Support passing event name as context to save upon firing of an event

[alecvn]

In order to run validations specific to certain events I've been using the following pattern:

aasm :state do
  state :state1
  state :state2
  state :state3
  
  event :myevent1 do
    before do
      class_eval do
        validate :some_custom_validation
      end
    end
    transitions from: :state1, to: :state2
  end
    
  event :myevent2 do
    before do
      class_eval do
        validate :some_custom_validation
      end
    end
    transitions from: :state2, to: :state3
  end
  
end

This works just fine but it has always felt a little clunky.

I've recently come across a blog post discussing validation contexts and it immediately made me think of aasm.

It would be really nice if one could configure your events to fire with a context equal to the event name - and/or to override the context passed to save.

This will allow one to end up with something like:

validate :some_custom_validation, on: [ :myevent1, :myevent2 ]

aasm :state, event_as_context: true do
  state :state1
  state :state2
  state :state3
  
  event :myevent1 do
    transitions from: :state1, to: :state2
  end
    
  event :myevent2 do
    transitions from: :state2, to: :state3
  end
  
end

Is this something that would be a useful contribution or am I barking up the wrong tree and should be handling things differently?