thanks for reading this post. How do you handle dependencies? A really
simple example: I've got a table called "entity" and another table,
let's say, "entity_type". The entity types can be changed, of course,
they also should be deletable, but only, if they are not used by some
entities! How can I ensure this in Rails or directly in the DBMS
(postgres)? Do I have to check it manually within a validate-method in
Thanks for any suggestions!