Foreign keys in Rails 3

Question

I understand that according to Rails philosophy, data integrity checks should be done at the application level as opposed to the database level. Like many other developers, I en

Answer 1

http://guides.rubyonrails.org/migrations.html#active-record-and-referential-integrity

"Although Active Record does not provide any tools for working directly with such features, the execute method can be used to execute arbitrary SQL. There are also a number of plugins such as foreign_key_migrations which add foreign key support to Active Record."