RStudio Connections preview

[ehellas]

Hello, I am trying to make an extra add-in to SAS Viya inside R Studio ide through the connections.
Everything kinda works except the part that I can't click on a table to preview it.

I am following everything on Connections contracts as stated in the docs

(Connections Contract)

but I can't preview a table whatsoever, even though I can see all of it's table values (but not an small icon in the right side, to preview it).

I was wondering if It could be something with the function I put inside of previewObject (the output for this part is a data.frame) or maybe listObjectTypes but doesn't seems to be.

Any ideia what could it be?

[jonathan]

Does your listObjectTypes indicate that these object types contain data?

https://db.rstudio.com/advanced/contract/#hierarchy

The contains member is either a list of object types that the object contains, or the special value "data" if the object contains data.

[ehellas]

Yes, they do!
The basic structure. For a while I thought that this was the problem, but doesn't seem to fit.

how listObject types is defined:

observer$connectionOpened( [...],

                listObjectTypes = function() {
                    casListObjectTypes()
                },
[...])

casListObjectTypes <- function() {
    list(caslib = 
             list(contains = 
                      list(castable = 
                               list(contains = "data"))))
}

The structure seems correct.
I've also tried to adding icon but to no success.

[rushabh92]

You can try to update your connection and see if you got any success.

If the list of objects in your data source changes while the connection is open, your R package can tell RStudio to refresh the Connections Pane to show the new information. This is done by invoking the connectionUpdated() method as follows:

observer <- getOption("connectionObserver")
if (!is.null(observer))
  observer$connectionUpdated(type, host)

The RStudio Connections Pane can display database-like connections from any R package which implements a connections contract.

[ehellas]

Indeed I hadn't added that to my code before. (connectionUpdated)
I've tried it this way:

on_connection_updated <- function(hostname, hint) {
  # make sure we have an observer
  observer <- getOption("connectionObserver")
  if (!is.null(observer))
  
  observer$connectionUpdated(type = "Viya", 
                             host = hostname, 
                             hint = hint)
}

I didn't see any change, no bugs, auto refreshing nor what I want, which is the preview table.
I still think it is something on the previewObject() part, but I can't figure out whatsoever since its otuput is supposed to have is a data.frame so, no reason not to a have a preview.

I am really confused