Rails SQL query builder… Or ActiveRecord query builder

Question

I need to run sql query like

sql = \'SELECT * FROM users WHERE id != \' + self.id.to_s + \' AND id NOT IN (SELECT artner_id FROM encounters WHERE user_id =          


        

Answer 1

There's a ruby library that utilizes relational algebra. It is called ARel. If you are using Rails 3.x, then you already have.

ids   = Partner.where(user_id: self.id).pluck(:partner_id) << self.id
users = User.where("id NOT IN #{ ids.join(',') }")