REDCapR (version 1.7.0)

redcap_variables: Enumerate the exported variables

Description

This function calls the 'exportFieldNames' function of the REDCap API.

Usage

redcap_variables(
  redcap_uri,
  token,
  delimiter = ",",
  verbose = TRUE,
  config_options = NULL,
  handle_httr = NULL
)

Value

Currently, a list is returned with the following elements,

• data: A tibble::tibble() where each row represents one column in the REDCap dataset.

• success: A boolean value indicating if the operation was apparently successful.

• status_code: The http status code of the operation.

• outcome_message: A human readable string indicating the operation's outcome.

• elapsed_seconds: The duration of the function.

• raw_text: If an operation is NOT successful, the text returned by REDCap. If an operation is successful, the raw_text is returned as an empty string to save RAM.

Arguments

redcap_uri

The uri/url of the REDCap server typically formatted as "https://server.org/apps/redcap/api/". Required.

token

The user-specific string that serves as the password for a project. Required.

delimiter

A single-character value passed to the delim parameter of readr::read_delim(). Options include:

1. , (a comma, the default),

2. ; (a semi-colon),

3. | (a pipe),

4. ^ (a caret), or

5. \t (a tab).

verbose

A boolean value indicating if messages should be printed to the R console during the operation. The verbose output might contain sensitive information (e.g. PHI), so turn this off if the output might be visible somewhere public. Optional.

config_options

A list of options passed to httr::POST(). See details at httr::httr_options(). Optional.

handle_httr

The value passed to the handle parameter of httr::POST(). This is useful for only unconventional authentication approaches. It should be NULL for most institutions. Optional.

Author

Will Beasley

Details

As of REDCap version 6.14.2, three variable types are not returned in this call: calculated, file, and descriptive. All variables returned are writable/uploadable.

References

The official documentation can be found on the 'API Help Page' and 'API Examples' pages on the REDCap wiki (i.e., https://redcap.vumc.org/community/post.php?id=456 and https://redcap.vumc.org/community/post.php?id=462 ). If you do not have an account for the wiki, please ask your campus REDCap administrator to send you the static material.

Examples

if (FALSE) {
uri         <- "https://redcap-dev-2.ouhsc.edu/redcap/api/"
token       <- "9A068C425B1341D69E83064A2D273A70"

ds_variable <- REDCapR::redcap_variables(redcap_uri=uri, token=token)$data
}