1 files changed, 40 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/state_machine/state.rb b/activemodel/lib/active_model/state_machine/state.rb
new file mode 100644
index 0000000000..5851a6fb79
--- /dev/null
+++ b/activemodel/lib/active_model/state_machine/state.rb
@@ -0,0 +1,40 @@
+module ActiveModel
+  module StateMachine
+    class State
+      attr_reader :name, :options
+
+      def initialize(machine, name, options={})
+        @machine, @name, @options, @display_name = machine, name, options, options.delete(:display)
+        machine.klass.send(:define_method, "#{name}?") do
+          current_state.to_s == name.to_s
+        end
+      end
+
+      def ==(state)
+        if state.is_a? Symbol
+          name == state
+        else
+          name == state.name
+        end
+      end
+
+      def call_action(action, record)
+        action = @options[action]
+        case action
+        when Symbol, String
+          record.send(action)
+        when Proc
+          action.call(record)
+        end
+      end
+
+      def display_name
+        @display_name ||= name.to_s.gsub(/_/, ' ').capitalize
+      end
+
+      def for_select
+        [display_name, name.to_s]
+      end
+    end
+  end
+end