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#' Update a document.
#'
#' @export
#' @template all
#' @template return
#' @param dbname (character) Database name. Required.
#' @param doc (character) Document content. Required.
#' @param docid (character) Document ID. Required.
#' @param rev (character) Revision id. Required.
#' @details Internally, this function adds in the docid and revision id,
#' required to do a document update
#' @examples \dontrun{
#' user <- Sys.getenv("COUCHDB_TEST_USER")
#' pwd <- Sys.getenv("COUCHDB_TEST_PWD")
#' (x <- Cushion$new(user=user, pwd=pwd))
#'
#' if ("sofadb" %in% db_list(x)) {
#' invisible(db_delete(x, dbname="sofadb"))
#' }
#' db_create(x, dbname='sofadb')
#'
#' doc1 <- '{"name":"drink","beer":"IPA"}'
#' doc_create(x, dbname="sofadb", doc=doc1, docid="b_beer")
#' doc_get(x, dbname = "sofadb", docid = "b_beer")
#' revs <- db_revisions(x, dbname = "sofadb", docid = "b_beer")
#' doc2 <- '{"name":"drink","beer":"IPA","note":"yummy","note2":"yay"}'
#' doc_update(x, dbname="sofadb", doc=doc2, docid="b_beer", rev=revs[1])
#' db_revisions(x, dbname = "sofadb", docid = "b_beer")
#' }
doc_update <- function(cushion, dbname, doc, docid, rev, as = 'list', ...) {
check_cushion(cushion)
url <- file.path(cushion$make_url(), dbname, docid)
doc2 <- sub("^\\{", sprintf('{"_id":"%s", "_rev":"%s",', docid, rev),
check_inputs(doc))
sofa_PUT(url, as, body = doc2, encode = "json", cushion$get_headers(),
cushion$get_auth(), ...)
}
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