5:22 a.m.
Hi guys,
I was writing some rules using backward chaining and found a strange
behavior.
I managed to isolate the error in the test project I'm attaching.
In the project I have 2 classes: Parent and Child
Parent:
* String id
* String attribute1
* String attribute2
* List<Child> children
Child:
* String parentId;
* String name;
* String value;
In the test I'm creating 1 Parent object with just 1 child and then
inserting the Parent object into a drools session:
Parent p1 = new Parent();
p1.setId("1");
p1.setAttribute1("a1");
p1.setAttribute2(null);
Child c1p1 = new Child();
c1p1.setName("n1");
c1p1.setParentId(p1.getId());
c1p1.setValue("v1.1");
p1.addChild(c1p1);
kSession.insert(p1);
kSession.fireAllRules();
So far so good.
The rules I have in my session are the following:
declare Parent
@propertyReactive
end
query getChildWithName(String $parentId, String $name, Child $child)
$child:= Child(parentId == $parentId, name == $name)
end
rule "Insert Children"
when
$p: Parent() @watch(!*)
$c: Child() from $p.children
then
System.out.println("Inserting child "+$c);
insert($c);
end
rule "Rule A"
when
$p: Parent(attribute2 != null)
?getChildWithName($p.attribute2, "n1", $child;)
then
System.out.println("FOUND: "+$child+". The attribute 'parentId'
of this
object must have the value '"+$p.getAttribute2()+"'. Does it?
"+$child.getParentId()+" == "+$p.getAttribute2()+" ??");
globalList.add($child);
end
rule "Copy Attribute1 into Attribute2"
when
$p: Parent(attribute1 != null, attribute2 == null)
then
modify($p){
setAttribute2($p.getAttribute1())
}
end
The important part here is 'Rule A' and 'Copy Attribute1 into
Attribute2'.
The latter copies the value of attribute1 to attribute2 for any Parent
object present in the session. (Note that the parent I'm inserting has
attribute2 = null). 'Rule A' is then using a query to get a Child object
that has a parent with id = $p.attribute2 (where $p is a previously matched
Parent).
Given that I only have 1 Parent in my session and that its id is '1' I
don't expect 'Rule A' to be activated/executed. When I modify
parent.attribute2 in 'Copy Attribute1 into Attribute2' I'm setting its
value to 'a1'. 'Rule A' (via the query) should then look for a Child with
parentid = 'a1' and It shouldn't find anything.
Funny thing is that 'Rule A' activates and fires. The child object that is
'returned' by the query has a parentId of '1' so I don't know how
this
behavior is possible. If you take a look at the System.out output you will
see that the activation makes no sense at all.
Am I doing something wrong in my project? Is this a bug? Is this the
expected behavior?
Regards,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Blog @ http://ilesteban.wordpress.com
6:46 a.m.
I'd say it's a bug... maybe indexing is involved?
Replacing ruleA's LHS with
$p: Parent( $a2 : attribute2 != null)
?getChildWithName($a2 , "n1", $child;)
makes it work as expected. I will investigate further.
Davide
On 01/22/2014 02:22 PM, Esteban Aliverti wrote:
Hi guys,
I was writing some rules using backward chaining and found a strange
behavior.
I managed to isolate the error in the test project I'm attaching.
In the project I have 2 classes: Parent and Child
Parent:
* String id
* String attribute1
* String attribute2
* List<Child> children
Child:
* String parentId;
* String name;
* String value;
In the test I'm creating 1 Parent object with just 1 child and then
inserting the Parent object into a drools session:
Parent p1 = new Parent();
p1.setId("1");
p1.setAttribute1("a1");
p1.setAttribute2(null);
Child c1p1 = new Child();
c1p1.setName("n1");
c1p1.setParentId(p1.getId());
c1p1.setValue("v1.1");
p1.addChild(c1p1);
kSession.insert(p1);
kSession.fireAllRules();
So far so good.
