春数据MongoDB的聚集查询

Question

我和翻译在Spring数据的MongoDB MongoDB的这种挣扎查询：

db.applicates.aggregate(
    [ 
    { 
     "$match": { 
     "claimantCategory": 1 
     } 
    }, 
     { 
     $group : { 
      _id : { month: { $month: "$claimDate" }, day: { $dayOfMonth: "$claimDate" }, year: { $year: "$claimDate" } }, 
     count: { $sum: 1 } 
    } 
    } 
    ] 
) 

我tryed这一点：

TypedAggregation<Applicate> aggregation = newAggregation(Applicate.class, 
      match(Criteria.where("claimantCategory").is(claimantCategory)), 
      project("claimDate") 
        .andExpression("dayOfMonth("+"\""+"claimDate"+"\""+")").as("day") 
        .andExpression("month(claimDate)").as("month") 
        .andExpression("year(claimDate)").as("year"), 
      group(fields().and("day").and("month").and("year")) 
        .count().as("count")); 
AggregationResults<ClaimsAggregator> groupResults = mongoOperations.aggregate(aggregation, ClaimsAggregator.class); 

但它失败例外：可以“T从BSON String类型转换为Date

我Applicate.class：

public class Applicate { 

@Id 
private String id; 

private int claimId; 

@DateTimeFormat (iso = DateTimeFormat.ISO.DATE) 
private Date claimDate; 

private int codeOfForm; 
private String claimStatus; 
private String fio; 
private int claimantCategory; 
private int serviceCode; 
private String subserviceName; 
private String departmentName; 
//getter,setters, constructor 
} 

个

ClaimsAggregator.class：

public class ClaimsAggregator { 
private String claimDate; 
private int count; 
.... 
} 

Answer 1

我找到一个答案！ 为@chridam建议，u需要与此

.andExpression("dayOfMonth(claimDate)").as("day") 

现在，你需要添加更换线

.andExpression("dayOfMonth("+"\""+"claimDate"+"\""+")").as("day") 

.first("claimDate").as("claimDate") 

排队

group(fields().and("day").and("month").and("year")) 

决赛代码：

TypedAggregation<Applicate> aggregation = newAggregation(Applicate.class, 
      match(Criteria.where("claimantCategory").is(claimantCategory)), 
      project("claimDate") 
        .andExpression("dayOfMonth(claimDate)").as("day") 
        .andExpression("month(claimDate)").as("month") 
        .andExpression("year(claimDate)").as("year"), 
      group(fields().and("day").and("month").and("year")).first("claimDate").as("claimDate") 
        .count().as("count"));