Issues with Dynamic behaviour of form

Rasa Open Source
1

I need a detailed example of how dynamic behviour of form is implemented This is something I am refering to in rasa docs

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below is my use case:-

there would be a form where user would provide a counterparty name to get trade data. Then user would be asked to provide whether he needs “All data” or “within a date range”. If he chooses date range then two additional slots would be added to required slots ie. start_date and end_date to be filled by form. please refer below snapshot for the workflow

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Is there any way to define slot mappings to these additional slot so that dates are extracted automatically from regex or duckling service.

I could’nt find a way of doing this, so implemented a extract_start_date and extract_end_date method to extract dates using regex. But, even in this case when bot asks for utter_ask_start_date and user provides a date, same date is getting extracted withing extract_end_date as well (though this slot wasn’t asked yet). And, as both slots are form gets deactiavated and goes to next action for submit with incorrect details.

BOTH extract_start_date and extract_end_date are getting invoked when user gives only start_date. below is the code snippet for Formvalidation.

class ValidateCounterpartyListForm(FormValidationAction):

def name(self) -> Text:
    return "validate_counterparty_name_list_form"


async def required_slots(
    self,
    slots_mapped_in_domain: List[Text],
    dispatcher: "CollectingDispatcher",
    tracker: "Tracker",
    domain: "DomainDict",
) -> Optional[List[Text]]:
    additional_slots = []
    print("timneline==",tracker.get_slot('trade_timeline'))
    if tracker.get_slot('trade_timeline') == "date_range":
        additional_slots.append("start_date")
        additional_slots.append("end_date")

    return additional_slots + slots_mapped_in_domain

async def extract_start_date(
    self, dispatcher: CollectingDispatcher, tracker: Tracker, domain: Dict
) -> Dict[Text, Any]:
    text_of_last_user_message = tracker.latest_message.get("text")
    date_regex="^(0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](19|20)\d\d$"

    date_search = re.search(date_regex, text_of_last_user_message, re.IGNORECASE)
    if date_search:
        start_date = date_search.group(1)+date_search.group(2)+date_search.group(3)
        print("setting start date to ", start_date)
        return {"start_date": start_date}

    return {"start_date": None}

async def extract_end_date(
    self, dispatcher: CollectingDispatcher, tracker: Tracker, domain: Dict
) -> Dict[Text, Any]:
    text_of_last_user_message = tracker.latest_message.get("text")
    date_regex="^(0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](19|20)\d\d$"

    date_search = re.search(date_regex, text_of_last_user_message, re.IGNORECASE)
    if date_search:
        end_date = date_search.group(1)+date_search.group(2)+date_search.group(3)
        print("setting end date to ", end_date)
        return {"end_date": end_date}

    return {"end_date": None}