[当我尝试投影在java.util.Map
内部的值时,我得到下面的异常。但是当我在roboMongo中运行生成的shell查询时,它就可以工作了。如果有人可以指出这个问题,我将不胜感激。
org.springframework.data.mapping.context.InvalidPersistentPropertyPath: No property Germany found on com.nntn.corona.snapshot.repo.model.StatWithDelta!
spring boot parent: 2.0.5.RELEASE
Criteria matchCriteria = Criteria.where("timestamp").gte(startDate);
MatchOperation match = Aggregation.match(matchCriteria);
SortOperation sort = sort(new Sort(Sort.Direction.ASC, "timestamp"));
// @formatter:off
ProjectionOperation projection = project()
.andExpression("timestamp").as("timestamp")
.andExpression("countries.germany.total").as("total")
.andExpression("countries.germany.today").as("today");
// @formatter:on
Aggregation aggregation = newAggregation(match, sort,projection);
AggregationResults<Document> result = mongoTemplate.aggregate(aggregation, SnapshotEntry.class,
Document.class);
return result.getMappedResults();
Java表示形式>>
@Document(collection = "snpashots") public class SnapshotEntry { @Id private String id; @Type(type = "org.jadira.usertype.dateandtime.joda.PersistentDateTime") @Temporal(TemporalType.TIMESTAMP) private DateTime timestamp; private Map<String, StatWithDelta> countries; private StatEntity total; private StatEntity today; private String source; private String previousRecordId; @Data @NoArgsConstructor @AllArgsConstructor public class StatWithDelta { private StatEntity total; private StatEntity today; } }
[Json表示形式
{
"_id" : "21-03-2020",
"timestamp" : ISODate("2020-03-21T09:26:00.965Z"),
"countries" : {
"germany" : {
"total" : {
"born" : NumberLong(81008),
"dead" : NumberLong(3255),
"sick" : NumberLong(30000)
},
"today" : {
"born" : NumberLong(50),
"dead" : NumberLong(10),
"sick" : NumberLong(12)
}
}
},
"_class" : "com.nntn.snapshot.repo.model.SnapshotEntry"
}
问题当我尝试投影java.util.Map内部的值时,出现下面的异常。但是当我在roboMongo中运行生成的shell查询时,它就可以工作了。如果...
问题出在TypedAggregation中。这是一种特殊的聚合,其中Spring保留输入聚合类型的信息。