ruby-on-rails – 如何在与rails的会话中设置多维数组

我想做这样的事情：

session[:continent][:filter] = params[:filter]

但它不起作用,我得到了这个错误：

You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.[]=

解决方法

您需要首先将会话[：continent]初始化为哈希.试试这个：

session[:continent] ||= {}
session[:continent][:filter] = params[:filter]