So in Rails 4 the long desired feature to use not queries has been added.
Article.where.not(title: \'Rails 3\')
Has similar su
The most common alternative is already answer by @gregates
Recently there has been pull request in rails source
Add #any_of query method to active_record Which adds or functionality to activerecord
the contributor has already created a gem incase its not accepted
its rails 3.2 and 4 compatible
https://github.com/oelmekki/activerecord_any_of
I havent tried it yet but soon wish to use it looks good to me.