我收到以下错误:
ActionView::TemplateError (You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.include?) on line #24 of app/views/index/index.html.erb:
21: <% @achievements.each do |achievement| %>
22: <%= achievement.name %>
23: <%= achievement.level %>
24: by <%= achievement.user.username %><br/>
25: <% end %>
奇怪的是,第一次加载索引页面时,没有任何问题。当我刷新时,我收到上面的错误。
控制器如下所示:
class IndexController < ApplicationController
def index
@achievements = Achievement.find(:all)
end
end
它与缓存有关吗?还是它使用了太多的内存?如果是这样,我可以用另一种方式加载用户名吗?我很困惑!