗？

Answer 1

我尝试了dto类，所以将返回值映射到dto类将很有用