The rules I have in my session are the following:
declare Parent
@propertyReactive
end
query getChildWithName(String $parentId, String $name, Child $child)
$child:= Child(parentId == $parentId, name == $name)
end
rule "Insert Children"
when
$p: Parent() @watch(!*)
$c: Child() from $p.children
then
System.out.println("Inserting child "+$c);
insert($c);
end
rule "Rule A"
when
$p: Parent(attribute2 != null)
?getChildWithName($p.attribute2, "n1", $child;)
then
System.out.println("FOUND: "+$child+". The attribute
'parentId' of
this object must have the value '"+$p.getAttribute2()+"'. Does it?
"+$child.getParentId()+" == "+$p.getAttribute2()+" ??");
globalList.add($child);
end
rule "Copy Attribute1 into Attribute2"
when
$p: Parent(attribute1 != null, attribute2 == null)
then
modify($p){
setAttribute2($p.getAttribute1())
}
end
The important part here is 'Rule A' and 'Copy Attribute1 into
Attribute2'. The latter copies the value of attribute1 to attribute2
for any Parent object present in the session. (Note that the parent
I'm inserting has attribute2 = null). 'Rule A' is then using a query
to get a Child object that has a parent with id = $p.attribute2 (where
$p is a previously matched Parent).
Given that I only have 1 Parent in my session and that its id is '1' I
don't expect 'Rule A' to be activated/executed. When I modify
parent.attribute2 in 'Copy Attribute1 into Attribute2' I'm setting its
value to 'a1'. 'Rule A' (via the query) should then look for a Child
with parentid = 'a1' and It shouldn't find anything.
Funny thing is that 'Rule A' activates and fires. The child object
that is 'returned' by the query has a parentId of '1' so I don't
know
how this behavior is possible. If you take a look at the System.out
output you will see that the activation makes no sense at all.
Am I doing something wrong in my project? Is this a bug? Is this the
expected behavior?
Regards,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Blog @ http://ilesteban.wordpress.com
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
6:57 a.m.
Indeed, the use case can be simplified further:
package org.drools.test.bc;
declare Parent
attribute2 : String
end
declare Child
parentId : String
end
query getChildWithName( String $parentId, Child $child )
$child:= Child( parentId == $parentId )
end
rule "Insert Children"
when
then
Parent p1 = new Parent( "a1" );
Child c1p1 = new Child( "1" );
insert( c1p1 );
insert( p1 );
end
rule "Rule A"
when
$p: Parent( $a2 : attribute2 )
?getChildWithName( $p.attribute2, $child;)
then
System.out.println("FOUND: "+ $child + " >> " +
$child.getParentId()
+ " == " + $p.getAttribute2() + " ??" );
end
It has nothing to do with nested objects, @PR or modifications.
It seems that the culprit is the chained property accessor.
Davide
On 01/22/2014 02:22 PM, Esteban Aliverti wrote:
Hi guys,
I was writing some rules using backward chaining and found a strange
behavior.
I managed to isolate the error in the test project I'm attaching.
In the project I have 2 classes: Parent and Child
Parent:
* String id
* String attribute1
* String attribute2
* List<Child> children
Child:
* String parentId;
* String name;
* String value;
In the test I'm creating 1 Parent object with just 1 child and then
inserting the Parent object into a drools session:
Parent p1 = new Parent();
p1.setId("1");
p1.setAttribute1("a1");
p1.setAttribute2(null);
Child c1p1 = new Child();
c1p1.setName("n1");
c1p1.setParentId(p1.getId());
c1p1.setValue("v1.1");
p1.addChild(c1p1);
kSession.insert(p1);
kSession.fireAllRules();
So far so good.
The rules I have in my session are the following:
declare Parent
@propertyReactive
end
query getChildWithName(String $parentId, String $name, Child $child)
$child:= Child(parentId == $parentId, name == $name)
end
rule "Insert Children"
when
$p: Parent() @watch(!*)
$c: Child() from $p.children
then
System.out.println("Inserting child "+$c);
insert($c);
end
rule "Rule A"
when
$p: Parent(attribute2 != null)
?getChildWithName($p.attribute2, "n1", $child;)
then
System.out.println("FOUND: "+$child+". The attribute
'parentId' of
this object must have the value '"+$p.getAttribute2()+"'. Does it?
