texreg extract method in own package: error, setMethod()! no existing definition for function ‘extract’

[stefanj]

Hi,

I am developing a package called EDCS. I want to include an extract method for texreg to print tables of estimated models, where the models are of class EDCSfitted. Unfortunately, I keep getting an error: setMethod()! no existing definition for function ‘extract’

According to the texreg vignette, you simply create a custom function and register this function as a method for texreg's generic extract() function. In my case:

#' @export
extract.EDCSfitted <- function(model, ...) { # My custom function
   ....
  return(tr) # Return a texreg object
}

#' @export
methods::setMethod(
  "extract",
  signature = methods::className("EDCSfitted", "EDCS"),
  definition = extract.EDCSfitted)

Unfortunately, trying to build the package results in the error:

Error in `load_all()`:
! Failed to load 'R/generics.R'
Caused by error in `methods::setMethod()`:
! no existing definition for function ‘extract’

Herewith an extract from my DESCRIPTION file:

Roxygen: list(markdown = TRUE)
RoxygenNote: 7.2.3
Depends:
    methods,
    zoo,
    sandwich
LinkingTo: 
    Rcpp,
    RcppEigen,
    StanHeaders,
    RcppParallel
Imports: 
    Rcpp,
    texreg
Suggests:
    WeightedPortTest,
    vrtest
SystemRequirements:
    C++14,
    GNU make

I have compared my code to some other packages' code on GitHub and I can't really pinpoint the issue. I also tried several different variations where I don't use fully qualified and added #' @importFrom texreg extract before #' @export. Nothing seems to work.

Unfortunately, I cannot make my package public at this stage.

I'd really appreciate some help or suggestions.