How to modify expression rule without break compatibility

Amir Hanif

Certified Lead Developer

over 7 years ago

I have an expression rule formatList that takes 1 parameter formatList(markets). Now I want to modify this rule by adding one more parameter param2 { formatList(markets,param2) }. This expression rule is being used in a process model. If I add new parameter in this rule it will cause exception (formatList has 2 parameters, but instead passed 1 parameters) in inflight process model ( process already started and not completed). Is there any way to avoid this exception? do I have to create new expression rule instead of modify existing one?

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0 TJ
A Score Level 2
over 7 years ago

This type of scenarios can be prevented using label value pair while calling the expression rules.
For e.g. rule!rule_name(param1Label:param1Value, p2Label:p2Value)
This way, when you add another parameter to your expression, it take null value by default and the 'incorrect number of param' exception gets handled.
Ofcourse- you need to handle null pointer exception in rule definition..
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0 TJ
A Score Level 2
over 7 years ago

This type of scenarios can be prevented using label value pair while calling the expression rules.
For e.g. rule!rule_name(param1Label:param1Value, p2Label:p2Value)
This way, when you add another parameter to your expression, it take null value by default and the 'incorrect number of param' exception gets handled.
Ofcourse- you need to handle null pointer exception in rule definition..
Cancel
Vote Up 0 Vote Down

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Verify Answer

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