Module: ActsAsSequence::Extension::ClassMethods

Defined in:
lib/acts_as_sequence/extension.rb

Instance Method Summary collapse

Instance Method Details

#acts_as_sequenced(field, sequencer, *args) ⇒ Object 



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# File 'lib/acts_as_sequence/extension.rb', line 9

def acts_as_sequenced(field, sequencer, *args)
  field = field.to_sym
  options = args.extract_options!
  sequence_name = options.delete(:sequence) || "#{field}_#{self.name.underscore}"

  after_initialize do
    write_attribute(field, sequencer.next_sequence_value(sequence_name)) if read_attribute(field).blank? && new_record?
  end

  (class << self; self; end).send(:define_method, :"next_sequence_#{field}") do
    sequencer.next_sequence_value(sequence_name)
  end
end

#acts_as_sequencer ⇒ Object 



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# File 'lib/acts_as_sequence/extension.rb', line 23

def acts_as_sequencer
  class_eval do
    def self.next_sequence_value(sequence)
      raise ArgumentError, "Sequence column #{sequence} not found in model #{name}" unless column_names.include?(sequence.to_s)
      transaction do
        record = first(:lock => true)
        record = create! if record.nil?
        value = record[sequence].to_i
        record[sequence] = value + 1
        record.save!
        value
      end
    end
  end
end