Pass eventData to condition

[aurelien78]

Hi,

First, thanks a lot for your work. My request : would it be possible to pass eventData to condition also ?

Thanks a lot.

[aleneum]

The documentation states:

If you set send_event=True at Machine initialization, all arguments to the triggers will be wrapped in an EventData instance and passed on to every callback.

Since conditions are also callbacks, you get event data just like in other callbacks like before etc.

from transitions import Machine, EventData

class Model:

    def has_element(self, event_data: EventData) -> bool:
        return "element" in event_data.kwargs

model = Model()
machine = Machine(model, states=["A", "B"], initial="A", send_event=True,
                  transitions=[dict(trigger="go", source="A", dest="B", conditions="has_element")])

assert model.is_A()
assert not model.go()
assert model.is_A()
assert model.go(element=1)
assert model.is_B()

I will close this issue since it seems to be a question about how to use transitions since the feature you request is already implemented. Feel free to comment anyway. I will open the issue again if necessary.

[aurelien78]

Thanks a lot. For information, I had a problem using event as parameters since I left @property declaration : @property def condition(self, event) -> bool: return True Doesn't work

Removing @property and then ok !