6:23 p.m.
I want to keep only 1 fact with id=="aaaa". But this is not working:
rule "leave only one"
when
$removeUs : java.util.List(size>1)
from collect(Fact(id=="aaaa")
then
size = $removeUs.size();
for (int i=1; i < size; i++) {
retract($removeUs.get(i));
}
end
12:55 a.m.
You cannot use an interfact (List) to instantiate an object, which
is happening due to the collect.
--W
On 30/11/2012, Martin Minka <martin.minka(a)gmail.com> wrote:
I want to keep only 1 fact with id=="aaaa". But this is not
working:
rule "leave only one"
when
$removeUs : java.util.List(size>1)
from collect(Fact(id=="aaaa")
then
size = $removeUs.size();
for (int i=1; i < size; i++) {
retract($removeUs.get(i));
}
end
1:01 a.m.
Thank you for the tip. What solution would you suggest to solve my problem ?
Martin
2012/11/30 Wolfgang Laun <wolfgang.laun(a)gmail.com>
You cannot use an interfact (List) to instantiate an object, which
is happening due to the collect.
--W
On 30/11/2012, Martin Minka <martin.minka(a)gmail.com> wrote:
> I want to keep only 1 fact with id=="aaaa". But this is not working:
>
> rule "leave only one"
> when
> $removeUs : java.util.List(size>1)
> from collect(Fact(id=="aaaa")
> then
> size = $removeUs.size();
> for (int i=1; i < size; i++) {
> retract($removeUs.get(i));
> }
> end
>
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1:48 a.m.
On 30/11/2012, Martin Minka <martin.minka(a)gmail.com> wrote:
Thank you for the tip. What solution would you suggest to solve my
problem
?
Look into the javadoc of java.util to find any class implementing List :-)
-W
Martin
2012/11/30 Wolfgang Laun <wolfgang.laun(a)gmail.com>
> You cannot use an interfact (List) to instantiate an object, which
> is happening due to the collect.
> --W
>
> On 30/11/2012, Martin Minka <martin.minka(a)gmail.com> wrote:
> > I want to keep only 1 fact with id=="aaaa". But this is not working:
> >
> > rule "leave only one"
> > when
> > $removeUs : java.util.List(size>1)
> > from collect(Fact(id=="aaaa")
> > then
> > size = $removeUs.size();
> > for (int i=1; i < size; i++) {
> > retract($removeUs.get(i));
> > }
> > end
> >
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
2:19 a.m.
I was using ArrayList before and I don't think this is the real problem.
collect() will return object compatible with List interface so it is valid
to use size() and get() methods on $removeUs.
I have helper method myhelper.log() with accepts any object and *
myhelper.log($removeUs.get(i))* works for me, unfortunately
*retract($removeUs.get(i))
*doesn't work with error:
Error: unable to resolve method using strict-mode:
org.drools.spi.KnowledgeHelper.drools()] [Near : {...
drools.retract($removeUs ....}]
It looks like it is not even compiled.
2012/11/30 Wolfgang Laun <wolfgang.laun(a)gmail.com>
On 30/11/2012, Martin Minka <martin.minka(a)gmail.com> wrote:
> Thank you for the tip. What solution would you suggest to solve my
problem
> ?
Look into the javadoc of java.util to find any class implementing List :-)
-W
>
> Martin
>
>
> 2012/11/30 Wolfgang Laun <wolfgang.laun(a)gmail.com>
>
>> You cannot use an interfact (List) to instantiate an object, which
>> is happening due to the collect.
>> --W
>>
>> On 30/11/2012, Martin Minka <martin.minka(a)gmail.com> wrote:
>> > I want to keep only 1 fact with id=="aaaa". But this is not
working:
>> >
>> > rule "leave only one"
>> > when
>> > $removeUs : java.util.List(size>1)
>> > from collect(Fact(id=="aaaa")
>> > then
>> > size = $removeUs.size();
>> > for (int i=1; i < size; i++) {
>> > retract($removeUs.get(i));
>> > }
>> > end
>> >
>> _______________________________________________
>> rules-users mailing list
>> rules-users(a)lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
3:06 a.m.
It seems you are using dialect "mvel"? This doesn't work
in 5.2.0, 5.3.0 and 5.4.0. (I haven't tried 5.5)
Use dialect java.
-W
On 30/11/2012, Martin Minka <martin.minka(a)gmail.com> wrote:
I was using ArrayList before and I don't think this is the real
problem.
collect() will return object compatible with List interface so it is valid
to use size() and get() methods on $removeUs.
I have helper method myhelper.log() with accepts any object and *
myhelper.log($removeUs.get(i))* works for me, unfortunately
*retract($removeUs.get(i))
*doesn't work with error:
Error: unable to resolve method using strict-mode:
org.drools.spi.KnowledgeHelper.drools()] [Near : {...
drools.retract($removeUs ....}]
It looks like it is not even compiled.
