[general] Cannot have a target in the tar_render(output_file) argument

[billdenney]

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Description

I am making a large set of reports where they need to go into different directories. I wanted to make the directory set into a target that I can change as I change the targets. But, the output_file argument of tar_render() appears to be evaluated in the original R session and not with the target values available. Is there a way around this?

targets::tar_script({
  library(targets)
  library(tarchetypes)
  writeLines(con = "template.Rmd", text = "")
  tar_plan(
    path_element = "foo",
    tar_render(
      report,
      "template.Rmd",
      output_file = file.path("/tmp", path_element, "/bar.pdf")
    )
  )
})
targets::tar_make()

[wlandau]

Sorry, the output_file argument does need to be rendered before static code analysis happens (to determine if the command changes) before even beginning to run the pipeline.

[billdenney]

Thanks for the quick reply. I can use a fixed parameter and then do some added testing to ensure that it's set correctly.