Passing dynamical no of parameters to a rule

RE: Passing dynamical no of parameters to a rule

Mike Schmitt — Fri, 09 Feb 2024 16:42:15 GMT

Cool, thanks for confirming 🙂

RE: Passing dynamical no of parameters to a rule

jagjots3791 — Fri, 09 Feb 2024 16:39:26 GMT

Thank you. Thats what I wanted to know.

RE: Passing dynamical no of parameters to a rule

Mike Schmitt — Fri, 09 Feb 2024 16:27:05 GMT

No, that is not possible. The best thing you can do (and honestly, I've found it to be sufficient in nearly 100% of my use cases over the past 11+ years) is to call all parameters and conditionally pass values to them.

RE: Passing dynamical no of parameters to a rule

jagjots3791 — Fri, 09 Feb 2024 16:23:40 GMT

Yeah, I want to pass parameters like below in the rule thats not hardcoded and it should give what I written in expression original question. I guess its not possible.

a!localVariables(
  local!para: {"para1", "para2"},
  local!val: {"val1", "val2"},
  rule!JS_abcRule(
    local!para[1]: local!val[1],
    local!para[2]: local!val[2]
  )
)

RE: Passing dynamical no of parameters to a rule

Mike Schmitt — Fri, 09 Feb 2024 15:54:14 GMT

When you call a rule with Keyword Syntax (like you've done in your example), all parameters are optional as long as you've set up the rule to handle nulls. From the calling rule or interface, you can invoke any subset (between 1 and all) of the parameters (it can't be zero unless the rule has none), and each one you utilize can conditionally be passed a value or not, depending on the logic you prefer.

There's not really any additional way to "dynamically pass parameters", if i'm even reading your question right, because in any one invocation of the rule, any parameters you pass in must be hardcoded into the rule call (but this is where you can fall back on conditionally passing in a value for individual items if you wish).

RE: Passing dynamical no of parameters to a rule

Stefan Helzle — Fri, 09 Feb 2024 15:37:12 GMT

Did you consider to use a list or a map?

What are you aiming for? Appian is not Java, trying add more levels of abstraction gets you quickly into unsafe waters.

RE: Passing dynamical no of parameters to a rule

Konduru Chaitanya — Fri, 09 Feb 2024 15:36:53 GMT

Hello jagjots3791

Not sure uf i completely understand your question. But from what I understand, you want to use a set of values even if the user/process doesn’t provide values to them.

you can have the values set in locals and use default value function.

If your question is about query filter or rule parameters you can handle it with the apply when or simple if logics.