本文介绍了Spring Data MongoDB-聚合框架-组操作中的无效引用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我使用Spring Data(1.3.0.RC1)访问我们的MongoDB，对于某些新查询，我想使用聚合框架.
I use Spring Data (1.3.0.RC1) to access our MongoDB and for some new queries I want to use the aggregation framework.
在mongo shell中，命令为:
In the mongo shell the command would be:
db.spotreports.aggregate(
{ "$unwind" : "$pd"} , { "$group" : { "_id" : "$pd.PDch", "base" : {$sum : "$pd.aBL"}, "uplift" : {$sum : "$pd.up"}}})
{
"result" : [
{
"_id" : 5,
"base" : 529133,
"uplift" : 21516
},
...
我使用的Spring代码是:
The Spring Code I use is:
Aggregation agg = Aggregation.newAggregation(
Aggregation.unwind("pd"),
Aggregation.group("pd.PDch").sum("pd.aBL").as("base").sum("pd.up").as("uplift")
);
AggregationResults<SpotReportResult> result = mongoTemplate.aggregate(agg, resolveCollection(), SpotReportResult.class);
我收到以下错误:
java.lang.IllegalArgumentException: Invalid reference 'PDch'!
at org.springframework.data.mongodb.core.aggregation.ExposedFieldsAggregationOperationContext.getReference(ExposedFieldsAggregationOperationContext.java:63)
at org.springframework.data.mongodb.core.aggregation.ExposedFieldsAggregationOperationContext.getReference(ExposedFieldsAggregationOperationContext.java:47)
at org.springframework.data.mongodb.core.aggregation.GroupOperation.toDBObject(GroupOperation.java:284)
at org.springframework.data.mongodb.core.aggregation.Aggregation.toDbObject(Aggregation.java:228)
我想知道为什么spring要引用'PDch'而不是'pd.PDch'?
I wonder why spring want to reference 'PDch' instead of 'pd.PDch'?
推荐答案
根据 DATAMONGO-753 应该在最新的快照中修复此问题，并与即将发布的1.3.2错误修正版本和即将发布的Spring Data MongoDB 1.4 M1一起发布.
According to DATAMONGO-753 This should be fixed in the latest snapshots and released with the upcoming 1.3.2 bugfix release and the upcoming 1.4 M1 of Spring Data MongoDB.
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