generate_composite_primary_key

# File activerecord/lib/active_record/fixture_set/table_row.rb, line 127
        def generate_composite_primary_key
          composite_key = ActiveRecord::FixtureSet.composite_identify(@label, model_metadata.primary_key_name)
          composite_key.each do |column, value|
            next if column_defined?(column)

            @row[column] = value
          end
        end