diff --git a/lib/ajax-datatables-rails/base.rb b/lib/ajax-datatables-rails/base.rb
index 6f20a7e..220a467 100644
--- a/lib/ajax-datatables-rails/base.rb
+++ b/lib/ajax-datatables-rails/base.rb
@@ -3,9 +3,15 @@
 module AjaxDatatablesRails
   class Base
 
-    class_attribute :db_adapter, default: ::ActiveRecord::Base.connection.adapter_name.downcase.to_sym
+    class_attribute :db_adapter
     class_attribute :nulls_last, default: false
 
+    class << self
+      def db_adapter
+        self.db_adapter = ::ActiveRecord::Base.connection.adapter_name.downcase.to_sym
+      end
+    end
+
     attr_reader :params, :options, :datatable
 
     GLOBAL_SEARCH_DELIMITER = ' '