This is a total noob question, but how do you prevent a record from
being destroyed if it has any related records. In my case, I have a
book model and a page model. A book has_many pages.
How do I prevent book.destroy from destroying a book if it has
associated page records? Is there a :dependent option that would do
this? Do I need to do some sort of before destroy callback?
This is a total noob question, but how do you prevent a record from
being destroyed if it has any related records.
The database layer can do this easily, so harness its power! Put a
foreign key constraint in your DB with ON DELETE RESTRICT. The Railsy
way to do this is with the excellent foreign_key_migrations plugin (see harukizaemon (Simon Harris) · GitHub ) – which you should probably be using
in any case. It works with mySQL and PostgreSQL; I’m not sure about
other database systems.