Rule Event - Not working as expected

Can you add:

• the code for the rule you're calling from the Rule Event
• how you've configured your Rule Event

then we have a better chance of diagnosing what's happening.

Please use the "</>Insert Code" option when posting code

thanks

Rule event is configured on the Process model next to Synchronous sub-process

Rule Event -> New Expression

rule!expressionrulename(pv!parameter)

expressionrulename is an query entity as below

1 input parameter - datatype Integer

code

if(

a!queryEntity(....).totalCount = 0,

true,

false

)

Several things to observe/consider here:

• What do you expect to happen if the expression returns false? There isn't anything that is going to cause the rule to be re-evaluated so your process is going to be suspended indefinitely (well, until Appian decides that it's been waiting too long for its own good!)
• suspending a synchronous process whilst you're waiting for something that may not happen isn't a great user experience. You probably need to re-think your design
• your code can be made simpler - a!queryEntity(....).totalCount = 0 is either true or false, you do not need to wrap it with an if() statement

I would take a step back and try and articulate what you're trying to achieve with this pattern and see if there are other ways it can be achieved.

Also... how will a!queryentity() even behave if called in the expression for a rule?  I don't assume it will constantly re-execute.  Will it re-execute any time the RI's value is changed, even?  I'd have to try this myself before being able to confidently recommend anything either way.

+1 on understanding the use case more. In general most appian developers don't use rule events on process models very often because there's often a better way to achieve the same solution.

+1 on understanding the use case more. In general most appian developers don't use rule events on process models very often because there's often a better way to achieve the same solution.