Upgrade a method in place

version.rb

class Foo
  # Define the original render method
  def render
    puts "Foo#render"
  end
end

module Overrides
  def self.prepended(klass)
    klass.alias_method :base_render, :render
    klass.include RenderMethods
    klass.extend ClassMethods
  end

  module RenderMethods
    # Define alternative versions of the render method
    def render_1
      base_render
      puts "Version1#render"
    end

    def render_2
      base_render
      puts "Version2#render"
    end
  end

  module ClassMethods
    # Class method to switch render method implementations
    def version=(version)
      case version
      when 1
        # Alias render to render_1
        self.alias_method :render, :render_1
      when 2
        # Alias render to render_2
        self.alias_method :render, :render_2
      else
        raise ArgumentError, "Unknown render method version: #{version}"
      end
    end
  end
end

class Foo
  prepend Overrides
end

# Usage
foo = Foo.new
foo.render

puts "\nSwitching to Version 1"
Foo.version = 1
foo.render

puts "\nSwitching to Version 2"
Foo.version = 2
foo.render

puts "\nSwitching back to original"
Foo.version = 1
foo.render