find() with nil when there are no records

In my current rails program when I use something like

 user = User.find(10)

When there is no user with ID=10 , I will have exception like :

ActiveRecord::RecordNotFound: Couldn't find User with ID=10

Can I get nil instead of raising exception so when I do something like :

unless user = Challenge.find(10)
  puts "some error msg"         
end

I just want to get nil when there is no records and I don't want to use begin/rescue

Thanks