Re: [rules-users] Buggy query behavior in drools 5.6 and 6.1-SNAPSHOT ??

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