handling_rails_exceptions.md

# application.rb:

config.exceptions_app = lambda do |env|
  exception   = env['action_dispatch.exception']
  params      = env['action_dispatch.request.parameters']
  request     = Rack::Request.new(env)
  status_code = ActionDispatch::ExceptionWrapper.new(env, exception).status_code
  
  Rails.logger.info [
    "Exception: #{exception}",
    "fullpath=#{request.fullpath}",
    "params=#{params}"
  ].join(" - ")
end