[rules-users] Guvnor LHS and RHS questions

[Minh Huon]

  Look at screen shot for questions 1 and 2




UI is a little screwy but you can check for null.

As for question 3, if you look at the source of your drl, you'll see if 
you have a named reference to your object if not, you cannot use it on 
the right hand side.  If you look at my rule, I'm setting the contents 
of *override *to *resultNumberToPick *which is what I think your trying 
to accomplish.

hth

Minh


On 10/7/2010 2:15 PM, Dean Whisnant wrote:
>
> Hello,
>
> I've only been working with Drools for a little over a month or so now 
> and I've begun integrating it into my application via Eclipse and 
> creating DRL files.  The nature of this application is to take a data 
> record from one file and create a new data record in another file.  
> This is done in a batch of any number of records, depending on the 
> number of records sent to us in the first file. To accomplish this I 
> have two classes, one representing each file, and I create and object 
> for each of them, inserting them into the knowledge session and then 
> fire the rule.
>
>                 ksession.insert(myObjectIn);
>
>                 ksession.insert(myObjectOut);
>
>                 ksession.fireAllRules();
>
> The first object has around 1,000 fields and the second has 250, so my 
> class structure is quite broad.
>
> In a DRL file I have created the following rule:
>
> *rule* "Primary Diagnosis Code"
>
> *when*
>
>            $ccl : anObjectIn(IncomingDiag1 != *null*)
>
>            $cdl  : anObjectOut()
>
> *then*
>
>            $cdl.PrimaryDiag = $ccl.IncomingDiag1;
>
> *end*
>
> This rule fires great and the PrimaryDiag field in myObjectOut is 
> updated with what iss in myObjectIn.IncomingDiag.  I can then write 
> the object back out the the database fine.
>
> A requirement of my project is that I allow users (analysts) to create 
> their own rules that are above and beyond those I might create in a 
> .drl file. To do so we are looking to deploy Guvnor and let them use 
> the Guided editor to create rules.  I've already loaded my fact models 
> into Guvnor and have them available in the drop down conditions.
>
> The questions that are hitting me now are:
>
> 1) On the LHS when I've chosen the fiels IncomingDiag the only options 
> I have for conditions are "equal to", "not equal to", "matches", and 
> "sounds like". I don't see an option for null or notnull. If I were to 
> choose "not equal to" I then have the options for Literal Values, New 
> Formulas, or Expression Editor (which has none by default).  I haven't 
> seen any examples where someone is evaluating a field in Guvnor for 
> being either "" or null.  How would one accomplish this?  The literal 
> value does not allow you to leave it blank as in "" and if you type "" 
> in it, the source shows """".
>
> 2) On the LHS, if I were to want to evaluate IncomingDiag1 == 
> IncomingDiag2 I don't see a method except if I were to choose New 
> Formula and type in the field name Incoming Diag2.  Is there another 
> way that they could be prompted for the field choises again?
>
> 3) On the RHS, when I go to add a new then, I'm prompted to choose 
> only to either "insert fact anObjectIn" or to "logically insert fact 
> anObjectIn" or to manually enter DRL logic.  Both of the inserts 
> appear to create logic that would create a new object with the data in it:
>
> anObjectIn fact0 = new anObjectIn ();
>
> fact0. IncomingDiag1 ( 11 );
>
> insertLogical(fact0 );
>
>         But what I really want is something similar to my DRL from 
> above.  Am I missing something?  Or would this have to be a case where 
> they would manually enter the DRL statement?
>
> Thank you!
>
> Dean Whisnant
>
> Senior Software Developer
>
> basys, inc.
>
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20101007/21ce20a7/attachment.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: moz-screenshot.png
Type: image/png
Size: 92091 bytes
Desc: not available
Url : http://lists.jboss.org/pipermail/rules-users/attachments/20101007/21ce20a7/attachment.png