Add more information regarding packages implementing dplyr methods. (#17)

* Add more information regarding packages implementing dplyr methods.

* Reword

Author: JasperSch

editbl/R/eDT.R

@@ -58,7 +58,9 @@ eDTOutput <- function(id,...) {
 #' @details All arguments except 'id' and 'env' can be normal objects or reactive objects.
 #' 
 #' @param id `character(1)` module id
-#' @param data `tbl`. The function will automatically cast to tbl if needed.
+#' @param data `tbl`. When using non-standard tibble objects, install the required package implementing specific methods.
+#' (`data.table`: dtplyr, spark: sparklyr, generic database: dbplyr,...).
+#' While other tabular objects like `data.frame` are supported, explicitly casting to `tbl` is recommended.
 #' @inheritParams DT::datatable
 #' @param keys `character`. Defaults to all columns under the assumption that at least every row is unique.
 #' @param format function accepting and returning a \code{\link[DT]{datatable}}

editbl/R/utils.R

@@ -126,6 +126,7 @@ castToTbl <- function(data){
   if(dplyr::is.tbl(data)){
     result <- data
   } else if(inherits(data, 'data.table')){
+	requireNamespace('dtplyr')
     result <- dtplyr::lazy_dt(data)
   } else {
     result <- dplyr::as_tibble(data)