SQLite3 “forgets” to use foreign keys

Question

I\'m using Ruby with SQLite3 and my attempts to use foreign keys in Sqlite3 were unfortunately not successful. According to sqlite3 --version, version 3.7.13 is

Answer 1

I think I can answer my own question: The documentation says: Foreign key constraints are disabled by default (for backwards compatibility), so must be enabled for each database connection separately. Annoying, but it's finally working now.