"+$child.getParentId()+" == "+$p.getAttribute2()+" ??");
globalList.add($child);
end
rule "Copy Attribute1 into Attribute2"
when
$p: Parent(attribute1 != null, attribute2 == null)
then
modify($p){
setAttribute2($p.getAttribute1())
}
end
The important part here is 'Rule A' and 'Copy Attribute1 into
Attribute2'. The latter copies the value of attribute1 to attribute2
for any Parent object present in the session. (Note that the parent
I'm inserting has attribute2 = null). 'Rule A' is then using a query
to get a Child object that has a parent with id = $p.attribute2 (where
$p is a previously matched Parent).
Given that I only have 1 Parent in my session and that its id is '1' I
don't expect 'Rule A' to be activated/executed. When I modify
parent.attribute2 in 'Copy Attribute1 into Attribute2' I'm setting its
value to 'a1'. 'Rule A' (via the query) should then look for a Child
with parentid = 'a1' and It shouldn't find anything.
Funny thing is that 'Rule A' activates and fires. The child object
that is 'returned' by the query has a parentId of '1' so I don't
know
how this behavior is possible. If you take a look at the System.out
output you will see that the activation makes no sense at all.
Am I doing something wrong in my project? Is this a bug? Is this the
expected behavior?
Regards,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Blog @ http://ilesteban.wordpress.com
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
9 a.m.
Good catch Davide. I can confirm that not using nested accessors the query
works as expected.
Regards,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Blog @ http://ilesteban.wordpress.com
On Wed, Jan 22, 2014 at 6:57 PM, Davide Sottara <dsotty(a)gmail.com> wrote:
Indeed, the use case can be simplified further:
package org.drools.test.bc;
declare Parent
attribute2 : String
end
declare Child
parentId : String
end
query getChildWithName( String $parentId, Child $child )
$child:= Child( parentId == $parentId )
end
rule "Insert Children"
when
then
Parent p1 = new Parent( "a1" );
Child c1p1 = new Child( "1" );
insert( c1p1 );
insert( p1 );
end
rule "Rule A"
when
$p: Parent( $a2 : attribute2 )
?getChildWithName( $p.attribute2, $child;)
then
System.out.println("FOUND: "+ $child + " >> " +
$child.getParentId() +
" == " + $p.getAttribute2() + " ??" );
end
It has nothing to do with nested objects, @PR or modifications.
It seems that the culprit is the chained property accessor.
Davide
On 01/22/2014 02:22 PM, Esteban Aliverti wrote:
Hi guys,
I was writing some rules using backward chaining and found a strange
behavior.
I managed to isolate the error in the test project I'm attaching.
In the project I have 2 classes: Parent and Child
Parent:
* String id
* String attribute1
* String attribute2
* List<Child> children
Child:
* String parentId;
* String name;
* String value;
In the test I'm creating 1 Parent object with just 1 child and then
inserting the Parent object into a drools session:
Parent p1 = new Parent();
p1.setId("1");
p1.setAttribute1("a1");
p1.setAttribute2(null);
Child c1p1 = new Child();
c1p1.setName("n1");
c1p1.setParentId(p1.getId());
c1p1.setValue("v1.1");
p1.addChild(c1p1);
kSession.insert(p1);
kSession.fireAllRules();
So far so good.
The rules I have in my session are the following:
declare Parent
@propertyReactive
end
query getChildWithName(String $parentId, String $name, Child $child)
$child:= Child(parentId == $parentId, name == $name)
end
rule "Insert Children"
when
$p: Parent() @watch(!*)
$c: Child() from $p.children
then
System.out.println("Inserting child "+$c);
insert($c);
end
rule "Rule A"
when
$p: Parent(attribute2 != null)
?getChildWithName($p.attribute2, "n1", $child;)
then
System.out.println("FOUND: "+$child+". The attribute
'parentId' of
this object must have the value '"+$p.getAttribute2()+"'. Does it?
"+$child.getParentId()+" == "+$p.getAttribute2()+" ??");
globalList.add($child);
end
rule "Copy Attribute1 into Attribute2"
when
$p: Parent(attribute1 != null, attribute2 == null)
then
modify($p){
setAttribute2($p.getAttribute1())
}
end
The important part here is 'Rule A' and 'Copy Attribute1 into
Attribute2'. The latter copies the value of attribute1 to attribute2 for
any Parent object present in the session. (Note that the parent I'm
inserting has attribute2 = null). 'Rule A' is then using a query to get a
Child object that has a parent with id = $p.attribute2 (where $p is a
previously matched Parent).
