class ActiveRecord::FixtureSet::File

def validate_config_row(data)
  unless Hash === data
    raise Fixture::FormatError, "Invalid `_fixture` section: `_fixture` must be a hash: #{@file}"
  end
  begin
    data.assert_valid_keys("model_class", "ignore")
  rescue ArgumentError => error
    raise Fixture::FormatError, "Invalid `_fixture` section: #{error.message}: #{@file}"
  end
  data
end