How to set a multidimensional array in a rails session

Question

I am trying to do something like this:

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

but it does not work, I got this error:

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

You need to initialize the [: continent] session first to be a hash. Try the following:

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