redcap_variables {REDCapR}

Enumerate the exported variables

Description

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

Usage

redcap_variables(redcap_uri, token, verbose = TRUE, config_options = NULL)

Arguments

redcap_uri

The URI (uniform resource identifier) of the REDCap project. Required.

token

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

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 to pass to POST method in the httr package. See the details below. Optional.

Details

The full list of configuration options accepted by the httr package is viewable by executing httr::httr_options(). The httr package and documentation is available at https://cran.r-project.org/package=httr.

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.

Value

Currently, a list is returned with the following elements,

• data: An R base::data.frame() 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.

Author(s)

Will Beasley

References

The official documentation can be found on the 'API Help Page' and 'API Examples' pages on the REDCap wiki (i.e., https://community.projectredcap.org/articles/456/api-documentation.html and https://community.projectredcap.org/articles/462/api-examples.html). If you do not have an account for the wiki, please ask your campus REDCap administrator to send you the static material.

Examples

## Not run: 
uri         <- "https://bbmc.ouhsc.edu/redcap/api/"
token       <- "9A81268476645C4E5F03428B8AC3AA7B"
ds_variable <- REDCapR::redcap_variables(redcap_uri=uri, token=token)$data

## End(Not run)