get the fixture label of a given record

gistfile1.rb

# fixture_label_of_record(shops(:snowdevil))
# => "snowdevil"

class ActiveSupport::TestCase
  def fixture_label_of_record(record)
    yaml_file = fixture_path + record.class.table_name + '.yml'
    labels = YAML.load(File.read(yaml_file)).keys
    labels.find {|l| Fixtures.identify(l) == record[record.class.primary_key]}
  end
end