如何在与rails的会话中设置多维数组

Question

我正在尝试做这样的事情：

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

但它不起作用，我收到了这个错误：

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.[]=

Answer 1

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]