Rails: Find rows without connection in HABTM relation

Question

I have two models, Users and Leads connected with HABTM relation:

class Lead < ActiveRecord::Base
  has_and_belongs_to_many :use         


        

Answer 1

Kerozu, if you want to display leads that have not been bought by current user only, you can use raw sql like this

    sql = <<-SQL
      SELECT *
      FROM leads
      WHERE id NOT IN (
        SELECT lead_id
        FROM leads_users
        WHERE user_id = ?
      )
    SQL

    Lead.find_by_sql [sql, id]