thoughtbot--factory_bot/lib/factory_girl/sequence.rb

module FactoryGirl

  # Raised when calling Factory.sequence from a dynamic attribute block
  class SequenceAbuseError < StandardError; end

  # Sequences are defined using sequence within a FactoryGirl.define block.
  # Sequence values are generated using next.
  class Sequence

    def initialize(value = 1, &proc) #:nodoc:
      @proc  = proc
      @value = value || 1
    end

    # Returns the next value for this sequence
    def next
      @proc ? @proc.call(@value) : @value
    ensure
      @value = @value.next
    end

  end

  class << self
    attr_accessor :sequences #:nodoc:
  end
  self.sequences = {}
end