Rails:与 Hash#to_param 相反 [英] Rails: Opposite of Hash#to_param

问题描述

如果我将哈希转换为查询字符串，如何再次将其转换回来?

If I convert a hash to a query string, how can I convert it back again?

{:filters => {:colour => ['Red', 'Blue'], :size => 'Medium'}}.to_param
=> "filters[colour][]=Red&filters[colour][]=Blue&filters[size]=Medium"

Rails 在填充 params 哈希时似乎会自动执行此操作，但是否可以直接调用此方法?

Rails appears to do this automatically when it populates the params hash, but is it possible to call this method directly?

谢谢.

推荐答案

您正在寻找 Rack::Utils.parse_nested_query(query)，它将把它转换回 Hash.您可以使用此行获取它:

You're looking for Rack::Utils.parse_nested_query(query), which will convert it back into a Hash. You can get it by using this line:

require 'rack/utils'

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