How do I get all the classes that descend from a parent class ? I found
solution on
Look up all descendants of a class in Ruby - Stack Overflow.
But I want to know, is there a standard method or not?
No there is not.
7stud – wrote in post #1000123:
No there is not.
THX
class Animal
def self.inherited(subclass)
children << subclass
end
def self.children
@children ||= []
end
def self.descendants
children.map do |child|
[child].concat child.descendants
end.flatten
end
end
Dog = Class.new Animal
Cat = Class.new Animal
Tabby = Class.new Cat
RUBY_VERSION # => “1.9.2”
Animal.children # => [Dog, Cat]
Animal.descendants # => [Dog, Cat, Tabby]
Cat.descendants # => [Tabby]
On Sun, May 22, 2011 at 12:11 PM, Josh C. [email protected]
wrote:
def self.descendants
RUBY_VERSION # => “1.9.2”
Animal.children # => [Dog, Cat]
Animal.descendants # => [Dog, Cat, Tabby]Cat.descendants # => [Tabby]
Accidentally pasted the code over the entire response >.<
I meant to say you could whip something up without too much effort (as
7stud
said, there is no standard way).