Trouble understanding check_key()

[defuneste]

I had some trouble understanding check_key() when the columns provided is a valid unique key.

If the columns given in the ellipsis ARE a key, the data frame itself is returned silently, so that it can be used for piping.

Small example:

dat <- tibble(a = c(1, 2, 3), b = c(5, 5, 6), c = c(7, 8, 9))
(check_key(dat, a))
NULL

Should dat be returned instead of NULL or should the documentation be modified?

[krlmlr]

Thanks, this is clearly a mismatch between behavior and documentation. I remember this working before, can we find out with what version this worked the last time?

options(conflicts.policy = list(warn = FALSE))
library(dm)

dat <- tibble(a = c(1, 2, 3), b = c(5, 5, 6), c = c(7, 8, 9))
out <- check_key(dat, a)
out
#> NULL

^{Created on 2024-11-24 with reprex v2.1.1}