rails 3.2.0只有在json格式时才会跳过过滤器

Question

1. skip_before_filter :authorize, :only => [:index,:show], :if => proc {|c| request.json?}

2. skip_before_filter :authorize, :only => [:index,:show], :if => :format_json?

    def format_json?
      request.format.json?
    end   

3. skip_before_filter :authorize, :only => [:index, :show] , :if =>request.content_type == "json"
for the first request it is showing:
    #undefined local variable or method `request' for ExamsController:Class
If i refresh the page it is not skipping anyting 

我想跳过＆＃34; index＆＃34;的身份验证并且＆＃34;显示＆＃34;仅当请求内容为json时才执行操作。我尝试了上面的例子，但没有任何工作。任何建议都会有所帮助。

Answer 1

class XXXXController < ApplicationController
  skip_before_filter :authorize, :only => [:index,:show], if: :json_request?

  #your other actions here. 

  private 
  def json_request?
    request.format.symbol == :json
  end
end

在我的情况下，我尝试跟随我的行动＆amp;格式经验证为：json type：

$(document).on('ready', function(){

   $('body').on('submit', '#new_job', function(e){
    e.preventDefault();

    $.ajax({
      dataType: "json",
      url: '/jobs/',
      type: 'post',
      success: function(data){
        console.log("registered success");
      },
      failure: function(error){
        console.log("This is the failure block ");
      }
    });
   });
});

Answer 2

这应该解决它

skip_before_filter :authorize, :only => [:index,:show], :if => Proc.new {|c| c.request.format.json?}

您需要执行Proc.new，然后使用本地变量c并访问格式。

Answer 3

对于Rails 3，您想这样做

class XXXXController < ApplicationController
  skip_before_filter :authorize, if: :public_request?

  #your other actions here. 

  private
  def public_request?
    # action_name is a rails method that returns the requested action
    public_action = (action_name == 'show' or action_name == 'index' )
    return ( public_action and request.format.symbol == :json )
  end
end