class GlobalID::Locator::BaseLocator

def find_records(model_class, ids, options)
  if options[:ignore_missing]
    model_class.where(id: ids)
  else
    model_class.find(ids)
  end
end

def locate(gid)
  gid.model_class.find gid.model_id
end

def locate_many(gids, options = {})
  models_and_ids  = gids.collect { |gid| [ gid.model_class, gid.model_id ] }
  ids_by_model    = models_and_ids.group_by(&:first)
  loaded_by_model = Hash[ids_by_model.map { |model, ids|
    [ model, find_records(model, ids.map(&:last), ignore_missing: options[:ignore_missing]).index_by { |record| record.id.to_s } ]
  }]
  models_and_ids.collect { |(model, id)| loaded_by_model[model][id] }.compact
end