gistfile1.rb

def has_role?(role)    
	# if list isn't already assigned to something, create an array of the names of my roles
	list ||= self.roles.map(&:name)    
	# if list includes the string representation of the passed-in role [assumed to be the name] or if the list includes the string 'admin' [assumed to be the administrative role] return true
	list.include?(role.to_s) || list.include?('admin')  
end