[rules-users] Collect just first instance using the FROM CE

[Mohod, Akash]

Hi,

I am using Drools version 5.0 . I am facing an issue in my LHS that I haven't been able to figure out how to resolve :-

The rule looks like this :-

when
    $customerCart : CustomerGrid($c_holdings : cartHoldings, $c_productTypes: productTypes, $c_details : customerDetails)
    $productType : java.lang.String() from $c_productTypes
    $productType_total : Double()
                        from accumulate (
                            CustomerHolding(productType == $productType, $value : percent) from $c_holdings,
                            sum ($value)
                        )
    $ch : CustomerHolding (productType == $productType, $group : productGroup) from $c_holdings
    $productType_reference : CustomerDetail(identifier (== $productType || == $group) , $productType_limit : purchaseLimit)
                                                                            from $c_details
    eval ($productType_limit < Math.abs($productType_total.doubleValue()))
then
                System.out.println("XYZ");
End


The issue is with this line of code
    $ch : CustomerHolding (productType == $productType, $group : productGroup) from $c_holdings

This will get executed as many times as there are number of  CustomerHolding objects for the given  $productType in the $c_holdings collection.
All I need to do is simply get the Associated $group with the $productType and thus should only get executed once.
Any idea how to go about writing this rule ?

Also is there a better way to write this rule ?

Regards,
Akash


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