如何在ruby中覆盖[]括号？

问题描述

 <％= collection_select（作业，清除，@allClearances，清除，清除，{：提示=>选择清除}）％> ;然后，Ruby将使用 id =Jobs_clearance创建一个HTML选择标记



和 name =Jobs [clearance]

我想将参数发送到我的控制器，如下所示：

 类JobsController< ApplicationController 
 def foo 
 @clearance = params [：Jobs [clearance]] 
 end 
  

不幸的是，Ruby只读取：Jobs作为符号，而不是：Jobs [clearance]

有没有办法逃避 [] 的？反斜杠不起作用

解决方案

您需要使用 params [：Jobs] [：clearance]

params 是所有请求参数的哈希值。但是 params [：Jobs ]也是全部的哈希：作业参数。所以调用 params [：Jobs] [：清除] 正在调用的 [] > params [：Jobs] object passing ：clearance in作为参数。

I am writing an Ajax request form with Ruby on Rails using a collection_select tag that looks like this:

<%= collection_select("Jobs", "clearance", @allClearances, "clearance", "clearance", {:prompt => "Select a Clearance"} )%>

Ruby then builds an HTML select tag with id = "Jobs_clearance" and name = "Jobs[clearance]"

I want to send the parameter to my controller, which looks like this:

class JobsController < ApplicationController
  def foo
    @clearance = params[:Jobs[clearance]]
  end

Unfortunately, Ruby only reads ":Jobs" as the symbol instead of ":Jobs[clearance]"
Is there a way to escape the []'s? backslash isn't working.

解决方案

You need to use params[:Jobs][:clearance]

params is a hash of all the request parameters. But params[:Jobs] is ALSO a hash of all :Jobs parameters. So calling params[:Jobs][:clearance] is calling the [] method on the params[:Jobs] object passing :clearance in as a parameter.

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