Be explicit of where the constraints are.
|@@ -891,7 +891,7 @@ which models can enforce data integrity. The +:dependent+ option on associations|
|allows models to automatically destroy child objects when the parent is|
|destroyed. Like anything which operates at the application level, these cannot|
|guarantee referential integrity and so some people augment them with foreign key|
|+constraints in the database.|
|Although Active Record does not provide any tools for working directly with such|
|features, the +execute+ method can be used to execute arbitrary SQL. You could|