i need help to understand something with saving an item in variable which use CDT ,
i create a variable with a CDT ( type document that i defined ) and i created a list which bring me some data , which is also use CDT
now i create a for each because i want to to save data each time with the function save!() , but after that i click on test rule it doesnt show nothing everythin is null .
what am i doing wrong ??? if i using a rule input i have the same issue ...
what is the way to get the data in another variable .
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this is what i have before the Save
you don't use a!save in an expression rule. That is part or the saveInto parameter of a SAIL Interface Functions. try to use a!update() for expression rules instead.docs.appian.com/.../fnc_array_a_update.html
besides that, i am not absolutely sure of your target here?
thank you i i will read that
Appian is using a functional language. Variables are immutable in expressions. In interfaces a variable can only be modified on user interaction.
It takes a while to get used to this.
The basic principle is, that if you do not like a value, wrap it into another function or expression.
I agree with the earlier commentors - what is your input state, and what is your desired output?
Expression rules are powerful but you have to think of them as a transformation from input X to output Y. That can be simple (think of the rule "upper()", if input is "a", then output will be "A"), or more complicated (a query, where your input is perhaps a few different filters, and the output is an array of data from the DB which matches those filters).
In your screenshot I can neither tell what your input will be in a real world use case (a single instance of "document"?), nor what your desired output will be. Knowing these is pretty much a requirement before even starting on creating a workable expression rule.
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