gistfile1.rb

# If you ever needed an array of all ActiveRecord models in your Rails app (+ Session):
Dir["app/models/**/*.rb"].each {|r| require r}
subclasses_of(ActiveRecord::Base).map(&:class_name)

# Or *all* models:
ActiveRecord::Base.connection  # Preloads driver constants
constants_before = Object.constants
Dir["app/models/**/*.rb"].each {|r| require r}
Object.constants - constants_before