如何通过字符向量查找R6对象属性

Question

我有下面的类，它的开头如下：

dataSeries <- R6Class("dataSeries",
                  public = list(
                    geoAccession = NULL,
                    species = NULL,
                    tissue = NULL,
                    seuratObjectPath = NULL,
                    markerType = NULL,
                    clusters = NULL,
                    clusterTable = NULL,
                    clusterSymbols = NULL,
                    clusterPVs = NULL,
                    clusterGIDs = NULL,
                    clusterKGs = NULL,
                    clusterKPs = NULL,
                    clusterKOs = NULL,

我还有另一个类，它的开头如下：

metaSeries <- R6Class("metaSeries",
                  public = list(
                    seriesList = NULL,

                    initialize = function(dataDir="Data/Data_Series/Current"){
                      browser()
                      if(!is.null(dataDir)){
                        toProcess = list.files(dataDir,full.names = T)
                        self$seriesList = vector("list", length(toProcess))
                        count = 1
                        for(file in toProcess){
                          series <- readRDS(file)
                          self$seriesList[[count]] <- series
                          count = count + 1
                        }
                      }
                    },
                    findMetaFeatures = function(feature="clusterKPs", rank=3, plot=TRUE){

实际上，metaSeries$seriesList将被初始化为dataSeries类型的列表。dataSeries$findMetaFeature必须能够调用dataSeries$seriesList[i]$feature，其中功能位于{clusterGID，clusterKGs，clusterKPs，clusterKOs}中。默认情况下，使用feature="clusterKPs“调用findMetaFeatures。在metaSeries$findMetaFeature中，当检查位于self$seriesList中的某个类型为dataSeries的对象时，我需要一种方法将字符串"clusterKPs“与具有该名称的属性进行匹配。

Answer 1

对于将来的参考，Colin FAY是正确的；您应该提供更多的上下文，并且通常至少应该提供重现您的问题所需的最少代码，以帮助其他人真正知道您需要帮助的内容。

也就是说，我相信您正在询问的问题的答案相对简单:您可以通过使用as.list使用字符向量来访问R6类对象的公共字段

library(R6)
myClass <- R6Class('myClass',
                   public = list(
                       someData = NULL,
                       initialize=function(someData = NA){
                           self$someData <- someData
                       },
                       set_someData = function(val){
                           self$someData <- val
                       }
                   )
)
myObject <- myClass$new(someData='a')
class(myObject)
[1] "myClass" "R6"
class(myObject$someData)
[1] "character"
myObject$someData
[1] "a"
as.list(myObject)[['someData']]
[1] "a"

这可以是轻松访问同一R6类的多个对象的同一字段的一种方法。

编辑：

看过您的一些代码后，我会更清楚地了解您想要实现的目标。答案是一样的，您只需在R6类的公共函数中实现它，如下所示：

library(R6)
myClass <- R6Class('myClass',
                   public = list(
                       someData = NULL,
                       initialize=function(someData = NA){
                           self$someData <- someData
                       },
                       set_someData = function(val){
                           self$someData <- val
                       },
                       find_features = function(feature='otherData'){
                           if ( !('list' %in% class(self$someData)) ) {
                               if ( !('mySubClass' %in% class(self$someData)) ){
                                   stop('someData does not have the feature')
                               }
                               return(as.list(self$someData)[feature])
                           }
                           return(lapply(self$someData, function(x){
                               as.list(x)[feature]
                           }))
                       }
                   )
)

mySubClass <- R6Class('mySubClass',
                      public = list(
                          otherData = NULL,
                          initialize = function(otherData = NA){
                              self$otherData <- otherData
                          }
                      )
)

mySubObject1 <- mySubClass$new(otherData=1:3)
mySubObject2 <- mySubClass$new(otherData=4:6)
myObject <- myClass$new(someData=list(mySubObject1, mySubObject2))
myObject$find_features()
[[1]]
[[1]]$otherData
[1] 1 2 3


[[2]]
[[2]]$otherData
[1] 4 5 6

在定义find_features时，您可以通过使用[[feature]]而不是[feature]来消除结果列表的一个级别

myClass <- R6Class('myClass',
                   public = list(
                       someData = NULL,
                       initialize=function(someData = NA){
                           self$someData <- someData
                       },
                       set_someData = function(val){
                           self$someData <- val
                       },
                       find_features = function(feature='otherData'){
                           if ( !('list' %in% class(self$someData)) ) {
                               if ( !('mySubClass' %in% class(self$someData)) ){
                                   stop('someData does not have the feature')
                               }
                               return(as.list(self$someData)[[feature]])
                           }
                           return(lapply(self$someData, function(x){
                               as.list(x)[[feature]]
                           }))
                       }
                   )
)
myObject <- myClass$new(someData=list(mySubObject1, mySubObject2))    
myObject$find_features()
[[1]]
[1] 1 2 3

[[2]]
[1] 4 5 6