从 linux 系统上的 R shiny downloadHandler 中删除目录结构

Question

I'd like to know if it's possible to remove the tmp folder directory structure from the download file name of my shiny app, and if yes, how please. My shiny app uses tempfile() to generate a filename in the tempdir() with the initial part of the name given by an input (fieldName_f). This works fine on my Windows computer, eg if input$fieldName_f <- 'Paddock1', the filename in the popup window displayed 'Paddock1Report420239b17634.html'. However, when the codes run on the linux server where my app is hosted, the tmp directory will be appended before my input name, eg the output filename will be '_tmp_Rtmp53xNDh_Paddock1Report420239b17634.html', which is undesireable.

I'm wondering if there is a way to set eg a junk path to ensure that the folder structure does not get saved in the filename in the downloadHandler please.

Thanks heaps!

  frmd <- tempfile('report', tmpdir = tempdir(), fileext = '.Rmd') 
  output$downloadF <- downloadHandler(
    #specify a filename to save
    filename = function(){
      tempfile(paste0(input$fieldName_f, 'Report'), tmpdir = tempdir(), fileext = '.html')},    
    content = function(file){
      # Copy the template r markdown file to a temporary directory before processing it
      file.copy('reportF.Rmd', frmd, overwrite = T)
      rmarkdown::render(frmd, output_file = file)
    }
  )

Answer 1

I think that filename should simply be the filename that the user receives. This should be a string. Try

filename = function(){
    paste0(input$fieldName_f, ' Report')}

Note that I also added a space before the word "Report", which is probably what you want.