add_join_records

# File activerecord/lib/active_record/fixture_set/table_row.rb, line 186
        def add_join_records(association)
          # This is the case when the join table has no fixtures file
          if (targets = @row.delete(association.name.to_s))
            table_name  = association.join_table
            column_type = association.primary_key_type
            lhs_key     = association.lhs_key
            rhs_key     = association.rhs_key

            targets = targets.is_a?(Array) ? targets : targets.split(/\s*,\s*/)
            joins   = targets.map do |target|
              join = { lhs_key => @row[model_metadata.primary_key_name],
                       rhs_key => ActiveRecord::FixtureSet.identify(target, column_type) }
              association.timestamp_column_names.each do |col|
                join[col] = @now
              end
              join
            end
            @table_rows.tables[table_name].concat(joins)
          end
        end