In a let statement I can do this:
(let [[this-users-conversation salesforce-object-name name-of-attribute]
args]
I would like to do this destructuring in my defmethods, but if I do this:
(defmethod discern "find-user-credentials"
[[this-users-conversation salesforce-object-name name-of-attribute]]
or:
(defmethod discern "find-user-credentials"
[this-users-conversation salesforce-object-name name-of-attribute]
I get:
:class clojure.lang.ArityException,
:message "Wrong number of args (2) passed to: intent/fn--64",
Is there any way to do the destructuring as part of the definition of
defmethod, or do I have to do it in a let statement?
On Wednesday, September 30, 2015 at 9:38:09 PM UTC-4, Sean Corfield wrote:
>
> 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: <clo...@googlegroups.com <javascript:>> on behalf of Lawrence
> Krubner
> Reply-To: <clo...@googlegroups.com <javascript:>>
> 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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