What does slot_was_set: a_slot: null mean?

Rasa Open Source
1

In stories or rules, when you do:

- action: some_action
- slot_was_set:
   - whatever_slot: null

Does that mean?

  • the action changed the slot value to null
  • the action did not change the slot value
  • the current state of the slot is null, regardless of what happened with action

Or some combination of these? This is really vague for me, and I couldn’t find an explanation in the documentation.

2

After an action, it means the slot was probably set to null (or None in a Custom Action) - your first point.

Before an action, it means the value of that slow is null - your third point.

Generally, it means the value is null at that point.

3

Thanks for the answer!

What do you mean by “probably”? Even if the action doesn’t actively set it as null, can I use it as a condition to be satisfied before going to the next step? Or for this rule to be activated, the said action should have set the value as null?

4

@doguaraci if the slot_was_set has some value then it will process that slot value for your custom action which you have defined and use in in the next action if you are using.

5

I mean that as humans, when we see that, we should deduce that it was probably the case.

Yes