重写url_helper link_to_unless方法，给Kaminari当前页添加样式

config/initializers/url_helper.rb

@@ -0,0 +1,22 @@
+# Time 2015-01-30 17:02:41
+# Author lizanle
+# Description 打开redmine\ruby\lib\ruby\gems\1.9.1\gems\actionpack-3.2.13\lib\action_view\helpers\UrlHelper，重写link_to_unless方法
+# 如果是当前页，则给当前页添加样式：class=>'current-page'
+module ActionView
+  # = Action View URL Helpers
+  module Helpers #:nodoc:
+    # Provides a set of methods for making links and getting URLs that
+    # depend on the routing subsystem (see ActionDispatch::Routing).
+    # This allows you to use the same format for links in views
+    # and controllers.
+    module UrlHelper
+      def link_to_unless(condition, name, options = {}, html_options = {}, &block)
+        if condition
+          link_to(name, options, html_options.merge(:class => 'current-page'))
+        else
+          link_to(name, options, html_options)
+        end
+      end
+    end
+  end
+end