如何解决当目标包中缺少文件时触发代码
options(Crayon.enabled = FALSE,tidyverse.quiet = TRUE)
library(targets)
library(tidyverse)
write_csv(tibble(x1 = 1,x2 = 1),"a.csv")
write_csv(tibble(x1 = 1,"b.csv")
tar_script({
options(Crayon.enabled = FALSE,tidyverse.quiet = TRUE)
library(readr)
list(
tarchetypes::tar_files(paths,c("a.csv","b.csv")),tar_target(data,read_csv(paths,col_types = "dd"),pattern = map(paths))
)
})
tar_make()
#> ● run target paths_files
#> ● run branch paths_5c47d23d
#> ● run branch paths_63f6955e
#> ● run branch data_ecdaefee
#> ● run branch data_34ea7b1c
#> ● end pipeline
这适用于下游效果,即如果我修改 b.csv
,那么下游的相应分支 (data
) 会再次运行。但是,我将如何创建一个向上游传播的目标(即,如果 b.csv
缺失,那么我希望运行一个规则来重新创建它)。
谢谢,
解决方法
在这种情况下,管道中的目标应创建文件。草图:
# _targets.R file:
library(readr)
library(targets)
library(tibble)
options(crayon.enabled = FALSE,tidyverse.quiet = TRUE)
helper <- function(path) {
write_csv(tibble(x1 = 1,x2 = 1),path) # 1. Write the file.
path # 2. Return the path.
}
list(
tar_target(paths,c("a.csv","b.csv")),tar_target(files,helper(paths),pattern = map(paths),format = "file"),tar_target(data,read_csv(paths,col_types = cols()),pattern = map(files))
)
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