preload_has_and_belongs_to_many_association

# File activerecord/lib/active_record/association_preload.rb, line 187
      def preload_has_and_belongs_to_many_association(records, reflection, preload_options={})
        table_name = reflection.klass.quoted_table_name
        id_to_record_map, ids = construct_id_map(records)
        records.each {|record| record.send(reflection.name).loaded}
        options = reflection.options

        conditions = "t0.#{reflection.primary_key_name} #{in_or_equals_for_ids(ids)}"
        conditions << append_conditions(reflection, preload_options)

        associated_records = reflection.klass.unscoped.where([conditions, ids]).
            includes(options[:include]).
            joins("INNER JOIN #{connection.quote_table_name options[:join_table]} t0 ON #{reflection.klass.quoted_table_name}.#{reflection.klass.primary_key} = t0.#{reflection.association_foreign_key}").
            select("#{options[:select] || table_name+'.*'}, t0.#{reflection.primary_key_name} as the_parent_record_id").
            order(options[:order]).to_a

        set_association_collection_records(id_to_record_map, reflection.name, associated_records, 'the_parent_record_id')
      end