Given that I only have 1 Parent in my session and that its id is '1' I
don't expect 'Rule A' to be activated/executed. When I modify
parent.attribute2 in 'Copy Attribute1 into Attribute2' I'm setting its
value to 'a1'. 'Rule A' (via the query) should then look for a Child
with
parentid = 'a1' and It shouldn't find anything.
Funny thing is that 'Rule A' activates and fires. The child object that is
'returned' by the query has a parentId of '1' so I don't know how
this
behavior is possible. If you take a look at the System.out output you will
see that the activation makes no sense at all.
Am I doing something wrong in my project? Is this a bug? Is this the
expected behavior?
Regards,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Blog @ http://ilesteban.wordpress.com
_______________________________________________
rules-users mailing
listrules-users@lists.jboss.orghttps://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
12:18 p.m.
Esteban, I have created a ticket for this with
an explanation of the weird behavior.
https://issues.jboss.org/browse/DROOLS-414
The problem is in QueryElementBuilder line#343.
It's an easy fix but I don't have time for it right now,
could someone look into it?
Thanks
Davide
On 01/22/2014 06:00 PM, Esteban Aliverti wrote:
Good catch Davide. I can confirm that not using nested accessors the
query works as expected.
Regards,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Blog @ http://ilesteban.wordpress.com
On Wed, Jan 22, 2014 at 6:57 PM, Davide Sottara <dsotty(a)gmail.com
<mailto:dsotty@gmail.com>> wrote:
Indeed, the use case can be simplified further:
package org.drools.test.bc;
declare Parent
attribute2 : String
end
declare Child
parentId : String
end
query getChildWithName( String $parentId, Child $child )
$child:= Child( parentId == $parentId )
end
rule "Insert Children"
when
then
Parent p1 = new Parent( "a1" );
Child c1p1 = new Child( "1" );
insert( c1p1 );
insert( p1 );
end
rule "Rule A"
when
$p: Parent( $a2 : attribute2 )
?getChildWithName( $p.attribute2, $child;)
then
System.out.println("FOUND: "+ $child + " >> " +
$child.getParentId() + " == " + $p.getAttribute2() + " ??" );
end
It has nothing to do with nested objects, @PR or modifications.
It seems that the culprit is the chained property accessor.
Davide
On 01/22/2014 02:22 PM, Esteban Aliverti wrote:
> Hi guys,
> I was writing some rules using backward chaining and found a
> strange behavior.
> I managed to isolate the error in the test project I'm attaching.
>
> In the project I have 2 classes: Parent and Child
>
> Parent:
> * String id
> * String attribute1
> * String attribute2
> * List<Child> children
>
> Child:
> * String parentId;
> * String name;
> * String value;
>
>
> In the test I'm creating 1 Parent object with just 1 child and
> then inserting the Parent object into a drools session:
>
> Parent p1 = new Parent();
> p1.setId("1");
> p1.setAttribute1("a1");
> p1.setAttribute2(null);
>
> Child c1p1 = new Child();
> c1p1.setName("n1");
> c1p1.setParentId(p1.getId());
> c1p1.setValue("v1.1");
> p1.addChild(c1p1);
>
> kSession.insert(p1);
> kSession.fireAllRules();
>
>
> So far so good.
> The rules I have in my session are the following:
>
> declare Parent
> @propertyReactive
> end
>
> query getChildWithName(String $parentId, String $name, Child $child)
> $child:= Child(parentId == $parentId, name == $name)
> end
>
> rule "Insert Children"
> when
> $p: Parent() @watch(!*)
> $c: Child() from $p.children
> then
> System.out.println("Inserting child "+$c);
> insert($c);
> end
>
> rule "Rule A"
> when
> $p: Parent(attribute2 != null)
> ?getChildWithName($p.attribute2, "n1", $child;)
> then
> System.out.println("FOUND: "+$child+". The attribute
> 'parentId' of this object must have the value
> '"+$p.getAttribute2()+"'. Does it?
