[datatable-help] Import problem with data.table in packages

[Matthew Dowle]

Hi,

This rings a bell actually. data.table uses .onLoad currently but it 
should be using .onAttach, I seem to recall.

     
http://r.789695.n4.nabble.com/Error-in-a-package-that-imports-data-table-tp4660173p4660637.html

I had a hunt around but couldn't find if we decided data.table should 
move from .onLoad to .onAttach.  Does anyone know/remember?

Thanks, Matthew



On 01.05.2013 21:59, Ken Williams wrote:
> Hi,
>
> I've got a small test package constructed like so:
>
> ------------ R/MyCode.R: ---------------
> ##' Example function.
> ##'
> ##' @export
> ##' @import data.table
> myfunc <- function() {
>   dt1 <- data.table(time=1:5, key='time')
>   dt2 <- data.table(time=3:8, key='time')
>   dat <- merge(dt1, dt2, all=TRUE)
> }
>
> ------------ DESCRIPTION: ---------------
> Package: TestMod
> Type: Package
> Title: My test package
> Version: 1.0
> Author: Ken Williams <kwilliams at windlogics.com>
> Maintainer: Ken Williams <kwilliams at windlogics.com>
> Description: A test package
> License: BSD
> Imports:
>     data.table
> Collate:
>     'MyCode.R'
> -----------------------------------------------
>
> I process the package with ROxygen in RStudio, which produces an
> empty `inst/` directory, some docs in `man/`, and a `NAMESPACE` file:
>
> ------------ DESCRIPTION: ---------------
> export(myfunc)
> import(data.table)
> -----------------------------------------------
>
> Now, if I start a fresh R session and load this package, I get a
> namespace error:
>
> ------------ R 2.15.2 session: ---------------
>> library(TestMod)
>> myfunc
> function ()
> {
>     dt1 <- data.table(time = 1:5, key = "time")
>     dt2 <- data.table(time = 3:8, key = "time")
>     dat <- merge(dt1, dt2, all = TRUE)
> }
> <environment: namespace:TestMod>
>> myfunc()
> Error in rbind(deparse.level, ...) :
>   could not find function ".rbind.data.table"
> -----------------------------------------------
>
> Sometimes, in other (more complicated) code, I instead get the error
> 'could not find function "data.table"'.
>
> To my eyes, the imports look correct, so I can't see what the problem 
> is:
>
> ------------ R 2.15.2 session: ---------------
>> getNamespaceImports('TestMod')$data.table
>           %between%              %chin%              %like%
> .__C__data.table
>         "%between%"            "%chin%"            "%like%"
> ".__C__data.table"
>         .__C__IDate         .__C__ITime        .__T__$:base
> .__T__$<-:base
>       ".__C__IDate"       ".__C__ITime"      ".__T__$:base"
> ".__T__$<-:base"
>        .__T__[:base   .rbind.data.table                  :=
> alloc.col
>      ".__T__[:base" ".rbind.data.table"                ":="
> "alloc.col"
>      as.chron.IDate      as.chron.ITime       as.data.table
> as.IDate
>    "as.chron.IDate"    "as.chron.ITime"     "as.data.table"
> "as.IDate"
>            as.ITime             between             chgroup
>  chmatch
>          "as.ITime"           "between"           "chgroup"
> "chmatch"
>             chorder                  CJ                copy
> data.table
>           "chorder"                "CJ"              "copy"
> "data.table"
>               fread              haskey                hour
> IDateTime
>             "fread"            "haskey"              "hour"
> "IDateTime"
>       is.data.table                 key               key<-
>     last
>     "is.data.table"               "key"             "key<-"
>   "last"
>                like                mday               month
>  quarter
>              "like"              "mday"             "month"
> "quarter"
>           rbindlist                 set             setattr
> setcolorder
>         "rbindlist"               "set"           "setattr"
> "setcolorder"
>              setkey             setkeyv            setnames
>       SJ
>            "setkey"           "setkeyv"          "setnames"
>     "SJ"
>              tables     test.data.table           timetaken
> truelength
>            "tables"   "test.data.table"         "timetaken"
> "truelength"
>                wday                week                yday
>     year
>              "wday"              "week"              "yday"
>   "year"
> -----------------------------------------------
>
> Any suggestions?
>
> I think for now, I can work around the problem by doing 'Depends:
> data.table' in my `DESCRIPTION` file.  I'd like to not do that 
> though.
>
> --
> Ken Williams, Senior Research Scientist
> WindLogics
> http://windlogics.com
>
>
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