ActiveRecord::DomId
===================

An action-model_id convention for Active Record dom ids.

Models are underscored and suffixed with their _id or _new.
The hyphen-prefixed action is optional.

  class RepoMan < ActiveRecord::Base
  end

  # collection
  assert_equal 'repo_men', RepoMan.dom_id

  # new instance in collection
  assert_equal 'repo_man_new', RepoMan.new.dom_id
  assert_equal 'hire-repo_man_new', RepoMan.new.dom_id(:hire)

  # ordinary instance
  assert_equal 'repo_man_1', RepoMan.find(1).dom_id
  assert_equal 'edit-repo_man_1', RepoMan.find(1).dom_id(:edit)


Other classes can keep a consistent action-entity_id pattern:

  class Cart
    # assert_equal 'cart', Cart.new.dom_id
    # assert_equal 'edit-cart', Cart.new.dom_id(:edit)
    def dom_id(action = nil)
      action ?  "#{action}-cart" : 'cart'
    end
  end

Inspired by Jamis Buck's AR::B#dom_id.