add state machine to context including a closed state

db/migrate/20130227205845_add_state_to_context.rb

@@ -0,0 +1,22 @@
+class AddStateToContext < ActiveRecord::Migration
+
+  class Context < ActiveRecord::Base
+  end
+
+  def up
+    add_column :contexts, :state, :string, :limit => 20, :null => false
+    Context.reset_column_information
+    Context.all.each do |c|
+		c.state = c.hide ? 'hidden' : 'active'
+		c.save!
+    end
+    remove_column :contexts, :hide
+  end
+
+  def down
+  	add_column :contexts, :hide, :boolean, :default => false
+    Context.reset_column_information
+  	Context.all.each { |c| c.hide = ( c.state == 'hidden' ) }
+  	remove_column :contexts, :state
+  end
+end