[R-pkg-devel] Working with connections

Hi All,

I use connections to open and close data folders needed by my package.
After each function closes I get the following warnings (depending on the
connection that has been opened).

10: closing unused connection 3
(/Library/Frameworks/R.framework/Versions/3.2/Resources/library/BondLab/BondData/bondlabMBS4.rds)

Below is the connection function that is related to the above warning:

#------------------------------------------------------------------------------------
  #' A connection function to BondData calling MBS cusps
  #'
  #' Opens a connection to the BondData folder to call MBS cusip data
  #' @param MBS.id A character string the MBS.id or cusip number current
MBS.id is supported
  #' @export
  MBS <- function(MBS.id = "character"){
                  MBS.Conn <- gzfile(description = paste(system.file(package
= "BondLab"),
                              "/BondData/", MBS.id, ".rds", sep = ""), open
= "rb")
                  MBS <- readRDS(MBS.Conn)
                  return(MBS)
                  close.connection(MBS.Conn)
                  }

I have googled this warning and it seems to be triggered when a function
terminates and the connection is open.  But, I think the connection function
closes the connection once the object is returned.  What am I doing wrong?

-Glenn