FEATURE: New "Dropdown" user field type

db/migrate/20150727193414_create_user_field_options.rb

@@ -0,0 +1,9 @@
+class CreateUserFieldOptions < ActiveRecord::Migration
+  def change
+    create_table :user_field_options do |t|
+      t.references :user_field, null: false
+      t.string :value, null: false
+      t.timestamps
+    end
+  end
+end