class DatabaseCleaner::Cleaner

def self.available_strategies(orm_module)
  # introspect publically available constants for descendents of Strategy to get list of strategies
  # ignore classes named Base, because its a common name for a shared base class that adds ORM access stuff to Strategy before being inherited by final concrete class
  # if you're writing an adapter and this method is falsely returning an internal constant that isn't a valid strategy, consider making it private with Module#private_constant.
  orm_module.constants.select do |constant_name|
    ancestors = orm_module.const_get(constant_name).ancestors rescue []
    ancestors.include?(DatabaseCleaner::Strategy)
  end.map do |constant_name|
    underscore(constant_name).to_sym
  end - [:base]
end