[rules-users] Using ForEach variables in split constraints

[sam.squire at paretopartners.com]

Hello there,

I wanted to refer to a variable in a split constraint in a ForEach node. 
What is the correct way to nest a split node in a ForEach node and refer 
to the variable of the collection?

I have tried the following:

a)  Start process and insert process into session, providing the map 
containing the collectionExpression. Using:

<import name="org.drools.runtime.process.WorkflowProcessInstance"/> 

processIntance: WorkflowProcessInstance()
$item: MyObject: (this == (processInstance.getVariable("item")))

this doesn't seem to grab the variable like I expected it to.

How can I assign processInstance.getVariable("item") itself to a variable? 
(I imagine this would work if this did)


b) Set the variable on the global process from the current context

kcontext.getProcessInstance().setVariable("item", 
kcontext.getVariable("item")


I know this is not the right answer.

c) Insert the item in an action at the beginning of the loop. Retract it 
at the end. I then match against the item of type MyObject at the 
beginning.

// in action:
insert(item)
// in constraint
$item: MyObject()
// after action
retract(item)

This requires looping in Java to start the processes individually and 
setting the variable explicitly each time.

This seems a bit of a roundabout way of doing it, what is *the* correct 
method?

Thanks,

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