Rails无法将不允许的参数转换为哈希 [英] Rails Unable to convert unpermitted parameters to hash

问题描述

我正在尝试为我的webapp实现简单的搜索和排序.我正在关注 railscast 和此

I am trying to implement a simple search and sort for my webapp. I am following the railscast and this railscast.

我用作链接的可排序函数的应用程序助手是:

My application helper for sortable function which I am using as link is:

def sortable(column, title = nil)
      title ||= column.titleize
      css_class = column == sort_column ? "current #{sort_direction}" : nil
      direction = column == sort_column && sort_direction == "asc" ? "desc" : "asc"
      link_to title, params.merge(:sort => column, :direction => direction, :page => nil), {:class => css_class}
    end

我在视图中使用这些.在控制器中，我将白名单用作:

I am using these in the view. In the controller I am using white listing as:

 @listingssearch.where(:vehicletype => 'Car').order(sort_column + " " + sort_direction).paginate(:page => params[:page], :per_page => 30)

消毒的专用方法:

 private
     def sort_column
          Listing.column_names.include?(params) ? params[:sort] : "rateperhour"
        end

        def sort_direction
          %w[asc desc].include?(params[:direction]) ? params[:direction] : "asc"
        end

我尝试在私有方法中使用合并:

I tried using merge in the private method:

(Listing.column_names + params) but its not working 

对于辅助方法尝试向排序链接提供搜索参数时出现错误:无法将不允许的参数转换为哈希

For the helper methods I am getting an error when I am trying to provide search params to the sorting link: unable to convert unpermitted parameters to hash

它显示错误是由于合并

link_to title, params.merge(:sort => column, :direction => direction, :page => nil), {:class => css_class}

反之也可以:

<%= bootstrap_form_for listings_path, :method => 'get' do %>

        <%= hidden_field_tag :direction, :value => params[:direction] %>
        <%= hidden_field_tag :sort,:value => params[:sort] %>



        <div class= "col-sm-12 col-lg-12 col-md-12" style = "margin: auto;">
            <h6 style = "color:#7C064D;"><strong> PICK A DATE  <span class="glyphicon glyphicon-calendar"></span></strong>
            <%= date_field_tag :startdate, params[:startdate], placeholder: 'DATE' %>           
            </h6>
        </div>  

        <div class= "col-sm-12 col-lg-12 col-md-12" style = "margin: auto;">    
        <p>     
            <%= text_field_tag :near, params[:near], placeholder: ' Destination' %>
            <%= text_field_tag :radius, params[:radius], placeholder: ' Search Radius' %>
        </p>
        </div>      
        <div class= "col-sm-12 col-lg-12 col-md-12" style = "margin: auto;">    
        <p>     
            <%= text_field_tag :min, params[:min], placeholder: ' Minimum Rate Per Hour' %>
            <%= text_field_tag :max, params[:max], placeholder: ' Maximum Rate Per Hour' %>
        </p>
        </div>

        <div class= "col-sm-12 col-lg-12 col-md-12" style = "margin-top: 10px;">        
            <%= submit_tag "Search", class: "btn btn-info", style: "width: 40%; background-color: #E20049; border: #e20049;" %>
            <%= link_to 'View All', root_path, class: "btn btn-info", style: "width: 40%; background-color: #E20049; border: #e20049;" %>
        </div>

        <!-- <div class= "col-sm-6 col-lg-6 col-md-6" style = "margin-top: 10px;">      

        </div> -->


    <% end %>

我的问题是如何在Rails 5中的搜索助手方法中持久保存搜索参数?我在做什么错了?

推荐答案

在Rails 5中，ActionController::Parameters不再继承自Hash，以阻止人们对请求参数使用与Hash相关的方法而不明确过滤它们.

In Rails 5, ActionController::Parameters no longer inherits from Hash, in an attempt to discourage people from using Hash-related methods on the request parameters without explicitly filtering them.

作为此拉取请求的一部分，该请求被反向移植到Rails 5.1中，并部分移植到Rails 5.1中在Rails 5.0中，如果尝试在参数对象上调用to_h而不调用permit，则会引发异常.

As part of this pull request, which was backported into Rails 5.1 and partially into Rails 5.0, an exception is raised if you try to call to_h on the parameters object without calling permit.

在原始params对象(params.merge(:sort => column, :direction => direction, :page => nil))上调用merge会返回具有相同permitted状态(即尚未在其上调用permit)的新ActionController::Parameters对象.然后，link_to方法最终对该对象调用to_h，从而引发异常.

Calling merge on the original params object (params.merge(:sort => column, :direction => direction, :page => nil)) returns a new ActionController::Parameters object with the same permitted status (that is, permit has not been called on it). The link_to method then ends up calling to_h on that object, which raises the exception.

如果知道链接中应允许使用哪些参数，则可以使用列出的参数调用permit.

If you know which parameters should be allowed in the link, you can call permit with those listed.

params.permit(:param_1, :param_2).merge(:sort => column, :direction => direction, :page => nil)
# OR
params.merge(:sort => column, :direction => direction, :page => nil).permit(:param_1, :param_2, :sort, :direction, :page)

如果您不知道链接中可以包含哪些参数，则可以调用request.parameters.merge(...)(如此答案)或params.to_unsafe_h.merge(...).但是，正如注释中指出的那样，当将结果传递给link_to时，这会带来安全风险，因为像host这样的参数将被解释为链接的实际主机，而不是查询参数. link_to中还有其他几个键也具有特殊含义(url_for接受的所有键，再加上:method)，因此通常这是一种冒险的方法.

If you don't know which parameters could be included in the link, then it's possible to call request.parameters.merge(...) (as mentioned in this answer) or params.to_unsafe_h.merge(...). However, as pointed out in comments, this is a security risk when the result is passed to link_to, as a parameter like host would be interpreted as the actual host for the link instead of a query parameter. There are several other keys that also have special meaning in link_to (everything accepted by url_for, plus :method), so it's generally a risky approach.

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