Help with calling API with parameter and setting slot value

Rasa Open Source
1

I have a requirement to send a parameter with the call to Rasa endpoint API - http://localhost:5005/webhooks/rest/webhook. I need to set a slot value so I can retrieve it using custom actions. I am unable to set slot value (using button with payload).

domain.yml

version: "3.1"
forms:
  td_form:
    required_slots:
    - td_path

  slots:
    td_path:
      type: text
      influence_conversation: true
      mappings:
      - type: custom
        action: action_call_api  
        conditions:
        - active_loop: td_form
          requested_slot: td_path

actions:
  - action_call_api

entities:
- td_path

intents:
  - greet
  - select_path
  - inform_path
  - find_destination
  - destinationA
  - destinationB

responses:
  utter_greet:
  - text: "Hello User"

utter_select_path:
  - text: "Select your choice"
    buttons:
    - title: "Find destination A"
      payload:  /inform_path{{"td_path":"destinationA"}}
    - title: "Find destination B"
      payload:  /inform_path{{"td_path":"destinationB"}}

session_config:
  session_expiration_time: 60
  carry_over_slots_to_new_session: true

stories.yml

version: "3.1"
stories:
- story: create test data
  steps:
  - intent: greet
  - action: utter_greet
  - action: utter_select_path

actions.py

class ActionSetDestinationPath(Action):
    
    def name(self) -> Text:
        return "action_call_api"

    def run(
            self, dispatcher: CollectingDispatcher, tracker: Tracker, domain: Dict[Text, Any]
        ) -> List[Dict[Text, Any]]: 

        selected_path = tracker.get_slot('td_path')
        dispatcher.utter_message("Selected path is... {selected_path}")
        return []

Thanks in advance for all the help.

2

Did you mean to use an f-string here, like f"Selected path is ... {selected_path}" ?

3

No, I wanted to set the slot value from an API call. I fixed the issue: I had to create a rule for setting the slot value. Refer this post - How to set slots in the initial request - #4 by ILG2021
Thanks @jtrasa