> It's impossible to redefine the dispatch function within
> the definition of the multimethod after the first call to 'defmulti'.
That is a funny way to word it. I think you are saying that there is no way
to have the multiple arities?
On Wednesday, September 30, 2015 at 8:45:25 PM UTC-4, Gary Trakhman wrote:
>
> It works for me, for '(intent {} "yes" :yes "WAT")'
>
> I get the error: IllegalArgumentException No method in multimethod
> 'intent' for dispatch value: WAT clojure.lang.MultiFn.getFn
> (MultiFn.java:156)
>
> You're probably being bitten by a different issue. It's impossible to
> redefine the dispatch function within the definition of the multimethod
> after the first call to 'defmulti'. In order to do so, you would have to
> first ns-unmap that var.
>
> An alternative for development is to use the dispatch function's Var as
> the dispatch function:
> (defn intent-dispatch [& args]
> (apply discern args))
> (defmulti intent #'intent-dispatch)
>
>
> On Wed, Sep 30, 2015 at 8:33 PM Lawrence Krubner <[email protected]
> <javascript:>> wrote:
>
>> 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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