How to use Nested flows

[jyotipmahes]

Hi, I am looking for use cases where one flow can call another flow. How can we do that? Will it be supported in the future?

[drazvan]

Hi @jyotipmahes!

The documentation provides a simple example: https://github.com/NVIDIA/NeMo-Guardrails/blob/main/docs/user_guide/colang-language-syntax-guide.md#subflows. You can encapsulate a user authentication logic for example in a flow that gets called from another one. There are a few more examples in the tests section (https://github.com/NVIDIA/NeMo-Guardrails/blob/main/tests/test_subflows.py). We'll be adding more examples soon. Is there any specific use case you have in mind for using nested flows?

[jyotipmahes]

@drazvan Thanks for sharing this. I will try to use the above to see if this meets the need. I am just prototyping as of now so no specific use case

[lawya-cm]

Is it possible to route to different subflows conditionally within a single flow

e.g

define flow emergency
    execute log_emergency(prompt=$last_user_message)
    when user fire
        do emergency fire
    when flood
        do emergency flood
    
    bot get location

define bot fire response
    "If there is a fire call 911 immediately"

define bot get location
    "What is the location of the emergency?"

define bot fire extinguish
    "You should have a fire extinguisher under the kitchen sink"

define subflow emergency fire
    bot fire response
    bot fire extinguish

etc.

btw. the above does not work