Hi All,
I am getting expression error when trying to pass the below rule in the input a user input task. I am passing the correct PV value in every step of my flow. Please suggest if there is anything wrong in this rule. Thanks in advance.
Expression error: An error occurred while evaluating expression: =rule!REGAL_cdt_getDocumentsFromFolder(pv!caseDocFolder) (Expression evaluation error in rule 'REGAL_cdt_getdocumentsfromfolder' at function 'getdocumentinternalidsfromfolder' [line 2]: Null Arguments are Invalid) (Data Inputs)
REGAL_cdt_getdocumentsfromfolder Rule Code:
load( local!documentsFromFolder: getdocumentinternalidsfromfolder( ri!folder, false() ), a!forEach( items: local!documentsFromFolder, expression: cast( 'type!{urn:com:appian:types}REGAL_documents'(), { documentId: tointeger( fv!item ), documentName: document( tointeger( fv!item ), "name" ), createdBy: document( fv!item, "lastUserToModify" ), createDateTime: document( fv!item, "dateCreated" ) } ) ))
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I didn't look at all your code, but in addition to confirming that your ri of folders is not empty/null, did you also confirm that each folder has at least one document? If a folder can be empty, you need to account for that. Just a quick thing to add and check to see if it gets you unblocked.
The rule you have listed is fine. From the error, the problem is that 'ri!folder' is null when this SAIL gets evaluated. When testing this rule in an expression rule, make sure the rule input for folder is not null. It's also helpful to have null checking to catch these errors such as:
local!documentsFromFolder: if( isnull(ri!folder), {}, getdocumentinternalidsfromfolder( ri!folder, false )
It may help to look at process monitoring as well to see if the pv for folder has a value.