Class-Level Method Chaining Using extend instead of include/ClassMethod module (See related posts)

module ForeignKeyMigrations::Schema

  def self.extended(object)
    class << object
      alias_method :define_without_fk, :define unless method_defined?(:define_without_fk)
      alias_method :define, :define_with_fk
    end 
  end

  def define_with_fk
    ...
    define_without_fk(...)
    ...
  end

end

ActiveRecord::Schema.extend(ForeignKeyMigrations::Schema)

module Foo
  def self.extended(object)
    class << object
      alias_method :to_s_without_foo, :to_s unless method_defined?(:to_s_without_foo)
      alias_method :to_s, :to_s_with_foo
    end 
  end

  def to_s_with_foo
    "#{to_s_without_foo} - got foo!"
  end

end

class X
end

X.extend(Foo)
puts X.to_s