Ruby inherited callback runs before subclass is loaded

Harrumph.

I wanted to call a class method on a subclass when the base class’s inherited callback is triggered.

But it doesn’t work, because the subclass isn’t loaded when this callback is triggered.

So the following doesn’t work (’boo’ prints instead of ‘foo’):

class Base
  def self.permalink
    'boo'
  end
  def self.inherited(c)
    puts "permalink: #{c.permalink}"
  end
end

class C < Base
  def self.permalink
    'foo'
  end
end

You may be able to get what you want by forcing the class to load with Class.new:

class Base
  def self.permalink
    'boo'
  end
  def self.inherited(c)
    puts "permalink: #{c.permalink}"
  end
end

C = Class.new(Base) do
  def self.permalink
    'foo'
  end
end