https://github.com/projecthydra/active_fedora/wiki/Lesson%3A-Define-a-custom-Vocabulary

gistfile1.txt

[vagrant@vagrant-centos70 af-tutorial]$ rails console
Loading development environment (Rails 4.1.8)
irb(main):001:0> class DublinCoreAsset < ActiveFedora::Rdf::Resource
irb(main):002:1> property :title, predicate: RDF::DC.title
irb(main):003:1> end
TypeError: superclass must be a Class (ActiveSupport::Deprecation::DeprecatedConstantProxy given)
	from (irb):1
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/railties-4.1.8/lib/rails/commands/console.rb:90:in `start'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/railties-4.1.8/lib/rails/commands/console.rb:9:in `start'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/railties-4.1.8/lib/rails/commands/commands_tasks.rb:69:in `console'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/railties-4.1.8/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/railties-4.1.8/lib/rails/commands.rb:17:in `<top (required)>'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:247:in `require'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:247:in `block in require'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:232:in `load_dependency'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:247:in `require'
	from /opt/hydra/bin/rails:8:in `<top (required)>'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:241:in `load'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:241:in `block in load'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:232:in `load_dependency'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:241:in `load'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.2.0/lib/spring/commands/rails.rb:6:in `call'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.2.0/lib/spring/command_wrapper.rb:38:in `call'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.2.0/lib/spring/application.rb:183:in `block in serve'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.2.0/lib/spring/application.rb:156:in `fork'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.2.0/lib/spring/application.rb:156:in `serve'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.2.0/lib/spring/application.rb:131:in `block in run'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.2.0/lib/spring/application.rb:125:in `loop'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.2.0/lib/spring/application.rb:125:in `run'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.2.0/lib/spring/application/boot.rb:18:in `<top (required)>'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'