count_queries.rb

  # Debugging helper, useful while fixing N+1 problems
  # Based on https://gist.github.com/crazymykl/b526e0ed6b285b3c4e77
  def count_queries(log: false, &block)
    ActiveRecord::Base.logger = Logger.new(STDOUT) if log

    query_count = 0
    increment_count = -> (*) { query_count += 1 }
    ActiveSupport::Notifications.subscribed(increment_count, 'sql.active_record', &block)
    query_count
  end