Elsa.WriteLine expression and memory reference

^{Originally posted by **mremadevi** April 29, 2024}
This is in reference to discussion #5300

Understand that memory reference is an internal mechanism used Elsa to track activity inputs and outputs and defining workflow through designer handles the reference internally .

If the workflow is defined thorough visual designer and saved as JSON file . Application loads the JSON file and executes the workflow through code , how is references handled ? In example below WriteLine uses output of previous activity set in variable as input
using expressions . When JSON is exported , there is no memory reference for input 'text'. It only has expression. This will fail when JSON workflow file is loaded and executed from code with memory reference doesn`t exist error. Manually setting a unique memory reference id is also not working .

What is the right way to use previous activity output when loading workflows from JSON file and running workflow from code.

{
"text": {
"typeName": "String",
"expression": {
"type": "JavaScript",
"value": "Nice to meet you, ${getName()}!"
}
},
"id": "WriteLine2",
"type": "Elsa.WriteLine"
}