Check if record does NOT exist in Rails (from array of ids)?

Question

I can do this to check if a record(s) exists (say id "1" exists, but "2" and "3" don't):

Model.exists?(:id => [1, 2, 3]) #=> true 

How do I do the opposite, so:

Model.not_exists?(:id => [1, 2, 3]) #=> true 

Answer 1

just add a ! operator

!Model.exists?(:id => [1, 2, 3]) #=> true 

Answer 2

If you only need search records through ID you can try this

class Model   def self.not_exists?(ids)     self.find(ids)     false   rescue     true   end end 

If any of the IDs does not exist the find method will raise a ActiveRecord::RecordNotFound exception that we simply catch and return true.

Excuse my English :)