[rules-users] How to create nested rules in Drool Guvnor

[Michael Rhoden]

You can do this using the "extends" keyword in your rule. 



Rule "shopping cart total exceeds 4000, give 50% discount" 
       when 
         <condition> 
       then 
         <action>        
end 



Rule "if order between 6 to 9 pm give additional discount of 20 %" extends "shopping cart total exceeds 4000, give 50% discount" 

       when 
               <condition> 
       then 
               <action> 
end 



You can also disable the first rule and just use "extends" to limit the amount of duplicate conditions in your rules. Note extends basically copies the conditions from the first rule to what is being extended, but I believe it will do what you are trying to do. 



Michael Rhoden 
VP - IT Development 
Franklin American Mortgage Company 
Direct: 615-778-1117 
Fax: 615-778-2766 
Email: mrhoden at franklinamerican.com 

----- Original Message ----- 
From: "Pardeep Ruhil" <Pardeep.Ruhil at lntinfotech.com> 
To: rules-users at lists.jboss.org 
Sent: Wednesday, August 12, 2009 2:44:38 PM GMT -06:00 US/Canada Central 
Subject: [rules-users] How to create nested rules in Drool Guvnor 


Hi, 
Thanks for replying. 

I have a scenario like 
Rule "shopping cart total exceeds 4000, give 50% discount" 
       when 
         <condition> 
       then 
         <action> 
         call Rule"if order is  between 6 to 9 pm, give additional 
discount of 20 %" 
end 
Rule "if order between 6 to 9 pm give additional discount of 20 %" 
       when 
               <condition> 
       then 
               <action> 
end 

.............. 
Also i have a  query like, Can we make rule like this 

Rule "shopping cart total exceeds 4000 give 50% discount" 
       when 
               <condition> 
       then 
               <action> 

               Rule "if order between 6 to 9 pm give additional discount 
of 20 %" 
                       when 
                               <condition> 
                       then 
                               <action> 
               end 
end 

Can we make rules like above? 



Thanks & Regards 

Pardeep Ruhil 
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