Reactivity is now broken with data.table

[raubreywhite]

This has been brought up in data.table as well (https://github.com/Rdatatable/data.table/issues/2001)

These examples all use this framework: http://rmarkdown.rstudio.com/flexdashboard/

So you need to rename "failingFlexdashboard.txt" to "failingFlexdashboard.Rmd" and then you can run it (the same with "workingFlexdashboard.txt" -> "workingFlexdashboard.Rmd").

I've also attached the log from my shiny server that gives the error.

Basically, when the reactive data contains a data.table instance, it fails. When the reactive data contains a data.frame instance, it works.

test_error-docker-20170508-120846-37265 (linux's conflicted copy 2017-05-08) (linux's conflicted copy 2017-05-08) copy.txt failingFlexdashboard.txt workingFlexdashboard.txt Basically, Shiny seems to be trying to treat it as a data.frame, not a data.table, so it can't find the variable to stratify on.

[wch]

It works in a normal Shiny app, so this is probably specific to Shiny + Rmd documents:

library(data.table)
library(shiny)

shinyApp(
  ui = fluidPage(
    tableOutput("tbl")
  ),
  server = function(input, output) {
    getData <- reactive({
      data <- data.table(x=1:10,y=1:10)
      data[x==1]
    })

    output$tbl <- renderTable({
      getData()
    })

  }
)

[raubreywhite]

Interesting... Do you have any suggestions on where I should repost it? flexdashboard, probably?

[wch]

Here's a a simplified Rmd example that gives the same error, object 'x' not found:

---
title: "data.table test"
runtime: shiny
---

```{r}
library(data.table)
library(shiny)

getData <- reactive({
  data <- data.table(x=1:10, y=1:10)
  data[x==1]
})
```

```{r}
renderTable(getData())
```

```{r}
renderPrint({
  str(getData())
})
```

```{r}
# This works OK
data2 <- data.table(x=1:10, y=1:10)
data2[x==1]
```

I think there's probably some issue with the non-standard evaluation of the code in the reactive. For some reason it happens only with a Shiny doc, but not in a regular Shiny app.

[mattdowle]

Thanks for reporting. Should be resolved now. Please test and close. https://github.com/Rdatatable/data.table/wiki/Installation#install-datatable-development-version

[wch]

Looks like it works!