2011/7/6 Michael Anstis <michael.anstis@gmail.com>

Guvnor provides for the means to author rules, not consume them.

There's no capabilities to insert your objects (other than when writing test scenarios for your rules). This would be the realm of KnowledgeSessions and *your* application.

If however you want your application (you do state "...in our web frontend") to be able to retrieve either a list of objects or a single one depending on whether the ID is provided then:-

(a) I'd have thought you could simply achieve this without using a Rule Engine

(b) If you want to use a rule engine then: insert all YourObjects into Working Memory and use Drools Queries to achieve your need with queries a bit like these:-

query "all objects"
$l : ArrayList( ) from collect( YourObject( ) )
end

query "an objects" (int $id )
$l : YourObject( id == $id )
end

Have I missed your point?

2011/7/6 Wolfgang Laun <wolfgang.laun@gmail.com>

I suspected something like that, but matching facts of type System from Working Memory and inserting recreated facts of the same type isn't going to get them nearer to the GUI?

-W

On 6 July 2011 13:10, _bart <dgrundler@doubleslash.de> wrote:
Ok I will describe it again:

We want to administrate some objects in guvnor. Every object has one id, one
name and one description. We have round about 100 objects.

One use case is, that all objects (id, name and description) should be
displayed in a drop down box in our web frontend.
The next use case is, that it has to be possible to load one object (id,
name, decription) by id.

My solution in pseudo code for the rule is:

IF id IS SET search object and return it or return null if not exist.
IF ID IS NOT SET return all objects.

So I need a rule for these requirements. The rule above returns the object
specified by id correctly (the id will be set with id $system.getId()).
Also the rule above returns all objects from the data table. But the id is
missing in every object.

I hope it is clear now.
Maybe my approach is wrong?

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