Get Expression rule by name

Question

Hi there, 
 
 does anybody know whether it possible to get an expression rule by its name? 
 Problem context: In my application (software request), I want to maintain software. Some software needs to be approved before installation. I am thinking about designing the (sometimes complex) rules for identifying the approval user groups in terms of expression rules. (Doing this with decision tables is not possible since I need a CDT as rule input) These rules would then be referenced by name as an attribute of the software CDT. Within the software request process, I then want to get the referenced expression rule and execute it to get the approval group to forward the approval task to.

bradc0001 · Accepted Answer

I have accomplished something similar to this in the past by utilizing Appian's externalize() and internalize() functions. 
 Steps: 
 
 Use externalize(rule!someExpression)
 
 Do not put the parenthesis for your expression in this function

Store this string in your CDT to reference later. For this example, I would store it in ri!softwareCDT.externalizedString 
 To call this expression: internalize(ri!softwareCDT.externalizedString)(input1: "ABC", input2: "XYZ") 
 
 This should execute the rule reference you have stored as a string in your CDT. 
 There may be some extra challenges you face, but this is the basic concept.

Get Expression rule by name

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