Calling data in ui.R saved in data-raw

[dilsherdhillon]

I'm trying to develop a simple app that takes in a pre-trained model(*.RDS), and given the input by user, outputs predictions. <30 lines of code.

I now want to package this up in an app, and eventually docker + shinyproxy.

My question is -
What path do I use to call the model in my ui.R file, if I keep my data in the data-raw folder?
This is what I'm using but when I run it, it says model_1 not found.

model_1 <- readRDS("data-raw/trained_model.rds")  

## the UI stuff below here

How do I ensure my relative path when reading in the model object in ui.R calls in the model?

[VincentGuyader]

Hi,

the data-raw folder will not be present in your builded package. you cant use it in your app.
a nice way to do what you need is to put your rds file inside the inst/extdata folder and to use :

readRDS(system.file("extdata","plop.rds",package = "yourgolem")))

Regards

[ColinFay]

Just as any package the data-raw folder is ignored when build, so you can't refer to data from there.

As far as I see it if you need something accessible in your UI, you should:

• save your RDS as a data file in your package (http://r-pkgs.had.co.nz/data.html)
• in the with_golem_options, use golem_opts(mydata = mypkg::mydata) at https://github.com/ThinkR-open/golem/blob/master/inst/shinyexample/R/run_app.R#L9
• in your UI function, use get_golem_options("mydata") to access your dataset.
  See https://github.com/ColinFay/golemexample/blob/master/README.md#passing-arguments-to-run_app

Does it do what you need? Let me know if you need a more detailed example

[dshelldhillon]

Hi Vincent and Colin -
Thank you for your help and sorry for the late reply. I've been out and will give this a try and close the issue.
Once again, thanks a ton!!

Dilsher

[ColinFay]

Ok so I thought this through and realized it's way easier than that with the way {golem} is implemented.

You just have to:

• Register your dataset as a package data (follow http://r-pkgs.had.co.nz/data.html) :
  https://github.com/ColinFay/golemexample/blob/master/data-raw/dataset.R#L6 which is turned into https://github.com/ColinFay/golemexample/blob/master/data/plop.rda

• Use your data object wherever you need it (in your UI or server)
  https://github.com/ColinFay/golemexample/blob/master/R/mod_my_fourth_module.R#L21 and https://github.com/ColinFay/golemexample/blob/master/R/mod_my_fourth_module.R#L36

[ColinFay]

hi @dilsherdhillon

Have you worked on that? Do you need any more info?

Don't hesitate to close the issue if everything is ok :)

[dshelldhillon]

Sorry! Yes it worked - thank you so much for this package!

[ajmoralesa]

Ok so I thought this through and realized it's way easier than that with the way {golem} is implemented.

You just have to:

• Register your dataset as a package data (follow http://r-pkgs.had.co.nz/data.html) :
  https://github.com/ColinFay/golemexample/blob/master/data-raw/dataset.R#L6 which is turned into https://github.com/ColinFay/golemexample/blob/master/data/plop.rda

• Use your data object wherever you need it (in your UI or server)
  https://github.com/ColinFay/golemexample/blob/master/R/mod_my_fourth_module.R#L21 and https://github.com/ColinFay/golemexample/blob/master/R/mod_my_fourth_module.R#L36

@ColinFay I'm having troubles with this in a dockerized golem app. Everything works well when I install or test locally the app, but when running a docker container, I keep having:

Listening on http://0.0.0.0:3838
Warning: Error in get: object 'db_coord' not found
  [No stack trace available]

As suggested here, I called explicitly the data set using mypackage::mydataset, but the error remains. I also tested your suggestions but did not resolve the issue either.

Do you have any idea of what can be happening? Many thanks in advance!

[ajmoralesa]

I guess my issue is related to #413 and more specifically #321