pins 1.0.0 introduced a completely new API. While the legacy API will continue to be supported for some time, it will not gain any new features, so it’s good to plan to switch to the new interface. This vignette shows a couple of examples of updating legacy code to the modern API, then provides a full set of equivalences between the legacy and modern function names.

Examples

A simple example of the legacy API looks something like this:

# Legacy API
board_register_local("vignette", tempfile())

pin(head(mtcars), "mtcars", board = "vignette")
pin_get("mtcars", board = "vignette")
#>                    mpg cyl disp  hp drat    wt  qsec vs am gear carb
#> Mazda RX4         21.0   6  160 110 3.90 2.620 16.46  0  1    4    4
#> Mazda RX4 Wag     21.0   6  160 110 3.90 2.875 17.02  0  1    4    4
#> Datsun 710        22.8   4  108  93 3.85 2.320 18.61  1  1    4    1
#> Hornet 4 Drive    21.4   6  258 110 3.08 3.215 19.44  1  0    3    1
#> Hornet Sportabout 18.7   8  360 175 3.15 3.440 17.02  0  0    3    2
#> Valiant           18.1   6  225 105 2.76 3.460 20.22  1  0    3    1

To convert to the modern API you need to make two major changes:

# Modern API
board <- board_local()

pin_write(board, head(mtcars), "mtcars")
#> Guessing `type = 'rds'`
#> Creating new version '20211004T114937Z-3e025'
#> Writing to pin 'mtcars'
pin_read(board, "mtcars")
#>                    mpg cyl disp  hp drat    wt  qsec vs am gear carb
#> Mazda RX4         21.0   6  160 110 3.90 2.620 16.46  0  1    4    4
#> Mazda RX4 Wag     21.0   6  160 110 3.90 2.875 17.02  0  1    4    4
#> Datsun 710        22.8   4  108  93 3.85 2.320 18.61  1  1    4    1
#> Hornet 4 Drive    21.4   6  258 110 3.08 3.215 19.44  1  0    3    1
#> Hornet Sportabout 18.7   8  360 175 3.15 3.440 17.02  0  0    3    2
#> Valiant           18.1   6  225 105 2.76 3.460 20.22  1  0    3    1

Since the board object is always the first argument, you might also want to use the pipe:

# Modern API
board <- board_local()

board %>% pin_write(head(mtcars), "mtcars")
#> Guessing `type = 'rds'`
#> Replacing version '20211004T114937Z-3e025' with '20211004T114937Z-3e025'
#> Writing to pin 'mtcars'
board %>% pin_read("mtcars")
#>                    mpg cyl disp  hp drat    wt  qsec vs am gear carb
#> Mazda RX4         21.0   6  160 110 3.90 2.620 16.46  0  1    4    4
#> Mazda RX4 Wag     21.0   6  160 110 3.90 2.875 17.02  0  1    4    4
#> Datsun 710        22.8   4  108  93 3.85 2.320 18.61  1  1    4    1
#> Hornet 4 Drive    21.4   6  258 110 3.08 3.215 19.44  1  0    3    1
#> Hornet Sportabout 18.7   8  360 175 3.15 3.440 17.02  0  0    3    2
#> Valiant           18.1   6  225 105 2.76 3.460 20.22  1  0    3    1

Pinning files

Another way to use pin() is with a path to a file:

# Legacy API
path <- tempfile()
writeLines(letters, path)

pin(path, "alphabet", board = "vignette")
pin_get("alphabet", board = "vignette")
#> [1] "/tmp/Rtmp91HlWm/file37702301989d/alphabet/file377043acfd3a"

pins 1.0.0 clearly separates the two cases of pin an object and pinning a file, so here instead of pin_write() and pin_read() you need to pin_upload() and pin_download():

# Modern API
board %>% pin_upload(path, "alphabet")
#> Creating new version '20211004T114937Z-ee580'
board %>% pin_download("alphabet")
#> [1] "~/.local/share/pins/alphabet/20211004T114937Z-ee580/file377043acfd3a"

Pinning a url

Finally, you can pin() a url to automatically re-download it when it changes:

# Legacy API
base <- "https://raw.githubusercontent.com/rstudio/pins/master/tests/testthat/"

(pin(paste0(base, "pin-files/first.txt"), board = "vignette"))
#> [1] "/tmp/Rtmp91HlWm/file37702301989d/first/first.txt"

This now needs to be made explicit with the new board_url(), and since this returns a path, not a file, you need to use pin_download():

# Modern API
board_github <- board_url(c(
  raw = paste0(base, "pin-files/first.txt")
))
board_github %>% pin_download("raw")
#> [1] "~/.cache/pins/url/87473d3442e598f929b65b6630da6fd8/first.txt"

Implicit board

It’s also possible to use pin() and pin_get() without an explicit board argument, in which case it automatically uses a local board:

# Legacy API
pin(data.frame(x = 1:3), "test-data")
pin_get("test-data")
#>   x
#> 1 1
#> 2 2
#> 3 3

To convert this code, you need to create an explicit board_local():

# Modern API
board <- board_local()

board %>% pin_write(data.frame(x = 1:3), "test-data")
#> Guessing `type = 'rds'`
#> Creating new version '20211004T114937Z-73dc1'
#> Writing to pin 'test-data'
board %>% pin_read("test-data")
#>   x
#> 1 1
#> 2 2
#> 3 3

Equivalents

Board functions

Legacy API Modern API
board_register_azure() board_azure()
board_register_datatxt() Not currently implemented
board_register_dospace() Not currently implemented
board_register_gcloud() Not currently implemented
board_register_github() Not currently implemented
board_register_local() board_local()
board_register_kaggle() board_kaggle_dataset() / board_kaggle_competition()
board_register_rsconnect() board_rsconnect()
board_register_s3() board_s3()
pin() with a URL board_url()

Future releases will add support for additional boards based on user feedback.