class Bullet::Detector::NPlusOneQuery

def call_association(object, associations)

if it is, keeps this unpreload associations and caller.
then, it checks if this associations call is unpreload.
first, it keeps this method call for object.association.
executed when object.associations is called. 
def call_association(object, associations)
  return unless Bullet.start?
  return unless Bullet.n_plus_one_query_enable?
  return unless object.bullet_primary_key_value
  return if inversed_objects.include?(object.bullet_key, associations)
  add_call_object_associations(object, associations)
  Bullet.debug(
    'Detector::NPlusOneQuery#call_association',
    "object: #{object.bullet_key}, associations: #{associations}"
  )
  if !excluded_stacktrace_path? && conditions_met?(object, associations)
    Bullet.debug('detect n + 1 query', "object: #{object.bullet_key}, associations: #{associations}")
    create_notification(caller_in_project(object.bullet_key), object.class.to_s, associations)
  end
end