Hi All, I've just started learning Ruby on Rails. It's an amazing framework! I have some Active Record questions. Any help would be greatly appreciated by this RoR n00b! Active Record has many operations such as :counter_cache that require multiple database queries. In the :counter_cache example, Active Record needs to both create/delete a record in the child table and then increment/decrement the counter cache in the parent table. Does Active Record execute these multiple queries within a single database transaction? If not, how do you ensure that both queries are completed? If Active Record executes the queries within a transaction, then what level of locking does Active Record use? Also, how do you prevent deadlock?
on 2007-04-14 20:37