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# Initialize shopping cart.
def initialize_cart
# #1
# --
# if session[:cart_id]
#  @cart = Cart.find(session[:cart_id])
# else
#  @cart = Cart.create
#  session[:cart_id] = @cart.id
# end

# #2
# --
# if session[:cart]
#  @cart = session[:cart]
# else
#  @cart = Cart.create
#  session[:cart] = @cart
# end

# #3
@cart = session[:cart] ||= Cart.create
end

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