acts_as_untitled.gemspec

Gem::Specification.new do |s|
  s.name        = 'acts_as_untitled'
  s.version     = '0.1.0'
  s.platform    = Gem::Platform::RUBY
  s.author      = 'Edward Tsech'
  s.email       = 'edtsech@gmail.com'
  s.summary     = 'Acts as untitled!'
  s.description = ''

  s.files         = ['acts_as_untitled.rb']
  s.test_file     = 'acts_as_untitled_test.rb'
  s.require_path  = '.'
end

acts_as_untitled.rb

module ActiveRecord
  module Acts
    module Untitled
      extend ActiveSupport::Concern

      module ClassMethods
        def acts_as_untitled(attr = :title, placeholder = nil)
          placeholder ||= 'Untitled #{self.class.to_s.downcase}'

          class_eval <<-EOV
            before_save lambda {
              self.send(:#{attr}=, "#{placeholder}") unless self.send(:#{attr}).present?
            }
          EOV
        end
      end
    end
  end
end

ActiveRecord::Base.class_eval { include ActiveRecord::Acts::Untitled }

acts_as_untitled_test.rb

require 'rubygems'
require 'active_record'
require 'test/unit'
require File.expand_path('acts_as_untitled')

# The database
ActiveRecord::Base.establish_connection(:adapter => "sqlite3", :database => ":memory:")
ActiveRecord::Schema.define(:version => 1) do
  create_table :posts do |t|
    t.string :title
  end

  create_table :projects do |t|
    t.string :name
  end

  create_table :items do |t|
    t.string :name
  end
end

# Models
class Post < ActiveRecord::Base
  acts_as_untitled
end

class Project < ActiveRecord::Base
  acts_as_untitled :name
end

class Item < ActiveRecord::Base
  acts_as_untitled :name, "Blah blah"
end

# Tests
class ActsAsUntitledTest < Test::Unit::TestCase
  def test_acts_as_untitled
    assert_equal Post.create.title, 'Untitled post'
  end

  def test_acts_as_untitled_with_custom_attr
    assert_equal Project.create.name, 'Untitled project'
  end

  def test_acts_as_untitled_with_placeholder
    assert_equal Item.create.name, 'Blah blah'
  end
end