Slot validation for multiple slots

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I am trying to find out how to work with ValidationAction. It works fine when I only want to validate one slot buf if I want to validate more than one it crashes. I have a slot “checkin_date_dummy” that I use to extract information from Duckling. If Duckling returns a date range, then I want to fill the “checkin_date” and “checkout_date”, otherwise just the “checkin_date” slot.

I am also trying to figure out how to set slot values in custom actions, because this way I could simply update the slot values and would only return a single slot in the return statement.

class ValidatePredefinedSlots(ValidationAction):

    def validate_checkin_date_dummy(

        self,

        slot_value: Any,

        dispatcher: CollectingDispatcher,

        tracker: Tracker,

        domain: DomainDict,

    ) -> Dict[Text, Any]:

        """Validate checkin_date_dummy."""

        # DucklingEntityExtractor returns a dict when it extracts a date range

        if isinstance(slot_value, dict):

            print("Is dict:")

            #tracker.set_slot("checkout_date", get_date(slot_value.get("to")))  ### FIX: 'Tracker' object has no attribute 'set_slot'

            #SlotSet("checkout_date", get_date(slot_value.get("to")))  ### FIX: This crashes

           

            return {"checkin_date": get_date(slot_value.get("from"))}

            #return {"checkout_date": get_date(slot_value.get("to"))}

            #return {"checkin_date": get_date(slot_value.get("from")),

            #       "checkout_date": get_date(slot_value.get("to"))}

            #return [SlotSet("checkin_date", get_date(slot_value.get("from"))),

            #        SlotSet("checkout_date", get_date(slot_value.get("to")))]

        else:

            # DucklingEntityExtractor returns a string for a single date/time

            print("is no dict")

            return {"checkin_date": get_date(slot_value)}

            #return SlotSet("checkin_date", get_date(slot_value))```