I have a one-to-many relation between two tables, ‘users’ and ‘posts’,
where User has_many :posts and Post belongs_to :user. I have a query
which returns every user on the table, along with the content of their
latest post, if any, as follows:
@users = User.find_by_sql <<-EOQ SELECT u.name, p1.content FROM users u LEFT JOIN posts p1 ON (u.id = p1.user_id) LEFT OUTER JOIN posts p2 ON (u.id = p2.user_id AND (p1.created_at < p2.created_at OR p1.created_at = p2.created_at AND p1.id < p2.id)) WHERE p2.id IS NULL EOQ
Is there a way to make this more idiomatic by using Active Record’s
query interface? I’m using Rails 3.