2012/11/30 Wolfgang Laun <wolfgang.laun(a)gmail.com>
> On 30/11/2012, Martin Minka <martin.minka(a)gmail.com> wrote:
> > Thank you for the tip. What solution would you suggest to solve my
> problem
> > ?
>
> Look into the javadoc of java.util to find any class implementing List
> :-)
> -W
>
> >
> > Martin
> >
> >
> > 2012/11/30 Wolfgang Laun <wolfgang.laun(a)gmail.com>
> >
> >> You cannot use an interfact (List) to instantiate an object, which
> >> is happening due to the collect.
> >> --W
> >>
> >> On 30/11/2012, Martin Minka <martin.minka(a)gmail.com> wrote:
> >> > I want to keep only 1 fact with id=="aaaa". But this is not
working:
> >> >
> >> > rule "leave only one"
> >> > when
> >> > $removeUs : java.util.List(size>1)
> >> > from collect(Fact(id=="aaaa")
> >> > then
> >> > size = $removeUs.size();
> >> > for (int i=1; i < size; i++) {
> >> > retract($removeUs.get(i));
> >> > }
> >> > end
> >> >
> >> _______________________________________________
> >> rules-users mailing list
> >> rules-users(a)lists.jboss.org
> >> https://lists.jboss.org/mailman/listinfo/rules-users
> >>
> >
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
3:13 a.m.
Another way to obtain what you are looking for could be this:
rule "Remove all but one"
when
$f1: Fact(id == "aaa")
$f2: Fact(id == "aaa", this != $f1)
then
retract($f2);
end
The difference with this approach is the number of activations you will
have.
Best Regards,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Blog @ http://ilesteban.wordpress.com
On Fri, Nov 30, 2012 at 10:06 AM, Wolfgang Laun <wolfgang.laun(a)gmail.com>wrote:
It seems you are using dialect "mvel"? This doesn't
work
in 5.2.0, 5.3.0 and 5.4.0. (I haven't tried 5.5)
Use dialect java.
-W
On 30/11/2012, Martin Minka <martin.minka(a)gmail.com> wrote:
> I was using ArrayList before and I don't think this is the real problem.
> collect() will return object compatible with List interface so it is
valid
> to use size() and get() methods on $removeUs.
> I have helper method myhelper.log() with accepts any object and *
> myhelper.log($removeUs.get(i))* works for me, unfortunately
> *retract($removeUs.get(i))
> *doesn't work with error:
>
> Error: unable to resolve method using strict-mode:
> org.drools.spi.KnowledgeHelper.drools()] [Near : {...
> drools.retract($removeUs ....}]
>
> It looks like it is not even compiled.
>
> 2012/11/30 Wolfgang Laun <wolfgang.laun(a)gmail.com>
>
>> On 30/11/2012, Martin Minka <martin.minka(a)gmail.com> wrote:
>> > Thank you for the tip. What solution would you suggest to solve my
>> problem
>> > ?
>>
>> Look into the javadoc of java.util to find any class implementing List
>> :-)
>> -W
>>
>> >
>> > Martin
>> >
>> >
>> > 2012/11/30 Wolfgang Laun <wolfgang.laun(a)gmail.com>
>> >
>> >> You cannot use an interfact (List) to instantiate an object, which
>> >> is happening due to the collect.
>> >> --W
>> >>
>> >> On 30/11/2012, Martin Minka <martin.minka(a)gmail.com> wrote:
>> >> > I want to keep only 1 fact with id=="aaaa". But this is
not
working:
>> >> >
>> >> > rule "leave only one"
>> >> > when
>> >> > $removeUs : java.util.List(size>1)
>> >> > from collect(Fact(id=="aaaa")
>> >> > then
>> >> > size = $removeUs.size();
>> >> > for (int i=1; i < size; i++) {
>> >> > retract($removeUs.get(i));
>> >> > }
>> >> > end
>> >> >
>> >> _______________________________________________
>> >> rules-users mailing list
>> >> rules-users(a)lists.jboss.org
>> >> https://lists.jboss.org/mailman/listinfo/rules-users
>> >>
>> >
>> _______________________________________________
>> rules-users mailing list
>> rules-users(a)lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
3:56 a.m.
thank you for help. my summary for 5.5.0.Final:
1. *Esteban's suggestion works*, but of course requires more activations
2. Wolfgang's suggestion to *use java dialect* works
3. it looks like there is *no way to achieve the same with mvel* dialect
sincerely,
Martin
2012/11/30 Esteban Aliverti <esteban.aliverti(a)gmail.com>
rule "Remove all but one"
when
$f1: Fact(id == "aaa")
$f2: Fact(id == "aaa", this != $f1)
then
retract($f2);
end
4376
days inactive
4376
days old
7 comments
3 participants
participants (3)
-
Esteban Aliverti -
Martin Minka -
Wolfgang Laun