Pass param to .qmd in quarto_render

[adpadi]

Using RStudio, I am trying to pass a parameter to my quarto script and run from a separate script and/or from command line. This worked well in rmarkown using the render and params argument, but argument is not found by the quarto script.

I get the following error message:

Quitting from lines 32-83 (report_template.qmd)
Error in eval(expr, envir, enclos) : object 's' not found

My approach is:

Report_dir<-'C:\\Users\\folder'
scripts<-'C:\\Users\\scripts'
sites = c('site-1', 'site-2')
overwrite=FALSE

for(s in sites){
  report_filename<-file.path(Report_dir, paste0(s, ".docx"))
  #check to see if report is already done
  if (overwrite == FALSE & file.exists(report_filename)){
    next
    } else{
      quarto_render(input = file.path(scripts, "report_template.qmd"),
         output_file=report_filename,
         execute_params=list(site=s))  # is execute_params correct?
}
}

Based on the quarto documentation, it appears I need to place the params argument in the YAML, which I tried (although this seemed to be more geared toward Jupyter). I also tried running the quarto file from command line and passing the parameter that way.
quarto render "C:\Users\folder\report_template.qmd" -P site:'site-1'

[mcanouil]

The issue seems to be in your quarto document rather than the way you are using parameters.

You can try the following small example:

• qmd:

  ---
  title: "My Document"
  params:
    alpha: 0.1
    ratio: 0.1
  ---
  
  # This is alpha = `r params$alpha`
  
  ratio = `r params$ratio`.
  

• r:

  quarto::quarto_render(
    input = "gur.qmd",
    execute_params = list(ratio = 2)
  )

[adpadi]

This was helpful. I simply wasn't accessing the parameter using the param$alpha syntax. In Rmarkdown (and e.g. python file from command line) the parameter is simply passed and included as variable. Whereas here, it's stored in the param list, which makes sense, I just didn't notice it was done this way.