DataMapper::Adapters::YamlAdapterAdjust

# File lib/dm-adjust/adapters/yaml_adapter.rb, line 4
def adjust(attributes, collection)
  attributes = attributes_as_fields(attributes)

  update_records(collection.model) do |records|
    records_to_update = collection.query.filter_records(records.dup)
    records_to_update.each do |record|
      record.update(attributes) do |key, oldvalue, newvalue|
        (oldvalue || 0) + newvalue
      end
    end.size
  end
end