H30 Publish a correction

Use your current course session. Preparation and course runner · R script ↓

H30 Publish a correction

Goal: Name the expected previous release.

Prerequisites: H29.

previous protects a correction against an unexpectedly changed starting release.

training_step(
  "H30",
  {
    lake_correction_data <- lake_second_data
    lake_correction_data$premium[1] <- 105
    lake_corrected <- dr_publish(
      lake_product,
      data = lake_correction_data,
      previous = lake_second,
      business_date = "2026-08-31"
    )
    print(dataraft.lake::dr_compare(
      lake_second,
      lake_corrected,
      key = "policy_id"
    ))
    stopifnot(
      sum(dr_collect(lake_first)$premium) == 740,
      sum(dr_collect(lake_corrected)$premium) == 745
    )
  },
  needs = c("H29"),
  enabled = training_options$lake,
  optional = TRUE
)

Expected result: The correction totals 745; the first version remains 740.

Task: Does a correction overwrite a historical release?