如何指定执行before_filters的顺序？ [英] How can I specify the order that before_filters are executed?

问题描述

rails是否对使用以下两种用法之一执行过滤器之前的顺序做出任何保证：

Does rails make any guarantees about the order that before filters get executed with either of the following usages:

before_filter [:fn1, :fn2]

或

before_filter :fn1
before_filter :fn2

I' d感谢任何帮助。

I'd appreciate any help.

推荐答案

如果您引用 http://api.rubyonrails.org/v2.3.8/classes/ActionController/Filters/ClassMethods.html ，有一个子标题为过滤器链排序，下面是示例代码：

If you refer http://api.rubyonrails.org/v2.3.8/classes/ActionController/Filters/ClassMethods.html, there is a subheading called "Filter chain ordering", here is the example code from that:

class ShoppingController < ActionController::Base
    before_filter :verify_open_shop

class CheckoutController < ShoppingController
    prepend_before_filter :ensure_items_in_cart, :ensure_items_in_stock

根据解释：

CheckoutController 的过滤器链现在为
：ensure_items_in_cart ，：ensure_items_in_stock ，
：verify_open_shop。

The filter chain for the CheckoutController is now :ensure_items_in_cart, :ensure_items_in_stock, :verify_open_shop.

因此您可以像这样明确地给出过滤器链的顺序。

So you can explicitly give the order of the filter chain like that.

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