You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ability.rb
    path of file: ./repos/hyrax/.koppie/app/models
    
    the code of the file until where you have to start completion: class Ability
  include Hydra::Ability

  include Hyrax::Ability
  self.ability_logic += [:everyone_can_create_curation_concerns]

  # Define any customized permiss
    
  def custom_permissions
    # Limits deleting objects to a the admin user
    #
    # if current_user.admin?
    #   can [:destroy], ActiveFedora::Base
    # end

    # Limits creating new objects to a specific group
    #
    # if user_groups.include? 'special_group'
    #   can [:create], ActiveFedora::Base
    # end
  end