Integration ExceptionNotification into app

controllers_application.rb

if Rails.env.production?
  rescue_from Exception, with: :render_500
  rescue_from ActiveRecord::RecordNotFound, ActionController::RoutingError, :with => :render_404
else
  rescue_from ActiveRecord::RecordInvalid, :with => :show_errors
end

def render_500(exception)
  respond_to do |format|
    ExceptionNotifier::Notifier.exception_notification(request.env, exception).deliver
    format.html { render :layout=>'500',:nothing => true, status: 500 }
    format.all { render nothing: true, status: 500}
  end
end
def show_errors(e)
  I18n.with_locale(:en) do
    e.record.valid?
    raise e.record.errors.full_messages.join("\n        ")
  end
end

Gemfile

gem 'exception_notification', :require => 'exception_notifier'

production.rb

config.middleware.use ExceptionNotifier,
         :email_prefix => "[StyleUp Exception ] ",
         :sender_address => %{"styleup_bot" <no_reply@styleup.ua>},
         :exception_recipients => %w{some_mail@gmail.com another_mail@gmail.com}