gistfile1.rb

module Upsertable
  def upsert_added!
    @upsert_added = true
  end

  def upsert_added?
    @upsert_added
  end

  def upsert_updated!
    @upsert_updated = true
  end

  def upsert_updated?
    @upsert_updated
  end
end

def upsert(key, attributes)
  conditions = {}
  key.each do |k|
    value = attributes.fetch(k)
    conditions[k] = value
  end

  record = records.first(:conditions => conditions)
  if record
    updated = true
  else
    record = records.build
  end

  record.extend Upsertable
  if updated
    record.upsert_updated!
  else
    record.upsert_added!
  end

  record.attributes = attributes
  record.save!
  record
end