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Export Events

Source: R/redcap-event-read.R
redcap_event_read.Rd

Export Events of a REDCap project

Usage

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

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.

Value

Currently, a list is returned with the following elements:

  • data: a tibble::tibble() with one row per arm-event combination. The columns are event_name (a human-friendly string), arm_num (an integer), unique_event_name (a string), custom_event_label (a string), and event_id (an integer).

  • 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.

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.

Author

Ezra Porter, Will Beasley

Examples

if (FALSE) { # \dontrun{
uri            <- "https://redcap-dev-2.ouhsc.edu/redcap/api/"

# Query a longitudinal project with a single arm and 3 events
token_1  <- "76B4A71A0158BD34C98F10DA72D5F27C" # arm-single-longitudinal
result_1 <- REDCapR::redcap_event_read(redcap_uri=uri, token=token_1)
result_1$data

# Query a longitudinal project with 2 arms and complex arm-event mappings
token_2  <- "DA6F2BB23146BD5A7EA3408C1A44A556" # longitudinal
result_2 <- REDCapR::redcap_event_read(redcap_uri=uri, token=token_2)
result_2$data

# Query a classic project without events
token_3  <- "F9CBFFF78C3D78F641BAE9623F6B7E6A" # simple-write
result_3 <- REDCapR::redcap_event_read(redcap_uri=uri, token=token_3)
result_3$data
} # }