generate_primary_key

# File activerecord/lib/active_record/fixture_set/table_row.rb, line 92
        def generate_primary_key
          # generate a primary key if necessary
          if model_metadata.has_primary_key_column? && !@row.include?(model_metadata.primary_key_name)
            @row[model_metadata.primary_key_name] = ActiveRecord::FixtureSet.identify(
              @label, model_metadata.primary_key_type
            )
          end
        end