"+$child.getParentId()+" ==
> "+$p.getAttribute2()+" ??");
> globalList.add($child);
> end
>
>
> rule "Copy Attribute1 into Attribute2"
> when
> $p: Parent(attribute1 != null, attribute2 == null)
> then
> modify($p){
> setAttribute2($p.getAttribute1())
> }
> end
>
> The important part here is 'Rule A' and 'Copy Attribute1 into
> Attribute2'. The latter copies the value of attribute1 to
> attribute2 for any Parent object present in the session. (Note
> that the parent I'm inserting has attribute2 = null). 'Rule A' is
> then using a query to get a Child object that has a parent with
> id = $p.attribute2 (where $p is a previously matched Parent).
> Given that I only have 1 Parent in my session and that its id is
> '1' I don't expect 'Rule A' to be activated/executed. When I
> modify parent.attribute2 in 'Copy Attribute1 into Attribute2' I'm
> setting its value to 'a1'. 'Rule A' (via the query) should then
> look for a Child with parentid = 'a1' and It shouldn't find
> anything.
> Funny thing is that 'Rule A' activates and fires. The child
> object that is 'returned' by the query has a parentId of '1' so
I
> don't know how this behavior is possible. If you take a look at
> the System.out output you will see that the activation makes no
> sense at all.
>
> Am I doing something wrong in my project? Is this a bug? Is this
> the expected behavior?
>
> Regards,
>
>
>
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Esteban Aliverti
> - Blog @ http://ilesteban.wordpress.com
>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
> https://lists.jboss.org/mailman/listinfo/rules-users
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org <mailto:rules-users@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
9:15 p.m.
Let me see what I can do.
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Blog @ http://ilesteban.wordpress.com
On Thu, Jan 23, 2014 at 12:18 AM, Davide Sottara <dsotty(a)gmail.com> wrote:
Esteban, I have created a ticket for this with
an explanation of the weird behavior.
https://issues.jboss.org/browse/DROOLS-414
The problem is in QueryElementBuilder line#343.
It's an easy fix but I don't have time for it right now,
could someone look into it?
Thanks
Davide
On 01/22/2014 06:00 PM, Esteban Aliverti wrote:
Good catch Davide. I can confirm that not using nested accessors the query
works as expected.
Regards,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Blog @ http://ilesteban.wordpress.com
On Wed, Jan 22, 2014 at 6:57 PM, Davide Sottara <dsotty(a)gmail.com> wrote:
> Indeed, the use case can be simplified further:
>
> package org.drools.test.bc;
>
> declare Parent
> attribute2 : String
> end
>
> declare Child
> parentId : String
> end
>
> query getChildWithName( String $parentId, Child $child )
> $child:= Child( parentId == $parentId )
>
> end
>
> rule "Insert Children"
> when
> then
> Parent p1 = new Parent( "a1" );
> Child c1p1 = new Child( "1" );
>
> insert( c1p1 );
> insert( p1 );
>
> end
>
> rule "Rule A"
> when
> $p: Parent( $a2 : attribute2 )
> ?getChildWithName( $p.attribute2, $child;)
> then
> System.out.println("FOUND: "+ $child + " >> " +
$child.getParentId()
> + " == " + $p.getAttribute2() + " ??" );
> end
>
> It has nothing to do with nested objects, @PR or modifications.
> It seems that the culprit is the chained property accessor.
>
>
> Davide
>
>
>
> On 01/22/2014 02:22 PM, Esteban Aliverti wrote:
>
> Hi guys,
> I was writing some rules using backward chaining and found a strange
> behavior.
> I managed to isolate the error in the test project I'm attaching.
>
> In the project I have 2 classes: Parent and Child
>
> Parent:
> * String id
> * String attribute1
> * String attribute2
> * List<Child> children
>
> Child:
> * String parentId;
> * String name;
> * String value;
>
>
> In the test I'm creating 1 Parent object with just 1 child and then
> inserting the Parent object into a drools session:
>
> Parent p1 = new Parent();
> p1.setId("1");
> p1.setAttribute1("a1");
> p1.setAttribute2(null);
>
> Child c1p1 = new Child();
> c1p1.setName("n1");
> c1p1.setParentId(p1.getId());
> c1p1.setValue("v1.1");
> p1.addChild(c1p1);
>
> kSession.insert(p1);
> kSession.fireAllRules();
>
>
> So far so good.
