dm_pack_tbl()

dm_pack_tbl() converts a parent table to a packed column in its child table. The parent table should not have parent tables itself (i.e. it needs to be a terminal parent table).

Usage

dm_pack_tbl(dm, parent_table, into = NULL)

Arguments

dm

A dm.

parent_table

A terminal table with one child table.

into

The table to pack parent_tables into, optional as it can be guessed from the foreign keys unambiguously but useful to be explicit.

See also

dm_wrap_tbl(), dm_unwrap_tbl(), dm_nest_tbl().

Examples

dm_packed <-
  dm_nycflights13() %>%
  dm_pack_tbl(planes)

dm_packed
#> ── Metadata ────────────────────────────────────────────────────────────────────
#> Tables: `airlines`, `airports`, `flights`, `weather`
#> Columns: 45
#> Primary keys: 3
#> Foreign keys: 3

dm_packed$flights
#> # A tibble: 1,761 × 20
#>     year month   day dep_time sched_de…¹ dep_d…² arr_t…³ sched…⁴ arr_d…⁵ carrier
#>    <int> <int> <int>    <int>      <int>   <dbl>   <int>   <int>   <dbl> <chr>  
#>  1  2013     1    10        3       2359       4     426     437     -11 B6     
#>  2  2013     1    10       16       2359      17     447     444       3 B6     
#>  3  2013     1    10      450        500     -10     634     648     -14 US     
#>  4  2013     1    10      520        525      -5     813     820      -7 UA     
#>  5  2013     1    10      530        530       0     824     829      -5 UA     
#>  6  2013     1    10      531        540      -9     832     850     -18 AA     
#>  7  2013     1    10      535        540      -5    1015    1017      -2 B6     
#>  8  2013     1    10      546        600     -14     645     709     -24 B6     
#>  9  2013     1    10      549        600     -11     652     724     -32 EV     
#> 10  2013     1    10      550        600     -10     649     703     -14 US     
#> # … with 1,751 more rows, 10 more variables: flight <int>, tailnum <chr>,
#> #   origin <chr>, dest <chr>, air_time <dbl>, distance <dbl>, hour <dbl>,
#> #   minute <dbl>, time_hour <dttm>, planes <packed[,8]>, and abbreviated
#> #   variable names ¹​sched_dep_time, ²​dep_delay, ³​arr_time, ⁴​sched_arr_time,
#> #   ⁵​arr_delay

dm_packed$flights$planes
#> # A tibble: 1,761 × 8
#>     year type                    manufacturer   model engines seats speed engine
#>    <int> <chr>                   <chr>          <chr>   <int> <int> <int> <chr> 
#>  1  2003 Fixed wing multi engine AIRBUS         A320…       2   200    NA Turbo…
#>  2  2003 Fixed wing multi engine AIRBUS         A320…       2   200    NA Turbo…
#>  3  2001 Fixed wing multi engine AIRBUS INDUST… A321…       2   199    NA Turbo…
#>  4  2000 Fixed wing multi engine BOEING         737-…       2   149    NA Turbo…
#>  5  1998 Fixed wing multi engine AIRBUS INDUST… A319…       2   179    NA Turbo…
#>  6    NA NA                      NA             NA         NA    NA    NA NA    
#>  7  2011 Fixed wing multi engine AIRBUS         A320…       2   200    NA Turbo…
#>  8  2011 Fixed wing multi engine EMBRAER        ERJ …       2    20    NA Turbo…
#>  9  2002 Fixed wing multi engine EMBRAER        EMB-…       2    55    NA Turbo…
#> 10  2000 Fixed wing multi engine AIRBUS INDUST… A319…       2   179    NA Turbo…
#> # … with 1,751 more rows