R/idig_top_records.R

In ridigbio: Interface to the iDigBio Data API

##' Top specimen records summaries.
##'
##' Summarize the count of specimen records in iDigBio according to unique
##' values in the fields passed. This operates similarly to a SELECT DISTINCT
##' count(field_name) query in SQL. When multiple fields are passed, the
##' summaries are nested eg fields=c("country", "genus") would result in
##' counting the top 10 genera in each of the top 10 countries for a total of
##' 100 counts.
##' @title Top records endpoint
##' @param rq iDigBio record query in nested list format
##' @param top_fields vector of field names to summarize by
##' @param count maximum number of results to return, capped at 1000
##' @param ... additional parameters
##' @return nested list of field values with counts of specimen records
##' @author Matthew Collins
##' @export
##'
idig_top_records <- function(rq = FALSE, top_fields = FALSE, count = 0, ...) {
  # This passes through an empty list to get around idig_POST's requirement that
  # rq be present. For full API compatability, the post should be completely
  # empty if the user doesn't specify anything
  query <- list()

  if (inherits(rq, "list") && length(rq) > 0) {
    query$rq <- rq
  }

  if (inherits(top_fields, "character") && length(top_fields) > 0) {
    query$top_fields <- top_fields
  }

  if (count > 0) {
    query$count <- count
  }

  view_results <- idig_POST("summary/top/records", body = query, ...)
  fmt_toprecords_txt_to_list(view_results)
}

fmt_toprecords_txt_to_list <- function(txt) {
  httr::content(txt)
}