如果请求是 xhr，Rails 有没有办法跳过 before_filter? [英] Is there a way in Rails to skip a before_filter if the request is xhr?

问题描述

使用以下代码:

class TestsController < ApplicationController
  skip_before_filter :load_something,      # how to skip these only 
                     :load_something_else  # if the request is xhr ?

  def index
    respond_to do |format|
      format.html
      format.js
    end
  end

end

有没有办法跳过过滤器之前的过滤器，具体取决于请求是否是 javascript 调用而不更改 :load_something 和 :load_something_else 方法?

Is there a way to skip before filters depending if the request is a javascript call without changing the :load_something and :load_something_else methods ?

谢谢！

推荐答案

过去没有干净的解决方案.假设您无法控制 before_filters(或不想更改它们)，我会保留 skip_before_filter 并添加一个额外的 before_filter如果它是 xhr 方法，则仅执行所需的方法.

There used to be no clean solution to this. Assuming you do not have control over the before_filters (or do not want to change them), i would leave the skip_before_filter and add an extra before_filter that only executes the wanted methods if it is an xhr method.

有点像

skip_before_filter :load_something,      # how to skip these only 
                   :load_something_else  # if the request is xhr ?
before_filter :do_loads_if_xhr

def do_loads_if_xhr
  if request.xhr?
    load_something
    load_something_else
  end
end

此处描述的方法仅适用于应用程序的全局条件:仅在创建类时评估条件.不是针对每个请求.

The method described here only works because the conditional is global for the application: the conditional is only evaluated when the class is created. Not on each request.

[更新]然而，有一种更简洁的方法可以使 skip_before_filter 成为条件.像这样写:

[UPDATED] There is however, a cleaner way to make the skip_before_filter conditional. Write it like this:

skip_before_filter :load_something, :load_something_else, :if => proc {|c| request.xhr?}

另请注意，虽然 skip_before_filter 仍然完全受支持，并且没有被弃用，但由于 Rails 4，文档似乎更喜欢(相同的)skip_before_action.此外，文档对此完全不清楚，必须在代码中进行验证.

Also note that while skip_before_filter is still completely supported, and not deprecated, since rails 4 the documentation seems to prefer the (identical) skip_before_action. Also the documentation is totally not clear about this, had to verify in code.

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