changing alias_method_chain to prepend

method_chain_to_prepend.rb

# A simplified explanation for moving alias_method_chain to prepend

# Sample class
class Note
  def show_id
    puts self.object_id
  end
end

# using alias_method_chain:
class Note
  def show_id_with_name
    print "#{self.class.name}: "
    show_id_without_name
  end
  
  alias_method_chain :show_id, :name
end

# when using alias_method_chain, it adds a new method :show_id_without_name which is actually the original :name method
# it essentially renames the :name method to :show_id_without_name
# afterwards, it redefines the :name method with the method :show_id_with_name
# it essentiall renames :show_id_with_name with :name
# so everytime you call :name, :show_id_with_name is actually executed
# when you call :show_id_without_name, the original :name method is executed


# using prepend

module Verbose
  def show_id
    print "#{self.class.name}: "
    super
  end
end

Note.prepend(Verbose)

# prepend adds the module to the ancestors tree, putting that method first so the methods of the module will take precedence
# that enables calling super which will execute the original :show_id method
# or rather executes the next :show_id in the method lookup chain