You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: railtie.rb
    path of file: ./repos/bugsnag-ruby/lib/bugsnag/integrations
    
    the code of the file until where you have to start completion: # Rails 3.x hooks

require "json"
require "rails"
require "bugsnag"
require "bugsnag/middleware/rails3_request"
require "bugsnag/middleware/rack_request"
require "bugsnag/integrations/rails/rails_breadcrumbs"

module Bug
    
    def event_subscription(event)
      ActiveSupport::Notifications.subscribe(event[:id]) do |*, event_id, data|
        filtered_data = data.slice(*event[:allowed_data])
        filtered_data[:event_name] = event[:id]
        filtered_data[:event_id] = event_id

        case event[:id]
        when "sql.active_record"
          if data.key?(:binds)
            binds = data[:binds].each_with_object({}) { |bind, output| output[bind.name] = '?' if defined?(bind.name) }
            filtered_data[:binds] = JSON.dump(binds) unless binds.empty?
          end

          # Rails < 6.1 included connection_id in the event data, but now
          # includes the connection object instead
          if data.key?(:connection) && !data.key?(:connection_id)
            # the connection ID is the object_id of the connection object
            filtered_data[:connection_id] = data[:connection].object_id
          end