问题是我在生产环境中随机出现错误,这似乎表明memcached返回了一个不正确的对象.

例子：

在此示例中,current_site是一个帮助方法,它访问Site模型上使用Rails.cache缓存模型的方法

ActionView::TemplateError in ListingsController#edit
undefined method `settings' for #<String:0xb565f8a0>
 
On line #12 of app/views/layouts/site.html.erb
 
    9:         <Meta name="robots" content="noodp,all" />
    10:         <Meta name="distribution" content="Global" />
    11: 
    12:         <% unless current_site.settings[:google_webmaster_verification_code].blank? %>
    13:         <Meta name="verify-v1" content="<%= current_site.settings[:google_webmaster_verification_code] %>" />
    14:         <% end %>
    15:

与…形成对比

ActionView::TemplateError in ApplicationController#not_found
undefined method `settings' for #<Category:0xd5c6c34>
 
On line #12 of app/views/layouts/site.html.erb
 
    9:         <Meta name="robots" content="noodp,all" />
    10:         <Meta name="distribution" content="Global" />
    11: 
    12:         <% unless current_site.settings[:google_webmaster_verification_code].blank? %>
    13:         <Meta name="verify-v1" content="<%= current_site.settings[:google_webmaster_verification_code] %>" />
    14:         <% end %>
    15:

两者都应该返回站点模型！

另一个缓存行为的例子很奇怪：

ActionView::TemplateError in AccountsController#show
can't convert Category into String
 
On line #141 of app/views/layouts/site.html.erb
 
    138:                    <li<%=  class="first" if i == 0 %>><%= link_to top_level_category.title,top_level_category.path %></li><% end %>
    139:                </ul>
    140:            <% end %>
    141:            <% cache bottom_pages do %>
    142:                <ul><% Page.top_level.active.show_in_navigation.find(:all,:include => :slugs).each_with_index do |top_level_page,i| %>
    143:                    <li<%=  class="first" if i == 0 %>><%= link_to top_level_page.title,top_level_page.path %></li><% end %>
    144:                </ul>

有没有人遇到过这样的事情？任何人都有想法诊断这个无法解释的问题！？我已经尝试切换出memcached客户端宝石,想想也许这是一个奇怪的错误,但这没有任何影响！谢谢.