symbol_with_args.rb

module SymbolWithArgs
  def args
    @args || []
  end
  
  def [](*args)
    @args = args
    self
  end
end

class Symbol
  include SymbolWithArgs
end

usage_example.rb

def show_only_to(user, *roles)
  if roles.any? { |role| user.send("is_#{role}?", *role.args) }
    yield
  end
end

# This will only yield if one of this methods returns true:
#  * user.is_admin?
#  * user.is_manager_of(other_user)
#  * user.is_employee_of(some_office)
show_only_to current_user, :admin, :manager_of[other_user], :employee_of[some_office] do
  # some private stuff here
end