Generate unique row IDs for output rows — generate_row

Creates a character ID for each row by combining the layer index and row label values. These IDs can be used with tplyr_meta_result() and tplyr_meta_subset() to look up cell metadata.

Usage

generate_row_ids(result)

Arguments

result: A data.frame produced by tplyr_build()

Value

Character vector of row IDs (same length as nrow(result))

Examples

spec <- tplyr_spec(
  cols = "TRT01P",
  layers = tplyr_layers(group_count("AGEGR1"))
)
built <- tplyr_build(spec, tplyr_adsl)
generate_row_ids(built)
#> [1] "1_<65"   "1_65-80" "1_>80"  

# IDs are derived from the row labels, so generate them from an unmodified
# build. tplyr_build(metadata = TRUE) attaches a row_id column that survives
# post-processing, which is the safer route.
with_meta <- tplyr_build(spec, tplyr_adsl, metadata = TRUE)
with_meta$row_id
#> [1] "1_<65"   "1_65-80" "1_>80"