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

[Esteban Aliverti]

Let me see what I can do.


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Esteban Aliverti
- Blog @ http://ilesteban.wordpress.com


On Thu, Jan 23, 2014 at 12:18 AM, Davide Sottara <dsotty at 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 at 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
>>
>>
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>>
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