Fix #297 duplicate after_all_transitions after reload

lib/aasm/state_machine.rb

@@ -44,7 +44,7 @@ module AASM
     def add_global_callbacks(name, *callbacks, &block)
       @global_callbacks[name] ||= []
       callbacks.each do |callback|
-        @global_callbacks[name] << callback
+        @global_callbacks[name] << callback unless @global_callbacks[name].include? callback
       end
       @global_callbacks[name] << block if block
     end

spec/unit/callbacks_spec.rb

@@ -94,6 +94,39 @@ describe 'callbacks for the new DSL' do
     callback.close!
   end
 
+
+  it "works fine after reload" do
+    show_debug_log = false
+
+    callback = Callbacks::Basic.new(:log => show_debug_log)
+    callback.aasm.current_state
+
+    # reload the class
+    Callbacks.send(:remove_const, :Basic)
+    load 'models/callbacks/basic.rb'
+
+    unless show_debug_log
+      expect(callback).to receive(:before_event).once.ordered
+      expect(callback).to receive(:event_guard).once.ordered.and_return(true)
+      expect(callback).to receive(:transition_guard).once.ordered.and_return(true)
+      expect(callback).to receive(:before_exit_open).once.ordered                   # these should be before the state changes
+      expect(callback).to receive(:exit_open).once.ordered
+      # expect(callback).to receive(:event_guard).once.ordered.and_return(true)
+      # expect(callback).to receive(:transition_guard).once.ordered.and_return(true)
+      expect(callback).to receive(:after_all_transitions).once.ordered
+      expect(callback).to receive(:after_transition).once.ordered
+      expect(callback).to receive(:before_enter_closed).once.ordered
+      expect(callback).to receive(:enter_closed).once.ordered
+      expect(callback).to receive(:aasm_write_state).once.ordered.and_return(true)  # this is when the state changes
+      expect(callback).to receive(:after_exit_open).once.ordered                    # these should be after the state changes
+      expect(callback).to receive(:after_enter_closed).once.ordered
+      expect(callback).to receive(:after_event).once.ordered
+    end
+
+    # puts "------- close!"
+    callback.close!
+  end
+
   it "does not run any state callback if the event guard fails" do
     callback = Callbacks::Basic.new(:log => false)
     callback.aasm.current_state