tests/testthat/_snaps/join.md

In mongolmaps: Maps and Administrative Boundaries of Mongolia and Ulaanbaatar

mn_join() joins NSO codes at the aimag level and drops other levels

Code
  out <- mn_join(pop, by = "Region", level = "aimag")
Message
  i Joining at the aimag level; dropped 6 rows for larger units ("country" and "region") and 2196 rows for smaller units ("soum" and "bag").

mn_join() detects the level and joins khoroos

Code
  out <- mn_join(pop, Region, within = "Ulaanbaatar")
Message
  i Joining at the bag level; dropped 371 rows for larger units ("country", "region", "aimag", and "soum").

mn_join() reports unmatched rows and places without boundaries

Code
  out <- mn_join(df, "place", level = "aimag")
Condition
  Warning:
  1 value could not be matched and became "NA":
  * Narnia

Code
  out <- mn_join(villages, "code", level = "soum")
Message
  i 1 matched place has no boundary and is left out:
  * Khatgal (MN6770, Khuvsgul)
  i Villages and rural bags have NSO codes but no public boundary; see `?mongolmaps::mn_bags()`.

mn_join() validates its inputs

Code
  mn_join(list(a = 1), "a")
Condition
  Error in `mn_join()`:
  ! `data` must be a data frame, not a list.

Code
  mn_join(pop, "Province")
Condition
  Error in `mn_join()`:
  ! Column Province is not in `data`.

Code
  mn_join(pop, "Region", by_parent = "Aimag")
Condition
  Error in `mn_join()`:
  ! Column Aimag is not in `data`.

mn_join() checks by_parent is a single string

Code
  mn_join(pop, "Region", by_parent = 1)
Condition
  Error in `mn_join()`:
  ! `by_parent` must be a single string.

mongolmaps documentation built on Oct. 10, 2026, 5:08 p.m.