Your example works for me as follows:
user> (defn- discern
([this-users-conversation]
{:pre [(map? this-users-conversation)]}
(:intent this-users-conversation))
([this-users-conversation salesforce-object-name]
{:pre [(map? this-users-conversation)
(string? salesforce-object-name)]}
(:intent this-users-conversation))
([this-users-conversation salesforce-object-name name-of-attribute]
{:pre [(map? this-users-conversation)
(string? salesforce-object-name)
(string? name-of-attribute)]}
(:intent this-users-conversation))
([this-users-conversation salesforce-object-name name-of-attribute
name-of-intent]
{:pre [(map? this-users-conversation)
(string? salesforce-object-name)
(keyword? name-of-attribute)
(string? name-of-intent)]}
name-of-intent))
#'user/discern
user> (defmulti intent
(fn [& args]
(apply discern args)))
#'user/intent
user> (defmethod intent nil [& args] (str "I got nil plus " args))
#object[clojure.lang.MultiFn 0x40954538 "clojure.lang.MultiFn@40954538"]
user> (defmethod intent "query-salesforce-for-attribute" [& args] (str "SQFFA "
args))
#object[clojure.lang.MultiFn 0x40954538 "clojure.lang.MultiFn@40954538"]
user> (defmethod intent :default [& args] (str "WAT? " args))
#object[clojure.lang.MultiFn 0x40954538 "clojure.lang.MultiFn@40954538"]
user> (def this-users-conversation {})
#'user/this-users-conversation
user> (intent this-users-conversation "Opportunity" :Name
"query-salesforce-for-attribute")
"SQFFA ({} \"Opportunity\" :Name \"query-salesforce-for-attribute\")"
user> (intent this-users-conversation "Opportunity" "Name")
"I got nil plus ({} \"Opportunity\" \"Name\")"
user> (intent {:intent "do-something"} "Opportunity" "Name")
"WAT? ({:intent \"do-something\"} \"Opportunity\" \"Name\")"
Sean Corfield -- (904) 302-SEAN
An Architect's View -- http://corfield.org/
"If you're not annoying somebody, you're not really alive."
-- Margaret Atwood
From: <clojure@googlegroups.com> on behalf of Lawrence Krubner
Reply-To: <clojure@googlegroups.com>
Date: Wednesday, September 30, 2015 at 5:33 PM
To: Clojure
Subject: can I use varargs in a multimethod?
>For maximum flexibility I wanted to use a multimethod, defined like this:
>
>
>(defmulti intent
> (fn [& args]
> (apply discern args)))
>
>
>This is how discern is defined:
>
>(defn- discern
>
> ([this-users-conversation]
> {:pre [(map? this-users-conversation)]}
> (:intent this-users-conversation))
>
> ([this-users-conversation salesforce-object-name]
> {:pre [(map? this-users-conversation)
> (string? salesforce-object-name)]}
> (:intent this-users-conversation))
>
> ([this-users-conversation salesforce-object-name name-of-attribute]
> {:pre [(map? this-users-conversation)
> (string? salesforce-object-name)
> (string? name-of-attribute)]}
> (:intent this-users-conversation))
>
> ([this-users-conversation salesforce-object-name name-of-attribute
> name-of-intent]
> {:pre [(map? this-users-conversation)
> (string? salesforce-object-name)
> (keyword? name-of-attribute)
> (string? name-of-intent)]}
> name-of-intent))
>
>
>but then I call the multimethod like this:
>
>(intent this-users-conversation "Opportunity" :Name
>"query-salesforce-for-attribute")
>
>
>and I get:
>
>:class clojure.lang.ArityException,
>:message "Wrong number of args (4) passed to: query/fn--65",
>
>
>Should I give up on this idea, or is there a way to make this work?
>
>
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