Inheritance does not affect method visibility
Contrary to visibility conventions in other languages such as Java, Ruby methods defined under a
block in a class definition are still accessible by that class’ children:
class Foo private def private_method! p "Hello world!" end end class Bar < Foo def uses_private_method private_method! end end b = Bar.new b.uses_private_method # => "Hello world!"
This is because the
private keyword in Ruby has nothing to do with inheritance;
declaring a method as
private only adds the restriction that it may not be invoked
with an explicit receiver, as illustrated below:
class Quux < Foo def explicit_receiver self.private_method! end def implicit_receiver private_method! end end q = Quux.new q.explicit_receiver # => NoMethodError: private method `private_method!' called for #<Quux:0x007fee689e0ff8> q.implicit_receiver # => "Hello world!"