R包未能通过devtools :: check，因为“找不到函数”即使该功能已导入NAMESPACE [英] R package fails devtools::check, because "could not find function" even though the function is imported in NAMESPACE

问题描述

尝试使用 roxygen2 和 devtools R 软件包$ c>。我在 @examples <中添加了使用％>％和 mutate 的函数/ code>部分。当我运行 check（）时，它失败了，因为它找不到函数％>％或变异。

Trying to build my first R package using roxygen2 and devtools. I have added a function that uses %>% and mutate in the @examples section. When I run check() it fails, because it cannot find the function %>% or mutate.

基于此，此和此我尝试了以下操作：

Based on this, this, and this I have tried the following:

我有＃'importFrom magrittr％>％和＃'importFrom dplyr mutate 在函数的 .R 文件中。我还在 Imports：下的 magrittr 和 dplyr DESCRIPTION 文件。运行 document（）之后，我的 NAMESPACE 文件包含 importFrom（dplyr，mutate）和 importFrom（magrittr，％>％）。

I have #' importFrom magrittr %>% and #' importFrom dplyr mutate in the function's .R file. I also have magrittr and dplyr under Imports: in the DESCRIPTION file. After running document(), my NAMESPACE file contains importFrom(dplyr,mutate) and importFrom(magrittr,"%>%").

最小 R / test.R 文件：

#' Conditional mutate
#'
#' \code{mutate_cond} mutates the \code{data.frame} only on the rows that
#' satisfy the condition.
#' 
#' @param .data \code{data.frame}
#' @param condition expression with the condition to be evaluated
#' @param ... arguments passed to \code{mutate}
#' @param envir environment inherited from \code{parent.frame()}
#'
#' @return \code{data.frame}
#' @importFrom dplyr mutate
#' @importFrom magrittr %>%
#'
#' @examples
#' data(iris)
#' iris %>%
#'    mutate(aux = 0) %>%
#'    mutate_cond(Petal.Length > 1.3,aux = 3)
#'
#' @export
mutate_cond <- function(.data, condition, ..., envir = parent.frame()) {
  condition <- eval(substitute(condition), .data, envir)
  .data[condition, ] <- .data[condition, ] %>% mutate(...)
  .data
}

最小 DESCRIPTION 文件：

Package: test
Version: 0.1
Date: 2019-06-07
Title: Functions
Description: Some functions I use.
Author: me
Maintainer: me <[e-mail]>
Encoding: UTF-8
License: GPL-3
Imports: dplyr, magrittr

NAMESPACE 用 document（）生成：

# Generated by roxygen2: do not edit by hand

export(mutate_cond)
importFrom(dplyr,mutate)
importFrom(magrittr,"%>%")

我希望此示例代码能够成功运行并传递 check（）。相反，我收到此错误消息：

I expect this example code to run successfully and pass check(). Instead I get this error message:

❯ checking examples ... ERROR
  Running examples in ‘test-Ex.R’ failed
  The error most likely occurred in:

  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: mutate_cond
  > ### Title: Conditional mutate
  > ### Aliases: mutate_cond
  > 
  > ### ** Examples
  > 
  > data(iris)
  > iris %>%
  +    mutate(aux = 0) %>%
  +    mutate_cond(Petal.Length > 1.3,aux = 3)
  Error in iris %>% mutate(aux = 0) %>% mutate_cond(Petal.Length > 1.3,  : 
    could not find function "%>%"
  Execution halted

1 error ✖ | 0 warnings ✔ | 0 notes ✔

此外，如果我添加 require（dplyr）和 require（magrittr）到 @examples 部分，错误消失了，或者如果我删除了整个 @examples 部分，错误消失了。

Also, if I add require(dplyr) and require(magrittr) to the @examples section the error goes away or if I remove the whole @examples section the error goes away.

为什么不这样做打包通过 check（）？

Why won't this package pass check()?

谢谢！

推荐答案

在控制台中运行 usethis :: use_pipe（）也可以解决问题。

Running usethis::use_pipe() in the console will do the trick as well.

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