从另一个包扩展S4类:ReconcileProperties和Prototype错误

RJDBC::JDBCConnection 因为我需要自定义方法来连接 dbplyr 使用来自的方法打包 dplyr#2941 (最初 from here *.JDBCConnection 方法,但希望为的子类编写方法 JDBCConnection .

this Stack Overflow question ,我写了我的软件包,基本上是这样的:

### R/testclass.R ####################
#' Test class
#'
#' This extends JDBCConnection in package RJDBC
#'
#' @import RJDBC
#'
setClass("TestConnection", contains = "JDBCConnection")

### DESCRIPTION ######################
Package: test
Type: Package
Title: What the Package Does (Title Case)
Version: 0.1.0
Author: Who wrote it
Maintainer: The package maintainer <yourself@somewhere.net>
Description: More about what it does (maybe more than one line)
    Use four spaces when indenting paragraphs within the Description.
License: What license is it under?
Encoding: UTF-8
LazyData: true

我要扩展的类存在,可以用 help("JDBCConnection-class", package = "RJDBC") .

devtools::document() 在此包中,返回以下错误:

Updating test documentation
Loading test

Error in reconcilePropertiesAndPrototype(name, slots, prototype, superClasses,  : 
no definition was found for superclass "JDBCConnection" in the specification of class "TestConnection"

@import @importClassesFrom as per this SO question ,但结果是一样的。

document() 去跑步?