Quick alternate implementation for Dataset#query.

gistfile1.rb

module Sequel
  class Dataset
    class Query
      attr_reader :dataset

      def initialize(dataset)
        @dataset = dataset
      end

      def method_missing(method, *args, &block)
        @dataset = @dataset.send(method, *args, &block)
        self
      end
    end

    def query(&block)
      Query.new(self).instance_eval(&block).dataset
    end
  end
end