Save an ipums_extract to a JSON-formatted file.
For an overview of ipumsr microdata API functionality, see
vignette("ipums-api", package = "ipumsr").
save_extract_as_json(extract, file)An ipums_extract object.
File path at which to write the JSON-formatted extract definition.
The file path where the extract definition was written, invisibly.
Note that this function only saves out the properties of an extract that are required to submit a new extract request, namely, the description, data structure, data format, samples, variables, and collection.
Other ipums_api:
add_to_extract(),
define_extract_cps(),
define_extract_from_json(),
define_extract_usa(),
download_extract(),
extract_list_to_tbl(),
extract_tbl_to_list(),
get_extract_info(),
get_last_extract_info(),
get_recent_extracts_info,
ipums_data_collections(),
is_extract_ready(),
remove_from_extract(),
set_ipums_api_key(),
submit_extract(),
wait_for_extract()
my_extract <- define_extract_usa("Example", "us2013a", "YEAR")
extract_json_path <- file.path(tempdir(), "usa_extract.json")
save_extract_as_json(my_extract, file = extract_json_path)
copy_of_my_extract <- define_extract_from_json(extract_json_path)
identical(my_extract, copy_of_my_extract)
#> [1] TRUE