Even the 'worst' of the ORMs (according to the people in these threads) makes this very easy:

  users = User.find_by_sql(<<~SQL)
    SELECT users.*,
           COUNT(posts.id) AS posts_count
    FROM users
    LEFT JOIN posts ON posts.user_id = users.id
    GROUP BY users.id
    HAVING COUNT(posts.id) > 10
  SQL

  users.first.posts_count
  # => 17