I am building a package for internal use using devtools. I would like to have the package load in data from a file/connection (that differs depending on the date package is built). The data is large-ish so having a onetime cost of parsing and loading the data during package building is preferable.

Currently, I have a data.R file under R/ that assigns the data to package-level variables, the values are assigned during package installation (or at least that's what appears to be happening). This less than ideal setup mostly works. In order to get all instances of the package to have the same data I have to distribute the data file with the package (currently it's being copied to inst/ by a helper script before building the package) instead of just having it all be packaged together. There must be a better way.

Such as:

  • Generate .rda files during package building (but this requires not running the same code during package install)
    • I can do this with a Makefile but that seems like overkill
    • Can I have R code that is only run during package building and not during install?
  • Run R code in data/
    • But the data is munged using code in the package in question. I can fix that with Collate (I think) but then I have to maintain the order of all of the .R files (but with that added complexity I might as well use a Makefile?)
  • Build two packages, one with all of the code I want, one with the data.
  • Obvious, clever things I've not thought of.

tl;dr: What are some methods for adding a snapshot of dynamically changing data to an R package frozen for deployment?

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