Statemachines point to newest instance for their state variables

[KellyP5]

I am not sure this was solved, if I create multiple instances of a state machine -- the newest statemachines class variables will serve as the single point of truth for all state machines.

from statemachine import State
from statemachine import StateMachine
class TestStateMachine(StateMachine):
    # States
    st_1 = State("One", initial=True)
    st_2 = State("Two")
    st_3 = State("Three")
    # Transitions
    tr_change = (
        st_1.to(st_2, cond="two")
        | st_2.to(st_3, cond="three") 
        | st_3.to(st_1, cond="one")
    )
    def __init__(self, name="unnamed"):
        # variables
        self.sm_name = name
        self.one = False
        self.two = True
        self.three = False
        super().__init__()
        
s1 = TestStateMachine()
s2 = TestStateMachine()
s1.current_state
State('One', id='st_1', value='st_1', initial=True, final=False)
s2.current_state
State('One', id='st_1', value='st_1', initial=True, final=False)
s1.tr_change()
s1.current_state
State('Two', id='st_2', value='st_2', initial=False, final=False)
s2.current_state
State('One', id='st_1', value='st_1', initial=True, final=False)
s2.two = False
s2
TestStateMachine(model=Model(state=st_1), state_field='state', current_state='st_1')
s2.tr_change()

statemachine.exceptions.TransitionNotAllowed: Can't tr_change when in One.

s1.three = True
s1.three
True
s2.three
False
s1.tr_change() # this shouldn't throw an error because s1.three is now true

statemachine.exceptions.TransitionNotAllowed: Can't tr_change when in Two.

s2.three = True # When I change the variable on s2, it then allows me to transition the state of s1
s1.tr_change()
s1.current_state 
State('Two', id='st_2', value='st_2', initial=False, final=False)

Originally posted by @KellyP5 in #330 (comment)

[KellyP5]

Simpler and more straightforward version

s1 = TestStateMachine("s1")
s2 = TestStateMachine("s2")
s1.current_state
State('One', id='st_1', value='st_1', initial=True, final=False)
s2.current_state
State('One', id='st_1', value='st_1', initial=True, final=False)
s1.one
False
s1.two
True
s1.three
False
s2.one
False
s2.two
True
s2.three
False
s2.two = False
s1.tr_change()

Traceback (most recent call last):
statemachine.exceptions.TransitionNotAllowed: Can't tr_change when in One.

s2.two = True
s1.tr_change() # No error

[fgmacedo]

Hi @KellyP5 , thanks for reporting this. I was now able to reproduce the issue. I'll try to find where the bug is and release a bug fix.

[fgmacedo]

I've released a 1.0.3 version today with this bugfix.