class ApplicationController < ActionController::Base
before_filter :block_ip_addresses
protected
def block_ip_addresses
head :unauthorized if current_ip_address == "XX.XX.XX.XX"
end
def current_ip_address
request.env['HTTP_X_REAL_IP'] || request.env['REMOTE_ADDR']
end
end
Thanks to: https://stackoverflow.com/a/10895438/1466095