I am extending a DBI connection by
setClass("TSPostgreSQLConnection",
contains=c("PostgreSQLConnection","TSdbOptions"))
but the first time I use this I am getting a warning when it tries to
coerce the TSPostgreSQLConnection to a PostgreSQLConnection. After the
first use the warning stops, but the first warning is causing me
problems when I do automatic checks and set my tests to stop on
warnings. (I think there should be a correct way to do this that does
not produce a warning.) I can trace it back by setting options(warn=2)
as below. Do I need to be more specific about how the coercion
happens? If so, what is the correct way to coerce the
TSPostgreSQLConnection into a PostgreSQLConnection? If not, how to a get
rid of the warning?
Paul Gilbert
> TSdelete("vec", con)
Error: (converted from warning) Ambiguous method selection for "coerce",
target "TSPostgreSQLConnection#integer" (the first of the signatures
shown will be used)
PostgreSQLConnection#integer
dbObjectId#integer
> traceback()
15: doWithOneRestart(return(expr), restart)
14: withOneRestart(expr, restarts[[1]])
13: withRestarts({
.Internal(.signalCondition(simpleWarning(msg, call), msg,
call))
.Internal(.dfltWarn(msg, call))
}, muffleWarning = function() NULL)
12: .signalSimpleWarning("Ambiguous method selection for \"coerce\",
target \"TSPostgreSQLConnection#integer\" (the first of the signatures
shown will be used)\n PostgreSQLConnection#integer\n
dbObjectId#integer\n",
quote(NULL))
11: warning(gettextf(paste("Ambiguous method selection for \"%s\",
target \"%s\"",
"(the first of the signatures shown will be used)\n%s\n"),
[EMAIL PROTECTED], .sigLabel(classes), paste(" ", names(methods),
collapse = "\n")), domain = NA, call. = FALSE)
10: .findInheritedMethods(signature, fdef, mtable = allmethods, table =
mlist,
useInherited = useInherited, verbose = verbose)
9: selectMethod("coerce", sig, optional = TRUE, c(from = TRUE, to = FALSE),
fdef = coerceFun, mlist = coerceMethods)
8: as(obj, "integer")
7: isIdCurrent(con)
6: postgresqlQuickSQL(conn, statement, ...)
5: dbGetQuery(con, paste("SELECT tbl FROM Meta ", where, ";"))
4: dbGetQuery(con, paste("SELECT tbl FROM Meta ", where, ";"))
3: TSdbi:::TSdeleteSQL(serIDs = serIDs, con = con, ...)
2: TSdelete("vec", con)
1: TSdelete("vec", con)
> str(con)
Formal class 'TSPostgreSQLConnection' [package "TSPostgreSQL"] with 4 slots
..@ Id : int [1:2] 21795 1
..@ dbname : chr "test"
..@ vintage: logi FALSE
..@ panel : logi FALSE
====================================================================================
La version française suit le texte anglais.
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