“数据"不是从“名称空间:my_package"导出的对象 [英] 'data' is not an exported object from 'namespace:my_package'

问题描述

我正在编写一个使用外部数据的函数，如下所示:

I'm writing a function that uses an external data as follow:

首先，它检查数据是否在data/文件夹中，如果不在，则创建data/文件夹，然后从github下载文件；

First, it checks if the data is on the data/ folder, if it is not, it creates the data/ folder and then downloads the file from github;

如果数据已经在data/文件夹中，它将读取并执行计算.

If the data is already on the data/ folder, it reads it, and perform the calculations.

问题是，当我跑步时:

devtools::check()

它返回:

Error: 'data' is not an exported object from 'namespace:my_package'

我应该手动在NAMESPACE上放些东西吗?

Should I manually put something on NAMESPACE?

一个例子:

my_function <- function(x){
if(file.exists("data/data.csv")){
    my_function_calculation(x = x)
  } else {
    print("Downloading source data...")
    require(RCurl)
    url_base <-
 getURL("https://raw.githubusercontent.com/my_repository/data.csv")
    dir.create(paste0(getwd(),"/data"))
    write.table(url_base,"data/data.csv", sep = ",", quote = FALSE)
    my_function_calculation(x = x)
  }
}

my_function_calculation <- function(x = x){
    data <- NULL
    data <- suppressMessages(fread("data/data.csv"))
    #Here, I use data...
    return(data)
}

推荐答案

在每种情况下都不尽相同，但是我已经通过删除R/文件夹中的data.R文件解决了该问题.

It could not be the same in every case, but I've solved the problem by removing the data.R file on R/ folder.

data.R是一个文件，描述了包中提供的所有数据.自从我的代码的上一版本以来，我就拥有它，它具有内置的数据，而不是远程(要下载)的数据. 删除文件解决了我的问题.

data.R is a file describing all data presented in the package. I had it since the previous version of my code, that had the data built in, not remote (to be downloaded). Removing the file solved my problem.

数据示例.R:

#' Name_of_the_data
#'
#' Description_of_the_Data
#'
#' @format A data frame with 10000 rows and 2 variables:
#' \describe{
#'   \item{Col1}{description of Col1}
#'   \item{Col2}{description of Col2}
#' }
"data_name"

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