aasm column :state do

  state :unkown, initial: true
  state :matched

  event :match do
    transitions from: :unknown, to: matched, after: :matched_event
  end

  def matched_event
    puts aasm.current_event  # yields nil if triggered with aasm.fire!(:match)
  end

end

aasm.match!                # => Correct, aasm.current_event yields 'match!'
aasm.fire!(:match)         # => Incorrect, aasm.current_event yields nil

def update
  ...
  if model.respond_to?("may_#{params[:event]}?') && model.send("may_#{params[:event]}?")
    model.send("#{params[:event]}!")
  end
  ...
end