> The rules I have in my session are the following:
>
> declare Parent
> @propertyReactive
> end
>
> query getChildWithName(String $parentId, String $name, Child $child)
> $child:= Child(parentId == $parentId, name == $name)
> end
>
> rule "Insert Children"
> when
> $p: Parent() @watch(!*)
> $c: Child() from $p.children
> then
> System.out.println("Inserting child "+$c);
> insert($c);
> end
>
> rule "Rule A"
> when
> $p: Parent(attribute2 != null)
> ?getChildWithName($p.attribute2, "n1", $child;)
> then
> System.out.println("FOUND: "+$child+". The attribute
'parentId' of
> this object must have the value '"+$p.getAttribute2()+"'. Does it?
> "+$child.getParentId()+" == "+$p.getAttribute2()+" ??");
> globalList.add($child);
> end
>
>
> rule "Copy Attribute1 into Attribute2"
> when
> $p: Parent(attribute1 != null, attribute2 == null)
> then
> modify($p){
> setAttribute2($p.getAttribute1())
> }
> end
>
> The important part here is 'Rule A' and 'Copy Attribute1 into
> Attribute2'. The latter copies the value of attribute1 to attribute2 for
> any Parent object present in the session. (Note that the parent I'm
> inserting has attribute2 = null). 'Rule A' is then using a query to get a
> Child object that has a parent with id = $p.attribute2 (where $p is a
> previously matched Parent).
> Given that I only have 1 Parent in my session and that its id is '1' I
> don't expect 'Rule A' to be activated/executed. When I modify
> parent.attribute2 in 'Copy Attribute1 into Attribute2' I'm setting its
> value to 'a1'. 'Rule A' (via the query) should then look for a Child
with
> parentid = 'a1' and It shouldn't find anything.
> Funny thing is that 'Rule A' activates and fires. The child object that
> is 'returned' by the query has a parentId of '1' so I don't know
how this
> behavior is possible. If you take a look at the System.out output you will
> see that the activation makes no sense at all.
>
> Am I doing something wrong in my project? Is this a bug? Is this the
> expected behavior?
>
> Regards,
>
>
>
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Esteban Aliverti
> - Blog @ http://ilesteban.wordpress.com
>
>
> _______________________________________________
> rules-users mailing
listrules-users@lists.jboss.orghttps://lists.jboss.org/mailman/listinfo/rules-users
>
>
>
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10:24 p.m.
Ok, I think I have a fix already in place. I'll add a test in MiscTest
(drools-compiler) and create a Pull Request.
Regards,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Blog @ http://ilesteban.wordpress.com
On Thu, Jan 23, 2014 at 9:15 AM, Esteban Aliverti <
esteban.aliverti(a)gmail.com> wrote:
Let me see what I can do.
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Blog @ http://ilesteban.wordpress.com
On Thu, Jan 23, 2014 at 12:18 AM, Davide Sottara <dsotty(a)gmail.com> wrote:
> Esteban, I have created a ticket for this with
> an explanation of the weird behavior.
>
> https://issues.jboss.org/browse/DROOLS-414
>
> The problem is in QueryElementBuilder line#343.
> It's an easy fix but I don't have time for it right now,
> could someone look into it?
>
> Thanks
> Davide
>
>
>
> On 01/22/2014 06:00 PM, Esteban Aliverti wrote:
>
> Good catch Davide. I can confirm that not using nested accessors the
> query works as expected.
>
> Regards,
>
>
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Esteban Aliverti
> - Blog @ http://ilesteban.wordpress.com
>
>
> On Wed, Jan 22, 2014 at 6:57 PM, Davide Sottara <dsotty(a)gmail.com> wrote:
>
>> Indeed, the use case can be simplified further:
>>
>> package org.drools.test.bc;
>>
>> declare Parent
>> attribute2 : String
>> end
>>
>> declare Child
>> parentId : String
>> end
>>
>> query getChildWithName( String $parentId, Child $child )
>> $child:= Child( parentId == $parentId )
>>
>> end
>>
>> rule "Insert Children"
>> when
>> then
>> Parent p1 = new Parent( "a1" );
>> Child c1p1 = new Child( "1" );
>>
>> insert( c1p1 );
>> insert( p1 );
>>
>> end
>>
>> rule "Rule A"
>> when
>> $p: Parent( $a2 : attribute2 )
>> ?getChildWithName( $p.attribute2, $child;)
>> then
>> System.out.println("FOUND: "+ $child + " >> " +
$child.getParentId()
>> + " == " + $p.getAttribute2() + " ??" );
>> end
>>
>> It has nothing to do with nested objects, @PR or modifications.
