From: John Merlino <stoicism1@...>
Date: 2011-10-10T06:28:52+09:00
Subject: assigning session hash to a variable doesn't keep modified hash in session

Hey all,

I basically have some nested hashes stored in the session variable:

def set_code(unit_id, code)

     if session[:code].select {|h| h[unit_id]}.empty?
       session[:code] << { unit_id => {}}
     end

      case code
      when 3,4
        session[:code].detect {|h| h[unit_id]}[unit_id][:code_a] ||= []
        session[:code].detect {|h| h[unit_id]}[unit_id][:code_a] << code
      when 8,9
        session[:code].detect {|h| h[unit_id]}[unit_id][:code_b] ||= []
        session[:code].detect {|h| h[unit_id]}[unit_id][:code_b] << code
      end
  end


From the code above, you can see four lines of repetitive code. The
problem is if I did this:

unit_hash = session[:code].detect {|h| h[unit_id]}[unit_id]

case code
when 3,4
  unit_hash[:code_a] ||= []
  unit_hash[:code_a] << code
when 8,9
  unit_hash[:code_b] ||= []
  unit_hash[:code_b] << code
end

Then the appended code will not be stored in the session.

Any way to refactor this so I dont have 4 repetitive lines of code?

Thanks for response

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