我试图使用Spring Data MongoDB 3.6-rc4执行聚合操作。

Aggregation agg = newAggregation(

lookup("orders", "orderId", "_id", "order")

);

List results = mongoOperations.aggregate(agg, "transactions", BasicDBObject.class).getMappedResults();

但是在运行查询时出现以下错误

2019-11-24 17:03:41,539 WARN org.springframework.data.mongodb.core.MongoTemplate : Command execution of { "aggregate" : "transactions" , "pipeline" : [ { "$lookup" : { "from" : "orders" , "localField" : "orderId" , "foreignField" : "_id" , "as" : "order"}}]} failed: The 'cursor' option is required, except for aggregate with the explain argument

2019-11-24 17:03:41,574 ERROR org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.InvalidDataAccessApiUsageException: Command execution failed: Error [The 'cursor' option is required, except for aggregate with the explain argument], Command = { "aggregate" : "transactions" , "pipeline" : [ { "$lookup" : { "from" : "orders" , "localField" : "orderId" , "foreignField" : "_id" , "as" : "order"}}]}; nested exception is com.mongodb.MongoCommandException: Command failed with error 9: 'The 'cursor' option is required, except for aggregate with the explain argument' on server localhost:27017. The full response is { "ok" : 0.0, "errmsg" : "The 'cursor' option is required, except for aggregate with the explain argument", "code" : 9, "codeName" : "FailedToParse" }] with root cause

com.mongodb.MongoCommandException: Command failed with error 9: 'The 'cursor' option is required, except for aggregate with the explain argument' on server localhost:27017. The full response is { "ok" : 0.0, "errmsg" : "The 'cursor' option is required, except for aggregate with the explain argument", "code" : 9, "codeName" : "FailedToParse" }

at com.mongodb.CommandResult.getException(CommandResult.java:80) ~[mongo-java-driver-3.5.0.jar:na]

at com.mongodb.CommandResult.throwOnError(CommandResult.java:94) ~[mongo-java-driver-3.5.0.jar:na]

at org.springframework.data.mongodb.core.MongoTemplate.handleCommandError(MongoTemplate.java:2100) ~[spring-data-mongodb-1.10.8.RELEASE.jar:na]

at org.springframework.data.mongodb.core.MongoTemplate.aggregate(MongoTemplate.java:1577) ~[spring-data-mongodb-1.10.8.RELEASE.jar:na]

at org.springframework.data.mongodb.core.MongoTemplate.aggregate(MongoTemplate.java:1505) ~[spring-data-mongodb-1.10.8.RELEASE.jar:na]

提前致谢！！