Merge pull request #177 from jdguzman/jd/fix/remove-activerecord-depe…

…ndency

Remove explicit ActiveRecord dependency

.todo.reek

@@ -50,6 +50,7 @@ InstanceVariableAssumption:
 ManualDispatch:
   exclude:
   - Transitions::Event#default_timestamp_name
+  - Transitions::Event#error_message_for_invalid_transitions
   - Transitions::Machine#fire_event
   - Transitions::Machine#handle_event_failed_callback
   - Transitions::Machine#handle_event_fired_callback

lib/transitions/event.rb

@@ -143,7 +143,7 @@ def build_success_callback(callback_names)
 
     def error_message_for_invalid_transitions(obj)
       "Can't fire event `#{name}` in current state `#{obj.current_state}` for `#{obj.class.name}`"\
-      " #{obj.class < ActiveRecord::Base && obj.persisted? ? "with ID #{obj.id} " : nil}"
+      " #{obj.respond_to?(:id) ? "with ID #{obj.id} " : nil}"
     end
   end
 end