Polymode changes from ESS-mode to Markdown-mode whenever I press enter

Question

When I am editing .Rmd file within a polymode chunk, the mode switches from ESS to Markdown mode whenever I press enter. However, it switches back to ess-mode whenver I save the file.

I will try to demonstrate this: C-hvmajor-modeEnter

major-mode is a variable defined in ‘C source code’.
Its value is ‘ess-r-mode’
Original value was fundamental-mode
Local in buffer hw5.Rmd[R]; global value is fundamental-mode

x <- runif(100)

I run this command with no problem but then I hit enter

```{r}
x <- runif(100)


```

C-hvmajor-modeEnter

major-mode is a variable defined in ‘C source code’.
Its value is ‘markdown-mode’
Original value was fundamental-mode
Local in buffer hw5.Rmd; global value is fundamental-mode

Obviously, I have now lost the ess functionality until I save the file.

C-xC-s

Now it is back to ess-mode. C-hvmajor-modeEnter

major-mode is a variable defined in ‘C source code’.
Its value is ‘ess-r-mode’
Original value was fundamental-mode
Local in buffer hw5.Rmd[R]; global value is fundamental-mode

Answer 1

The reason I was having this problem is that I didn't have (require 'poly-R) in my init file. I only had (require 'poly-markdown). After adding (require 'poly-R), I can now press Enter within a chunk and it will stay in ess-r-mode.