added support for from state retrieval (for any given state)

CHANGELOG.md

@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## 3.0.11
+
+ * added class method aasm_from_states_for_state to retrieve all from states (regarding transitions) for a given state
+
 ## 3.0.10
 
  * added support for transitions from all other states (thanks to Stefan 'swrobel' Wrobel)

lib/aasm/aasm.rb

@@ -31,6 +31,10 @@ module AASM
       end
     end
 
+    def aasm_from_states_for_state(state)
+      aasm.events.map {|k,v| v.transitions_to_state(:active)}.flatten.map(&:from).flatten
+    end
+
     # deprecated
     def aasm_initial_state=(state)
       AASM::StateMachine[self].initial_state = state

lib/aasm/supporting_classes/event.rb

@@ -28,6 +28,10 @@ module AASM
         @transitions.select { |t| t.from == state }
       end
 
+      def transitions_to_state(state)
+        @transitions.select { |t| t.to == state }
+      end
+
       def all_transitions
         @transitions
       end

spec/unit/aasm_spec.rb

@@ -1,30 +1,15 @@
 require File.expand_path(File.join(File.dirname(__FILE__), '..', 'spec_helper'))
 
 describe AASM, '- class level definitions' do
-  it 'should define a class level aasm_initial_state() method on its including class' do
+  it 'should define a class level methods on its including class' do
     Foo.should respond_to(:aasm_initial_state)
-  end
-
-  it 'should define a class level aasm_state() method on its including class' do
     Foo.should respond_to(:aasm_state)
-  end
-
-  it 'should define a class level aasm_event() method on its including class' do
     Foo.should respond_to(:aasm_event)
-  end
-
-  it 'should define a class level aasm_states() method on its including class' do
     Foo.should respond_to(:aasm_states)
-  end
-
-  it 'should define a class level aasm_states_for_select() method on its including class' do
     Foo.should respond_to(:aasm_states_for_select)
-  end
-
-  it 'should define a class level aasm_events() method on its including class' do
     Foo.should respond_to(:aasm_events)
+    Foo.should respond_to(:aasm_from_states_for_state)
   end
-
 end
 
 describe "naming" do
@@ -61,6 +46,13 @@ describe AASM, '- aasm_states_for_select' do
   end
 end
 
+describe "aasm_from_states_for_state" do
+  it "should return all from states for a state" do
+    froms = AuthMachine.aasm_from_states_for_state(:active)
+    [:pending, :passive, :suspended].each {|from| froms.should include(:pending)}
+  end
+end
+
 describe AASM, '- instance level definitions' do
   before(:each) do
     @foo = Foo.new