Contents

# This source file contains code for a basic sequential surrogate key generator

module ETL #:nodoc:
  module Generator #:nodoc:
    # Surrogate key generator.
    class SurrogateKeyGenerator < Generator
      # Initialize the generator
      def initialize(options={})
        if options[:query]
          @surrogate_key = ETL::ActiveRecord::Base.connection.select_value(options[:query])
          @surrogate_key = 0 if @surrogate_key.blank?
          @surrogate_key = @surrogate_key.to_i
        end
      end

      # Get the next surrogate key
      def next
        @surrogate_key ||= 0
        @surrogate_key += 1
      end
    end
  end
end

Version data entries

5 entries across 5 versions & 1 rubygems

Version	Path
activewarehouse-etl-0.8.0	lib/etl/generator/surrogate_key_generator.rb
activewarehouse-etl-0.8.1	lib/etl/generator/surrogate_key_generator.rb
activewarehouse-etl-0.8.2	lib/etl/generator/surrogate_key_generator.rb
activewarehouse-etl-0.8.3	lib/etl/generator/surrogate_key_generator.rb
activewarehouse-etl-0.8.4	lib/etl/generator/surrogate_key_generator.rb