I am running into difficulty with the fact-slot-value function. In a rule,
the LHS binds a deftemplated fact to a variable called ?second, then in the
RHS I try to access the value of one of the slots with the fact-slot-value
method. I am NOT using an enumeration, just a standard fact:
;bind the remaining sections perfect-bound
(defrule bind-a-section-perfect-bound
(Part (bindingStyle "perfect-bound"))
?first <- (Section (binds-next-to ?bnt&~nil))
?second <- (Section (binds-next-to nil))
=>
(assert (Section (pageCount (fact-slot-value ?second pageCount))
(maxPageCount (fact-slot-value ?second maxPageCount))
(sectionID (fact-slot-value ?second sectionID))
(binds-next-to ?first))
)
(retract ?second)
)
I get this error:
Jess reported an error in routine call
while executing (call (engine) findFactByID ?__fact-id)
while executing (bind ?__fact (call (engine) findFactByID ?__fact-id))
while executing deffunction fact-slot-value
while executing (fact-slot-value ?second pageCount)
while executing (assert (Section (pageCount (fact-slot-value ?second
pageCount)) (maxPageCount (fact-slot-value ?second maxPageCount)) (sectionID
(fact-slot-value ?second sectionID)) (binds-next-to ?first)))
while executing defrule bind-a-section-perfect-bound
while executing (run).
Message: No overloading of method 'findFactByID' in class jess.Rete I can
call with these arguments: (call (engine) findFactByID ?__fact-id).
Program text: ( run ) at line 36.
I have triple-checked the slot names are correct, though I don't think that
is it. I am running Jess 6.0a3. I am working around it for now by binding
variables to the value of the section in the LHS, but I'd rather use the
fact-slot-value for clarity.
> ______________________________________________
> Matt Bishop - Engineering Manager, UpFront
>
> We're Growing - http://www.scenicsoft.com/jobs
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