>> It seems that the culprit is the chained property accessor.
>>
>>
>> Davide
>>
>>
>>
>> On 01/22/2014 02:22 PM, Esteban Aliverti wrote:
>>
>> Hi guys,
>> I was writing some rules using backward chaining and found a strange
>> behavior.
>> I managed to isolate the error in the test project I'm attaching.
>>
>> In the project I have 2 classes: Parent and Child
>>
>> Parent:
>> * String id
>> * String attribute1
>> * String attribute2
>> * List<Child> children
>>
>> Child:
>> * String parentId;
>> * String name;
>> * String value;
>>
>>
>> In the test I'm creating 1 Parent object with just 1 child and then
>> inserting the Parent object into a drools session:
>>
>> Parent p1 = new Parent();
>> p1.setId("1");
>> p1.setAttribute1("a1");
>> p1.setAttribute2(null);
>>
>> Child c1p1 = new Child();
>> c1p1.setName("n1");
>> c1p1.setParentId(p1.getId());
>> c1p1.setValue("v1.1");
>> p1.addChild(c1p1);
>>
>> kSession.insert(p1);
>> kSession.fireAllRules();
>>
>>
>> So far so good.
>> The rules I have in my session are the following:
>>
>> declare Parent
>> @propertyReactive
>> end
>>
>> query getChildWithName(String $parentId, String $name, Child $child)
>> $child:= Child(parentId == $parentId, name == $name)
>> end
>>
>> rule "Insert Children"
>> when
>> $p: Parent() @watch(!*)
>> $c: Child() from $p.children
>> then
>> System.out.println("Inserting child "+$c);
>> insert($c);
>> end
>>
>> rule "Rule A"
>> when
>> $p: Parent(attribute2 != null)
>> ?getChildWithName($p.attribute2, "n1", $child;)
>> then
>> System.out.println("FOUND: "+$child+". The attribute
'parentId' of
>> this object must have the value '"+$p.getAttribute2()+"'. Does
it?
>> "+$child.getParentId()+" == "+$p.getAttribute2()+"
??");
>> globalList.add($child);
>> end
>>
>>
>> rule "Copy Attribute1 into Attribute2"
>> when
>> $p: Parent(attribute1 != null, attribute2 == null)
>> then
>> modify($p){
>> setAttribute2($p.getAttribute1())
>> }
>> end
>>
>> The important part here is 'Rule A' and 'Copy Attribute1 into
>> Attribute2'. The latter copies the value of attribute1 to attribute2 for
>> any Parent object present in the session. (Note that the parent I'm
>> inserting has attribute2 = null). 'Rule A' is then using a query to get
a
>> Child object that has a parent with id = $p.attribute2 (where $p is a
>> previously matched Parent).
>> Given that I only have 1 Parent in my session and that its id is '1' I
>> don't expect 'Rule A' to be activated/executed. When I modify
>> parent.attribute2 in 'Copy Attribute1 into Attribute2' I'm setting
its
>> value to 'a1'. 'Rule A' (via the query) should then look for a
Child with
>> parentid = 'a1' and It shouldn't find anything.
>> Funny thing is that 'Rule A' activates and fires. The child object that
>> is 'returned' by the query has a parentId of '1' so I don't
know how this
>> behavior is possible. If you take a look at the System.out output you will
>> see that the activation makes no sense at all.
>>
>> Am I doing something wrong in my project? Is this a bug? Is this the
>> expected behavior?
>>
>> Regards,
>>
>>
>>
>> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>>
>> Esteban Aliverti
>> - Blog @ http://ilesteban.wordpress.com
>>
>>
>> _______________________________________________
>> rules-users mailing
listrules-users@lists.jboss.orghttps://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
>>
>
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6 comments
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participants (2)
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Davide Sottara -
Esteban Aliverti