[R-pkg-devel] Note: no function found corresponding to methods exports for show

[Mikael Jagan]

> Hi,
> 
> I recently submitted my first R package to CRAN, and I encountered a NOTE
> during the checking process. The NOTE looks like this:
> 
> =============================================================
> Flavor: r-devel-linux-x86_64-debian-gcc, r-devel-windows-x86_64
> Check: whether the namespace can be loaded with stated dependencies,
> Result: NOTE
>    Warning: no function found corresponding to methods exports from 'hmsr'
> for: 'show'
> 
>    A namespace must be able to be loaded with just the base namespace
>    loaded: otherwise if the namespace gets loaded by a saved object, the
>    session will be unable to start.
> 
>    Probably some imports need to be declared in the NAMESPACE file.

Sounds like your NAMESPACE is missing importFrom(methods, show) ... ?
I'm not sure why you could not reproduce the problem locally, given that
check uses _R_CHECK_CODE_USAGE_WITH_ONLY_BASE_ATTACHED_=true by default.
But it is hard to say anything without a link to the package sources ...

Mikael

> =============================================================
> 
> I'm seeking help to understand and address this issue. show is defined like
> this:
> 
> #' Show method for class "hms".#'#' @param object - hms s4 object#'#'
> @return It returns the names of the slots and the classes associated
> with the#' slots in the "hms" class. It prints call details.#'#'
> @export#'#' @examples
> #' f <- function(x) x
> #' result <- hms(fitness = f, lower = -5, upper = 5)
> #' show(result)
> setMethod("show", "hms", function(object) {
>    cat("An object of class \"hms\"\n")
>    cat("\nCall:\n", deparse(object using call), "\n\n", sep = "")
>    cat("Available slots:\n")
>    print(methods::slotNames(object))})
> 
> And in the NAMESPACE there is a line that looks like this:
> 
> exportMethods(show)
> 
> I was investigating if the show is defined correctly and the GA package has
> a very similar method:
> 
> setMethod("show", "ga",function(object)
>   { cat("An object of class \"ga\"\n")
>     cat("\nCall:\n", deparse(object using call), "\n\n",sep="")
>     cat("Available slots:\n")
>     print(slotNames(object))})
> 
> I could not reproduce this NOTE on my personal machine with Windows.
> On Mac OS I have never experienced this NOTE.
> 
> 
> Best regards
> 
> Wojciech Achtelik