Help needed: generating downloadable reports in golem

[YonghuiDong]

Hi developers,

I want to generate a downloadable HTML reports with golem. What I want to do is to included some generated tables and figures in the report.

These tables and figures are produced in different shiny modules. How can I include them in params, should I convert them into global variables?

Below is my minimal example. n is an output from the same module, and It works. When I add the second param barplot() from another module (the module is not shown here), it pops up an error: Error in barplot: could not find function "barplot"

I know transform them into global variable should work. I am wondering if there is a suggested way under the golem framework?

Thanks a lot.

Dong

library(shiny)

# UI
choice_ui <- function(id) {
  ns <- NS(id)
  tagList(
    sliderInput(inputId = ns("slider"), 
                label = "Slider",  
                min = 1, 
                max = 100, 
                value = 50),
    downloadButton(outputId = ns("report_button"), 
                   label = "Generate report"
                   )
    )
}

# Server
choice_server <- function(id) {
  moduleServer(id, function(input, output, session){
    output$report_button<- downloadHandler(
      filename = "report.html",
      content = function(file) {
        tempReport <- file.path(tempdir(), "myRport.Rmd")
        file.copy("www/myReport.Rmd", tempReport, overwrite = TRUE)
        params <- list(n = input$slider,
                       mybar = barplot() # from another module
                        )
        rmarkdown::render(tempReport, output_file = file,
                          params = params,
                          envir = new.env(parent = globalenv())
                          )
        }
      )
    }
  )
}

# Application
library(shiny)
app_ui <- function() {
  fluidPage(
    choice_ui("choice_ui_1")
  )
}

app_server <- function(input, output, session) {
  r <- reactiveValues()
  choice_server("choice_ui_1")
}

shinyApp(app_ui, app_server)

[ColinFay]

Hey,

You need to specify the correct path for the Rmd in your file.copy, to do that you can use the app_sys() wrapper located in app_config.

For your example, it should be app_sys("app/www/myReport.Rmd")

[YonghuiDong]

Thanks a lot @ColinFay. Can I use file.copy("inst/app/www/myReport.Rmd", tempReport, overwrite = TRUE) in the server file instead of setting app_sys() in the app_config() file?

My another question is should I convert the tables and figures generated from other modules as global variable so as to include them in the report? or is there another recommended way?

Dong