l2nguyen / action-on-form-init

action-on-form-init

This is a simple bot in Rasa 3.x that provides a workaround for running actions on form initialisation because form validation is now only run after the form is active. See this issue for more details.

This is inspired by this solution here and Rasa's financial demo.

The workaround is acheived by:

1. Add a slot form_initialized with a custom type mapping as the first required slot for every form that needs initialization logic.

2. Add a custom slot extraction method for form_initialized. This will run on every user turn. It will set the slot to False unless the slot is both currently set (it's set by the form below) and the form is still active. This takes care of resetting the slot once a form is closed.

3. Create a form validation base class that runs extra logic when form_initialized is False, and includes a validation method for form_initialized that just sets the slot to True. The validation method will only run after the form was initialized.

4. Subclass the custom form validation action for any forms requiring initialization logic.