title: How to get all class names in a namespace in Ruby?
body: <p>I have a module <code>Foo</code>, that it is the namespace for many classes like <code>Foo::Bar</code>, <code>Foo::Baz</code> and so on.</p>
  
  <p>Is there an way to return all class names namespaced by <code>Foo</code>?</p>