DialogFlow CX inline system functions not working in text fulfillment

Question

I would like to generate dynamic text without the need to create webhooks whenever possible. I understand that the only way to create dynamic text is by either creating different routes depending on parameters or by using inline system functions like $sys.func.ADD(1, 2) within text fulfillments.

But inline system functions like $sys.func.ADD(1, 2) do not work for me if used in text fulfillments. System functions just don't get executed for me. I.e. instead of uttering "3" my bot just utters "$sys.func.ADD(1, 2)" as a result of a test fulfillemnt. What am I doing wrong here? Does anybody have an example for using inline system functions in text fulfillment?

Thanks!

Answer 1

To resolve this issue, you need to check the result of system functions in order to identify the error that occurred.

For the system function $sys.func.ADD, when using it as a text response in your fulfillment, you need to convert it to type STRING to be embedded in text since the output of this system function returns a type DOUBLE.

You can convert the output of the $sys.func.ADD function to STRING by creating a nested function in your text response and utilizing the $sys.func.TO_TEXT which converts a value of other types to string.

Here’s an example for reference: