How to return an empty ActiveRecord relation?

Question

If I have a scope with a lambda and it takes an argument, depending on the value of the argument, I might know that there will not be any matches, but I still want to return

Answer 1

scope :none, limit(0)

Is a dangerous solution because your scope might be chained upon.

User.none.first

will return the first user. It's safer to use

scope :none, where('1 = 0')