Question

I got a Singleton Class like

module Database
  class Table
    include Singleton
    # ...
  end
end

And in this Class I’m using in a method the define_method-method and get:

/home/jrn/Development/RocketRuby/lib/modules/database.rb:184:in `block in register_methods': undefined method `define_method' for #<Accounting::UsersTable:0x00000001f103c8> (NoMethodError)

(As you can see, the Class Table has been inherited by a Class called UsersTable in the Module Accounting)

What might gone wrong? What are typical mistakes when working with define_methods and Singleton?

Yours, Joern

Answer 1

Have you tried something like this?

class Table
  include Singleton

  def register_methods
    self.class.send(:define_method, :hello) { puts "Hello!" }
  end


  # or ...

  def register_methods
    define_singleton_method(:hello) { puts "Hello!" }
  end