allow retrieving the current event (see #159 and #168)

CHANGELOG.md

@@ -4,6 +4,10 @@
 
  * deprecated old aasm_* class methods (old-style DSL), in preparation for AASM v4.0.0
 
+## 3.4.0
+
+ * allow retrieving the current event (`aasm.current_event`) (see [issue #159](https://github.com/aasm/aasm/issues/159) and [issue #168](https://github.com/aasm/aasm/issues/168))
+
 ## 3.3.3
 
  * bugfix: support reloading development environment in Rails (see [issue #148](https://github.com/aasm/aasm/issues/148))

README.md

@@ -163,6 +163,31 @@ originating state (the from-state) and the target state (the to state), like thi
   end
 ```
 
+#### The current event triggered
+
+While running the callbacks you can easily retrieve the name of the event triggered
+by using `aasm.current_event`:
+
+```ruby
+  # taken the example callback from above
+  def do_something
+    puts "triggered #{aasm.current_event}"
+  end
+```
+
+and then
+
+```ruby
+  job = Job.new
+
+  # without bang
+  job.sleep # => triggered :sleep
+
+  # with bang
+  job.sleep! # => triggered :sleep!
+```
+
+
 ### Guards
 
 Let's assume you want to allow particular transitions only if a defined condition is

lib/aasm/base.rb

@@ -55,10 +55,12 @@ def event(name, options={}, &block)
       end
 
       @klass.send(:define_method, "#{name.to_s}!") do |*args, &block|
+        aasm.current_event = "#{name.to_s}!".to_sym
         aasm_fire_event(name, {:persist => true}, *args, &block)
       end
 
       @klass.send(:define_method, "#{name.to_s}") do |*args, &block|
+        aasm.current_event = name.to_sym
         aasm_fire_event(name, {:persist => false}, *args, &block)
       end
     end

lib/aasm/instance_base.rb

@@ -1,7 +1,7 @@
 module AASM
   class InstanceBase
 
-    attr_accessor :from_state, :to_state
+    attr_accessor :from_state, :to_state, :current_event
 
     def initialize(instance)
       @instance = instance

spec/unit/event_spec.rb

@@ -244,6 +244,24 @@
   end
 end
 
+describe 'current event' do
+  let(:pe) {ParametrisedEvent.new}
+
+  it 'if no event has been triggered' do
+    expect(pe.aasm.current_event).to be_nil
+  end
+
+  it 'if a event has been triggered' do
+    pe.wakeup
+    expect(pe.aasm.current_event).to eql :wakeup
+  end
+
+  it 'if no event has been triggered' do
+    pe.wakeup!
+    expect(pe.aasm.current_event).to eql :wakeup!
+  end
+end
+
 describe 'parametrised events' do
   let(:pe) {ParametrisedEvent.new}