return[SlotSet()] doesn't set slot when value is a variable

Rasa Open Source
1

Hello everyone,

I’m having a little bit of trouble with the SlotSet()-function.

First of all: the slot in the domain looks like this:

  language:
    type: any
    auto_fill: false

(I broke it down to the bare minimum, it used to be a categorical slot)



So my project has a action_welcome and it first checks which language to use:

language = self.select_language(tracker, texts, tracker.latest_message["text"])

the select_language function returns the predefinded default-language-code “DE” , if the slot has not been set before (aka when the bot is started for the first time) or a new language-code according to the latest message the user sent (i.e. latest user message is “english” → select_language returns “EN” or else it simply returns the language the tracker has currently stored


At the end of my custom action I want to set the language slot, by doing:

return [SlotSet("language", language)]

if the slot value was none before (on start-up) this works just fine, but when I want to change between languages it doesn’t store the new language code, even though the language variable is correct.


It may be important to mention, that action_welcome often is a FollowupAction to another action called action_out_of_scope. action_out_of_scope handles almost every user input, it also initially checks, if the user wants to change the language and if so it returns [FollowupAction(“action_welcome”)].


So here is little example run down (without the bots answers, italic text are the print statements from the action sever):

user: hallo
tracker language at beginning of action welcome: none
language variable shortly before it schould be set: DE

user: wie war dein Tag
tracker language in out of scope: DE (so it was set correctly, when it was none before)

user: english
tracker language at beginning of action welcome: DE
language variable shortly before it schould be set: EN

user: how was your day
tracker language in out of scope: DE (didn’t change to EN)


I honestly do not know, where I am doing something wrong, any help on this would be highly appreciated.