# File lib/postgres_ext/active_record/relation/query_methods.rb, line 16
      def contains(opts, *rest)
        build_where_chain(opts, rest) do |rel|
          case rel
          when Arel::Nodes::In, Arel::Nodes::Equality
            column = left_column(rel) || column_from_association(rel)
            equality_for_hstore(rel) if column.type == :hstore

            if column.type == :hstore
              Arel::Nodes::ContainsHStore.new(rel.left, rel.right)
            elsif column.respond_to?(:array) && column.array
              Arel::Nodes::ContainsArray.new(rel.left, rel.right)
            else
              Arel::Nodes::ContainsINet.new(rel.left, rel.right)
            end
          else
            raise ArgumentError, "Invalid argument for .where.overlap(), got #{rel.class}"
          end
        end
      end