respond_to 新构想
respond_to 非常好用，可以根据不同的 format 来选择不同的应答策略，并且自动设置相应的 MIME 值，看上去也非常爽目。
在 Blog 系统中，比如文章的 RSS，就可以：
-
def index
-
@posts = Post.find(:all)
-
respond_to do |format|
-
format.html { ...}
-
format.rss {...}
-
end
-
end
这样比在单独构建一个 RSS action 要好得多～
不过，如果 Blog 通过 html 显示出来的话，还需要做其他一些事情，比如构建 Blog 的各个边栏，这些事情一般都放在 before_filter 中去做：
-
class PostsController < ApplicationController
-
before_filter :get_sidebars
-
...
但是这些工作在 RSS 中完全不需要，那么怎么在 RSS 忽略掉这些工作呢？
一个选择就是去掉 before_filter，把 get_sidebars 写入到 format.html { } 中去，这样的话，PostsController 里面每个 action 的 format.html 都要这样做，不是啥好办法。
第二个选择就是在 get_sidebars 里面检测 format：
-
def get_sidebars
-
if params[:format] == "html"
-
...create sidebars
这样似乎还算 ok，其他的方法还没有想出来……
前两天，正好看到 maiha 写的新 respond_to 表示方法的构想，去掉 respond_to 那个 block，而按照 aciton.format 的格式，把不同 format 的处理，放到单独的函数中去：
-
def index
-
@posts = Post.find(:all)
-
end
-
-
def index.html
-
...
-
end
-
-
def index.rss
-
...
-
end
这样看上去比 respond_to 清晰了很多，如果可以实现，那么如果在 before_filter 里面也可以：
-
before_filter :get_sidebars, :only => "*.html"
就能完美的解决上面的问题了～ 
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