9:28 a.m.
Hello,
I'm pretty new to Drools hence i apologize if my question is newbie but i'm
getting crazy.
I'm trying to write a functioning query since yesterday without fortune.
I have data about vehicles owned by person organized for year. My structure
is:
VechicleData
|___VehicleYearData
|____Vehicle
I have inserted in Drools only the root of the hierarchy (VehicleData)
because insert all objects has been problematic for me. Now i need to check
if a person has all vehicle of the same make.
I have tried this:
$result: PersonData( $id: identifierCode )
forall
(
($o: VehicleData( ownerIdentifierCode == $result.identifierCode )) &&
($y: VehicleYearData( ) from $o.data) &&
($v: VehicleEntity( ) from $y.vehicleEntity)
)
VehicleEntity( this == $v, make == "BMW" )
)
and this:
PersonData( $id: identifierCode )
$list: List( ) from accumulate (
(and
$o: VehicleData( ownerIdentifierCode == $id )
$y: VehicleYearData( ) from $o.data
$e: VehicleEntity( ) from $y.vehicleEntity
),
collectList( $e )
)
forall (
$v: VehicleEntity( ) from $list
VehicleEntity( this == $v, make == "BMW" )
)
and many other...
Someone can help me??
Thank you.
Andrea
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9:49 a.m.
Hi,
I am not sure, what you try to achieve.
You have a person and you want find out, whether all of his vehicles are
of only one make?
rule "Do Stuff If Person Has Vehicles Of Only One Make"
when
PersonData( $id:identifierCode)
accumulate(
VehicleData(
ownerIdentifierCode == $id
,$y:VehicleYearData()
)
and $v: VehicleEntity() from $y
,$vehicles:collectSet($v.make)
,$vehicles.size==1
)
then
// has of the same make, do action
end
Didn't test it, but it should work. I used similar solution once. If
make field is String it is fine, if anything else, you have to overload
the equals and hashCode methods.
Hope that helps
Jan
Dne 14.5.2014 15:28, braveheart85 napsal(a):
Hello,
I'm pretty new to Drools hence i apologize if my question is newbie but i'm
getting crazy.
I'm trying to write a functioning query since yesterday without fortune.
I have data about vehicles owned by person organized for year. My structure
is:
VechicleData
|___VehicleYearData
|____Vehicle
I have inserted in Drools only the root of the hierarchy (VehicleData)
because insert all objects has been problematic for me. Now i need to check
if a person has all vehicle of the same make.
I have tried this:
$result: PersonData( $id: identifierCode )
forall
(
($o: VehicleData( ownerIdentifierCode == $result.identifierCode )) &&
($y: VehicleYearData( ) from $o.data) &&
($v: VehicleEntity( ) from $y.vehicleEntity)
)
VehicleEntity( this == $v, make == "BMW" )
)
and this:
PersonData( $id: identifierCode )
$list: List( ) from accumulate (
(and
$o: VehicleData( ownerIdentifierCode == $id )
$y: VehicleYearData( ) from $o.data
$e: VehicleEntity( ) from $y.vehicleEntity
),
collectList( $e )
)
forall (
$v: VehicleEntity( ) from $list
VehicleEntity( this == $v, make == "BMW" )
)
and many other...
Someone can help me??
Thank you.
Andrea
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View this message in context:
http://drools.46999.n3.nabble.com/forall-with-nested-collections-tp402957...
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10:09 a.m.
The hierarchical data model is rather unwieldy.
A relational model would have the following entities:
Person( personId,... )
Vehicle( vehicleId, make,... )
Ownership( personId, vehicleId, year )
and it would be quite easy to handle such questions:
Person( $pid: persondId)
Ownership( personId == $pid, $vid1: vehicleId )
Vechicle( vehicleId == $vid1. $make1: make )
not ( Ownership( personId == $pid, $vid2: vehicleId != $vid1 )
and
Vehicle( vehicleId == $vid2, make != $make1 ) )
That said, here's some code to do it in Drools:
$result: PersonData( $id: identifierCode )
Set( count == 1 )
from accumulate( $vd: VehicleData( ownerIdentifierCode ==
$result.identifierCode )
init( Set ms = new HashSet() ),
action( forall( VehicleYearData vyd: $vd.getData() ){
forall( VehicleEntity ve: vyd.getVehicleEntity() ){
ms.add( ve.getMake() );
}
} ),
result( ms ) )
The rule should fire if that person owns cars of just one make; use >1
for the opposite condition.
Untested!
-W
On 14/05/2014, braveheart85 <andrea.pacifico.85(a)gmail.com> wrote:
Hello,
I'm pretty new to Drools hence i apologize if my question is newbie but i'm
getting crazy.
I'm trying to write a functioning query since yesterday without fortune.
I have data about vehicles owned by person organized for year. My structure
is:
VechicleData
|___VehicleYearData
|____Vehicle
I have inserted in Drools only the root of the hierarchy (VehicleData)
because insert all objects has been problematic for me. Now i need to check
if a person has all vehicle of the same make.
I have tried this:
$result: PersonData( $id: identifierCode )
forall
(
($o: VehicleData( ownerIdentifierCode == $result.identifierCode )) &&
($y: VehicleYearData( ) from $o.data) &&
($v: VehicleEntity( ) from $y.vehicleEntity)
)
VehicleEntity( this == $v, make == "BMW" )
)
and this:
PersonData( $id: identifierCode )
$list: List( ) from accumulate (
(and
$o: VehicleData( ownerIdentifierCode == $id )
$y: VehicleYearData( ) from $o.data
$e: VehicleEntity( ) from $y.vehicleEntity
),
collectList( $e )
)
forall (
$v: VehicleEntity( ) from $list
VehicleEntity( this == $v, make == "BMW" )
)
and many other...
Someone can help me??
Thank you.
Andrea
--
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http://drools.46999.n3.nabble.com/forall-with-nested-collections-tp402957...
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10:55 a.m.
Thank you for the fast response.
Laun you are right obviously, but i'm developing an addon module and i have
not partecipated in the design of the data structures. I could implement an
adaptation layer, but i haven't much time.
Thank you again, you are very helpful! I'm going to try the solutions.
Andrea
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3640
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3640
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3 comments
3 participants
participants (3)
-
braveheart85 -
Jan Šťastný -
Wolfgang Laun