Validate () of FormField

[piyushporwal6795]

Rasa Core version: 0.9.3

Python version: 3.5

Operating system: Windows 10

Issue: How to use validate() of FormField ?

[tannn]

There is information for validation in the documentation.

[piyushporwal6795]

I am ain't getting it exactly. How we will use?

[tannn]

Below is an example implementation if you would like to validate that the user is entering a valid color. Any entry that doesn't match in the if statement would return None.

from rasa_core.actions.forms import FormAction 

class CustomFormActionColorValidation(FormAction):
    def validate(self, value):
        if value is not None:
            if value == "red":
                return value
            elif value == "blue":
                return value
            elif value == "green":
                return value
            elif value == "yellow":
                return value
            elif value == "purple":
                return value
            elif value == "black":
                return value
            elif value == "white":
                return value
            elif value == "magenta":
               return value
        return None

[piyushporwal6795]

Okay thanks, will try and get back to you if I face any issues further

[Egalite123]

Pardon for duplicating the same question. I think, this is a better place.
Will it be possible to keep the validate function outside the core unit (within forms.py) and make it part of custom code?
Though this is working, it could lead to a mess. Imagine I am developing multiple bots and have to write all validations in a single unit. Possibly, some unnecessary code could creep into the master!
Thanks for considering.

[tannn]

@Egalite123 Yes, in that case you can create the class in the directory you would like to use it, and import it when necessary. There is no requirement for adding files to the core code.

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[stale]

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