[rules-users] Using Collections in LHS

[dhari]

Thanks Jeffery. 
I'll try this but what if I have more complex condition e.g. 



Order ($discount : discount, $items : items)

Item(grade > 3 && (quantity < 5 || $discount > 10)) from $items


Date: Tue, 23 Feb 2010 15:14:18 -0800
From: ml-node+412055-2130217977-80541 at n3.nabble.com
To: sdhari at hotmail.com
Subject: Re: Using Collections in LHS



















I think what you are looking for is the following.  Someone
please correct me if I am incorrect.

 

when

Order($discount : discount
> 10, $items: items)

Item(grade > 3) from
$items

then

System.err.print(“Discount is not
allowed with items having grade 3 or higher”);

 

 

This would fire when an Order has a discount greater than 10 and
an  item with a grade greater than 3.

Not sure why you even need the $discount variable.  You
could just do Order(discount > 10, $items : items) for the first line of the
when clause.

 

 





From:
[hidden email]
[mailto:[hidden email]] On Behalf Of Shabbir Dhari

Sent: Tuesday, February 23, 2010 5:27 PM

To: [hidden email]

Subject: Re: [rules-users] Using Collections in LHS





 

Hi W



I know about case sensitivity issue. How can I combine both Order and Item in
one condition. I tried all possibilities but getting syntax error.



For example: 

Order ($items : items, $discount : discount > 10,
Item(grade > 3) from $items) // gives error

 

Can please code this condition correctly for me?

 

Dhari

 







Date: Tue, 23 Feb 2010 13:43:01 +0100

From: [hidden email]

To: [hidden email]

Subject: Re: [rules-users] Using Collections in LHS



Discount is a field of Order and must not appear in an Item(...).

Probably you want:

   Order  ( $discount : Discount > 10,...



Also, most likely, all your fields need to be written with a lower case initial
letter,

   Order  ( $discount : discount > 10, $items : items)



-W



On
Tue, Feb 23, 2010 at 1:11 PM, dhari <[hidden email]>
wrote:



In this scenario I do have typical Order and Items data structure. I want to

implement various business rules where I want to check both Order attributes

and Item attributes together.



Order [ Date, Discount, Amount, Customer, Type, Items]

Item [ Quantity, Rate, ExpiresDate, Grade ]



I am trying to implements following rules but all gives me syntax error. I

wondering if someone can help me in.





rule one

   when

       Order  ( $discount : Discount, $items : Items)

       Item ($discount > 10 && Grade > 3)
from $items

   then

       System.err.print(Discount is not allowed with items
having grade 3 or

higher)

end



rule two

   when

       Order  ( $discount : Discount, $items : Items)

       Item ($discount  > 20 || Quantity < 5 )
from $items

   then

       //do some thinge

end

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