康康：“可以”方法再次获取记录，即使它们已经获取
我正在尝试传递这样的对象
<% if( can? :change, comment.karma, comment.user_id)%>
#blah blah blah
<% end %>
，在我的能力.rb 中，我有以下内容：
can :change, Karma do |karma, owner_id|
!karma.changers.map(&:user_id).include? user.id and owner_id != user.id
end
每次刷新页面时，cancan 都会触发一个查询（来自ability.rb）以获取业力，然后该业力的改变者，即使我已经获取了它（使用 :include => { :karma => :changers } 选项在控制器中进行查询）。
添加：
我猜测这是因为 karma 存储了指向 :include 对象（而不是对象本身）的链接，当我将其传递给方法时，该链接实际上被破坏了。所以我现在正在考虑连载......
有什么想法吗？
I'm trying to pass an object like that
<% if( can? :change, comment.karma, comment.user_id)%>
#blah blah blah
<% end %>
and in my ability.rb i have the following:
can :change, Karma do |karma, owner_id|
!karma.changers.map(&:user_id).include? user.id and owner_id != user.id
end
And every time I refresh the page cancan fires a query (from ability.rb) to get karma and then changers for that karma, even through I have already fetched it (using :include => { :karma => :changers } option for query in controller).
Added:
I have a guess that it's happening because karma is storing a link to :include objects (not objects itself), which is actually get broken when I pass it to method. So I'm thinking about serialization now..
Any ideas?
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当您在模型中执行查询时，请尝试使用此语法
@comments = Comment.where(:foo_id => Bar.id).includes(:karma => :changers)并查看是否问题仍然存在。
作为参考，http://m.onkey.org/active-record-query-interface< /a> 详细介绍了新的 Rails 3 活动记录查询语法。
When you do the query in the model try using this syntax
@comments = Comment.where(:foo_id => Bar.id).includes(:karma => :changers)and see if the problem persists.
For reference, http://m.onkey.org/active-record-query-interface has a great rundown of the new rails 3 active record querying syntax.