Pass a block of code to `while_enabled` to sniff out any SQL queries it might be making.

sql_canary.rb

class SqlCanary
  def self.enable!
    Thread.current[:sql_canary] = true
  end

  def self.disable!
    Thread.current[:sql_canary] = false
  end

  def self.enabled?
    Thread.current[:sql_canary] || false
  end

  def self.while_enabled
    SqlCanary.enable!
    yield
  ensure
    SqlCanary.disable!
  end
end

ActiveSupport::Notifications.subscribe('sql.active_record') do |_name, _start, _finish, _id, payload|
  if SqlCanary.enabled? && payload[:sql] && payload[:sql].start_with?('SELECT')
    raise StandardError.new <<-MSG
      The code change you have made has caused a database query inside a V3 presenter.
      This has the potential to cause n+1 queries. The sql you tried to execute was:
      #{payload[:sql]}
      Make sure that you have updated the V3 presenter's "association" method with the proper
      resources to preload.
    MSG
  #else
    #puts payload
  end
end