[rules-users] BRMS - how to use variables on Action part?

[Shahad Ahmed]

Hi Felipe,

When you define your LHS in the BRMS, there is an option to assign a
variable to the expression. In the When part, there should be a little green
triangle beside Person. Click on this to get a dialog called "Modify
constraints for Person". At the bottom of this dialog is an option to set a
variable name to bind to Person. Type p, or whatever you want into the text
box and then click the Set button beside the text box. You should now have a
LHS constraint of the form p:Person(...). Now create a Then action by
clicking the + at the RHS of the Then part. A dialog will appear called "Add
a new action". The first two option allows you to pick the variable p you
just created - you probably want the second option of "modify a fact" as you
want to call update(p) after modifying p. You should now see something like
Set [p] in the Then part. Click on the Green triangle above Set [p] and you
will get a dialog called "Add a field" with a list of the fields in the
Person class. Choose the one you want to set (approvedMount?). What this
does is actually call the method called setApprovedMount (Press View Source
button to see). The Set action should now have a text box where you can
enter the parameter $income * 1.2.

I've had a look at the source code for this functionality and it only allows
Setter methods to be called - unfortunately you cannot call any other
methods on Person.

Regards
Shahad



On 10/3/07, Felipe Piccolini <felipe.piccolini at bluesoft.cl> wrote:
>
>  Ok, so to fit on the "not ignored emails" from the list Mark posted, I
> changed the title. However I following in the list
> anyways beacuse Im resending this email in less than 3 days.
>
>
> Note: Im not desperate, nor this is for today. This just came out today
> yesterday and well... its important to me, but I
> think I can get a work around for now.
>
>
> So here is the real on-topic question.
> -----------------
> Anyone knows how to use variables (from fields) setted on LHS, to modify a
> field on the RHS using the GUI editor
> from BRMS?
>
>
> What I need is to write this rule on BRMS.
>
>
> rule "Set approvedMount for a women"
> no-loop true
> when
> $p: Person($sex: sex == "F", $income: incomeMount)
> then
> $p.setApprovedMount($income * 1.2);
> update($p);
> end
>
>
> I know I can use formulas, but I only know how to set those on LHS, I dont
> know how to put a formula on RHS (setter of the field to modify).
>
>
> Thanks.
>
>
> *Felipe Piccolini M.*
> felipe.piccolini at bluesoft.cl
>
>
>
>
>
>
>
>
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