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情况

我有运动员名单lst_ath

lst_ath <- structure(list(`1` = structure(c("1125266", "ath_1"), .Names = c("id", 
"name")), `2` = structure(c("1125265", "ath_2"), .Names = c("id", 
"name")), `3` = structure(c("1125264", "ath_3"), .Names = c("id", 
"name")), `4` = structure(c("1125263", "ath_4"), .Names = c("id", 
"name")), `5` = structure(c("1125262", "ath_5"), .Names = c("id", 
"name")), `6` = structure(c("1125261", "ath_6"), .Names = c("id", 
"name")), `7` = structure(c("1125260", "ath_7"), .Names = c("id", 
"name")), `8` = structure(c("1125259", "ath_8"), .Names = c("id", 
"name")), `9` = structure(c("1125258", "ath_9"), .Names = c("id", 
"name")), `10` = structure(c("1125257", "ath_10", "(NZ)"), .Names = c("id", 
"name", "country"))), .Names = c("1", "2", "3", "4", "5", "6", 
"7", "8", "9", "10"))

和一个名为“athletes”的本地 mongodb 的连接，以及一个名为“athletes”的集合

> library(rmongodb)
> mongo <- mongo.create()
> 
> #check connection
> mongo.is.connected(mongo)
[1] TRUE
> 
> #set the database
> db <- "athletes"
> mongo.get.database.collections(mongo, db)
[1] "athletes.athletes"

和列表中的一个mongo.bson对象querylst_ath

query <- mongo.bson.from.list(lst_ath)
str(query)
Class 'mongo.bson'  atomic [1:1] 0
  ..- attr(*, "mongo.bson")=<externalptr> 
>

问题

我正在尝试使用 批量插入query对象mongo.insert.batch(mongo, db, query)，但出现错误：

> mongo.insert.batch(mongo, db, query)
Error in mongo.insert.batch(mongo, db, query) : 
  Expected a list of mongo.bson class objects

当我用和我的节目创建query时，我无法找出错误。mongo.bson.from.list(lst_ath)str(query)Class 'mongo.bson' atomic [1:1] 0

我错过了什么？

更新

除了@NicE 的解决方案，我还需要定义要插入的集合，而不仅仅是数据库，即：

> #set the database
> db <- "athletes.athletes"
4

1 回答 1

3

mongo.bson.from.list当您调用向量列表时，看起来您正在创建一个数组。由于mongo.insert.batch需要query是 'mongo.bson' 的列表，它会给你一个错误。

试试这个：

#make a mongo bson for each element of lst_ath
query <- lapply(lst_ath,function(x){mongo.bson.from.list(as.list(x))})


#check that query is a list of mongo.bson objects
str(query)
#List of 10
# $ 1 :Class 'mongo.bson'  atomic [1:1] 0
#  .. ..- attr(*, "mongo.bson")=<externalptr> 
# $ 2 :Class 'mongo.bson'  atomic [1:1] 0
#  .. ..- attr(*, "mongo.bson")=<externalptr> 
# $ 3 :Class 'mongo.bson'  atomic [1:1] 0
#  .. ..- attr(*, "mongo.bson")=<externalptr> 


#insert them
mongo.insert.batch(mongo, db, query)
于 2015-02-19T16:11:34.337 回答