[RFC] Call model's validate_fsm_state_change via Form.is_valid #74
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This allows for validation on the model level for a transition that is
about to happen (via
form.is_valid
).Raising ValidationError via
validate_fsm_state_change
allows forDjango handling it properly, instead for when the ValidationError would
be raised from the transition function itself.
Ref: django/django#9113
Ref: viewflow/django-fsm#120