Refactor settings

db/migrate/20141015135255_create_settings.rb

@@ -0,0 +1,18 @@
+class CreateSettings < ActiveRecord::Migration
+  def self.up
+    drop_table :settings
+    create_table :settings do |t|
+      t.string :var, :null => false
+      t.text   :value, :null => true
+      t.integer :thing_id, :null => true
+      t.string :thing_type, :limit => 30, :null => true
+      t.timestamps
+    end
+
+    add_index :settings, [ :thing_type, :thing_id, :var ], :unique => true
+  end
+
+  def self.down
+    drop_table :settings
+  end
+end