dm_rm_fk() can remove either one reference between two tables, or multiple references at once (with a message). An error is thrown if no matching foreign key is found.

dm_rm_fk(
  dm,
  table = NULL,
  columns = NULL,
  ref_table = NULL,
  ref_columns = NULL,
  ...
)

Arguments

dm

A dm object.

table

A table in the dm. Pass NULL to remove all matching keys.

columns

Table columns, unquoted. To refer to a compound key, use c(col1, col2). Pass NULL (the default) to remove all matching keys.

ref_table

The table referenced by the table argument. Pass NULL to remove all matching keys.

ref_columns

The columns of table that should no longer be referencing the primary key of ref_table. To refer to a compound key, use c(col1, col2).

...

These dots are for future extensions and must be empty.

Value

An updated dm without the matching foreign key relation(s).

See also

Other foreign key functions: dm_add_fk(), dm_enum_fk_candidates(), dm_get_all_fks()

Examples

dm_nycflights13(cycle = TRUE) %>%
  dm_rm_fk(flights, dest, airports) %>%
  dm_draw()
%0

airlinesairlinescarrierairportsairportsfaaflightsflightscarriertailnumoriginorigin, time_hourflights:carrier->airlines:carrierflights:origin->airports:faaplanesplanestailnumflights:tailnum->planes:tailnumweatherweatherorigin, time_hourflights:origin, time_hour->weather:origin, time_hour