Hi, yet another workaround is to create the active binding in the .onLoad() function. Here is an example from the cli package: https://github.com/r-lib/cli/blob/d4756c483f69c2382c27b0b983d0ce7cc7e63763/R/onload.R#L8
Gabor On Sat, Mar 23, 2019 at 3:50 PM Jack O. Wasey <j...@jackwasey.com> wrote: > > Dear all, > > I am developing a package which is a front for various online data > (icd.data https://github.com/jackwasey/icd.data/ ). The current CRAN > version just has lazy-loaded data, but now the package encompasses far > more current and historic ICD codes from different countries, these > can't be included in the CRAN package even with maximal compression. > > Other authors have solved this using functions to get the data, with or > without a local cache of the retrieved data. No CRAN or other packages I > have found after extensive searching use the attractive active binding > feature of R. > > The goal is simple: for the user to refer to the data by its symbol, > e.g., 'icd10fr2019', or 'icd.data::icd10fr2019', and it will be > downloaded and parsed transparently (if the user has already granted > permission, or after prompt if they haven't). > > The bindings are set using commands alongside the function definitions > in R/*.R .E.g. > > makeActiveBinding("icd10cm_latest", .icd10cm_latest_binding, environment()) > lockBinding("icd10cm_latest", environment()) > > For non-interactive use, CI and CRAN tests, no data should be > downloaded, and no cache directory set up without user consent. For > interactive use, I ask permission to create a local data cache before > downloading data. > > This works fine... until R CMD check. The following steps seems to 'get' > or 'source' everything from the package namespace, which results in > triggering the active bindings, and this fails if I am unable to get > consent to download data, and want to 'stop' on this error condition. > - checking dependencies in R code > - checking S3 generic/method consistency > - checking foreign function calls > - checking R code for possible problems > > Debugging CI-specific binding bugs is a nightmare because these occur in > different R sessions initiated by R CMD check. > > There may be legitimate reasons to evaluate everything in the namespace, > but I've no idea what they are. Incidentally, Rstudio also does 'mget' > on the whole package namespace and triggers bindings during > autocomplete. https://github.com/rstudio/rstudio/issues/4414 > > Is this something I should raise as an issue with R? Or does anyone have > any idea of a sensible approach to this. Currently I have a set of > workarounds, but this complicates the code, and has taken an awful lot > of time. Does anyone know of any CRAN package which has active bindings > in the package namespace? > > Any ideas appreciated. > > Jack Wasey > > ______________________________________________ > R-package-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-package-devel ______________________________________________ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
