expand var_group() using the var name instead of numbers

[matthiasgomolka]

Hi Mark,

using var_group() in the definition of validation rules is super helpful, thanks! Here is a tiny suggestion for making it even better. This is the current state:

library(validate)

df <- data.frame(A = 0L:1L,
                 B = 1L:2L)
vl <- validator(var_group(A, B) > 0L)
cf <- confront(df, vl)
summary(cf)
#>   name items passes fails nNA error warning expression
#> 1 V1.1     2      1     1   0 FALSE   FALSE     A > 0L
#> 2 V1.2     2      2     0   0 FALSE   FALSE     B > 0L

^{Created on 2020-01-31 by the reprex package (v0.3.0)}

Session info

devtools::session_info()
#> - Session info ---------------------------------------------------------------
#>  setting  value                       
#>  version  R version 3.6.1 (2019-07-05)
#>  os       Windows 10 x64              
#>  system   x86_64, mingw32             
#>  ui       RTerm                       
#>  language (EN)                        
#>  collate  German_Germany.1252         
#>  ctype    German_Germany.1252         
#>  tz       Europe/Berlin               
#>  date     2020-01-31                  
#> 
#> - Packages -------------------------------------------------------------------
#>  package     * version date       lib source        
#>  assertthat    0.2.1   2019-03-21 [1] CRAN (R 3.5.3)
#>  backports     1.1.5   2019-10-02 [1] CRAN (R 3.5.3)
#>  callr         3.3.2   2019-09-22 [1] CRAN (R 3.5.3)
#>  cli           1.1.0   2019-03-19 [1] CRAN (R 3.5.3)
#>  crayon        1.3.4   2017-09-16 [1] CRAN (R 3.5.3)
#>  desc          1.2.0   2018-05-01 [1] CRAN (R 3.5.3)
#>  devtools      2.0.2   2019-04-08 [1] CRAN (R 3.5.3)
#>  digest        0.6.22  2019-10-21 [1] CRAN (R 3.5.3)
#>  evaluate      0.14    2019-05-28 [1] CRAN (R 3.5.3)
#>  fs            1.3.1   2019-05-06 [1] CRAN (R 3.5.3)
#>  glue          1.3.1   2019-03-12 [1] CRAN (R 3.5.3)
#>  highr         0.8     2019-03-20 [1] CRAN (R 3.5.3)
#>  htmltools     0.4.0   2019-10-04 [1] CRAN (R 3.5.3)
#>  knitr         1.26    2019-11-12 [1] CRAN (R 3.5.3)
#>  magrittr      1.5     2014-11-22 [1] CRAN (R 3.5.3)
#>  memoise       1.1.0   2017-04-21 [1] CRAN (R 3.5.3)
#>  pkgbuild      1.0.3   2019-03-20 [1] CRAN (R 3.5.3)
#>  pkgload       1.0.2   2018-10-29 [1] CRAN (R 3.5.3)
#>  prettyunits   1.0.2   2015-07-13 [1] CRAN (R 3.5.3)
#>  processx      3.4.1   2019-07-18 [1] CRAN (R 3.5.3)
#>  ps            1.3.0   2018-12-21 [1] CRAN (R 3.5.3)
#>  R6            2.4.1   2019-11-12 [1] CRAN (R 3.5.3)
#>  Rcpp          1.0.3   2019-11-08 [1] CRAN (R 3.6.2)
#>  remotes       2.0.4   2019-04-10 [1] CRAN (R 3.5.3)
#>  rlang         0.4.2   2019-11-23 [1] CRAN (R 3.5.3)
#>  rmarkdown     2.1     2020-01-20 [1] CRAN (R 3.6.2)
#>  rprojroot     1.3-2   2018-01-03 [1] CRAN (R 3.5.3)
#>  sessioninfo   1.1.1   2018-11-05 [1] CRAN (R 3.5.3)
#>  settings      0.2.4   2015-10-27 [1] CRAN (R 3.5.1)
#>  stringi       1.4.3   2019-03-12 [1] CRAN (R 3.5.3)
#>  stringr       1.4.0   2019-02-10 [1] CRAN (R 3.5.3)
#>  testthat      2.2.1   2019-07-25 [1] CRAN (R 3.5.3)
#>  usethis       1.5.0   2019-04-07 [1] CRAN (R 3.5.3)
#>  validate    * 0.2.6   2018-08-01 [1] CRAN (R 3.5.1)
#>  withr         2.1.2   2018-03-15 [1] CRAN (R 3.5.3)
#>  xfun          0.11    2019-11-12 [1] CRAN (R 3.5.3)
#>  yaml          2.2.0   2018-07-25 [1] CRAN (R 3.5.3)
#> 
#> [1] C:/Program Files/R/library

Ideally (from my perspective), the name column of summary(cf) would use the variable names from var_group() to expand to V1.A and V1.B. What do you think?

[markvanderloo]

That's a nice idea, thanks!