You most likely wouldn't have a rule just like this one, but instead
would use the general idea -- matching the fact and then modifying it
in the rule's actions. If it's not obvious how to do this, then I
wonder if you're using Jess to write procedural, rather than rule-
based programs. Do you have rules at all?
On Jul 18, 2007, at 5:13 AM, M Ismail wrote:
many thanks for the replay. Bobs list is working fine but i am also
interested in how defrule my-rule works. how can i use it?
(defrule my-rule
?fact <- (objects (o_id 90)))
=>
(modify ?fact (o_description NoKnife)))
regards,
M.ismail
From: "Ernest Friedman-Hill" <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: [email protected]
Subject: Re: JESS: Modify in template
Date: Tue, 17 Jul 2007 12:34:47 -0400
To add one more option to Bob's list: as Jess is, after all, a
rule- based language, the intent is that most of the time you'll be
doing this sort of thing from a rule.
(defrule my-rule
?fact <- (objects (o_id 90)))
=>
(modify ?fact (o_description NoKnife)))
On Jul 17, 2007, at 11:14 AM, Robert Kirby wrote:
The modify function expects at least two parameters: the first is
the fact to be modified and the rest are slot name and
modification value pairs. If your Java code has the fact-id,
then it could be inserted into the string passed to
executeCommand (which is deprecated in 7.0 for eval). For
instance, if the fact-id for o_id==90 were 20090, then
r.eval("(modify 20090 (o_description NoKnife))");
should work.
A Jess query could look up the fact within a function:
(defquery object-id-query
"Look up fact id."
(declare (variables ?id))
?fact <- (objects (o_id ?id)))
(deffunction modify-object-description
"Modify objects instance description"
(?id ?description)
(bind ?results (run-query* object-id-query ?id))
(?results next) ; Assumes exactly one objects instance with ?id
(modify (?results get fact) (o_description ?description))
(close ?results)
nil)
then run
r.eval("(modify-object-description 90 NoKnife)");
Bob Kirby
At 04:19 AM 7/17/2007, M Ismail wrote:
Hi,
i am using a template:
(deftemplate objects
(slot o_id)
(slot o_description)
(slot o_is_visible)
(slot o_makes_sound)
(slot o_sound_volume)
(slot o_framenumber)
)
and i want to modify the o_decription of the object with o_id = 90
how can i do that? if i use:
r.executeCommand("(modify (objects (o_id 90) (o_description
NoKnife)))");
then i get errors and it doesnt work
best regards,
M. Ismail
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