Paul Gilbert <[EMAIL PROTECTED]> writes: > (I am not sure if this is a bug or a request for a more understandable > warning, or possible something obvious I should be posting on r-help.) > > I am trying to coerce an new class object to be a DBIConnection and it > does not work the way I think it should: > > R version 2.5.1 (2007-06-27) ... > > require("RMySQL") # or require("RSQLite") > Loading required package: RMySQL > Loading required package: DBI > [1] TRUE > > m <- dbDriver("MySQL") # or m <- dbDriver("SQLite") > > con <- dbConnect(m, dbname="test") > > dbGetQuery(con, "create table zzz ( > + vintage VARCHAR(20) NOT NULL, > + alias VARCHAR(20) default NULL, > + Documentation TEXT, > + PRIMARY KEY (vintage) > + );") > NULL > > dbListTables(con) > [1] "zzz" > > setClass("TSconnection", representation(con="DBIConnection", > + vintage = "logical", > + panel = "logical") > + ) > [1] "TSconnection" > > setAs("TSconnection", "DBIConnection", def = function(from) [EMAIL > PROTECTED])
I think things work as you expect up until this pint. > > setIs("TSconnection", "DBIConnection", coerce = function(x) > > [EMAIL PROTECTED]) I'm confused about what you want to do here. If you want TSconnection to be a DBIConnection, why wouldn't you use inheritance? setClass("TSconnection", contains="DBIConnection", ...) + seth -- Seth Falcon | Computational Biology | Fred Hutchinson Cancer Research Center http://bioconductor.org ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel