Spring boot 将mongodb$reduce代码转换为spring引导_Spring Boot_Spring Mongodb_Spring Mongo

Spring boot 将mongodb$reduce代码转换为spring引导

spring-boot

Spring boot 将mongodb$reduce代码转换为spring引导,spring-boot,spring-mongodb,spring-mongo,Spring Boot,Spring Mongodb,Spring Mongo,我需要将下面的代码转换为spring boot mongodb api instName : {$reduce: { input : { $setUnion: "$accounts.instName"}, initialValue: "", in: { $concat : ["$$value", "$$this", ", "] }}} 我试过了 ArrayOperators.arrayOf(SetOperators.SetUnion.ar

我需要将下面的代码转换为spring boot mongodb api

instName : {$reduce: { 
        input : { $setUnion: "$accounts.instName"}, 
        initialValue: "", 
        in: { $concat : ["$$value", "$$this", ", "] }}}

我试过了

 ArrayOperators.arrayOf(SetOperators.SetUnion.arrayAsSet("accounts.institutionDetails.instName")).reduce(StringOperators.valueOf("$$value").concat("$$this").concat(", ")).startingWith("")

低于误差

org.springframework.data.mapping.PropertyReferenceException: No property $$value found for type Application!

任何帮助都是适当的