database-integrity – Row Coding

Rails 3: Validate combined values

September 23, 2023 by Tarik

Bear with me. The way the validates method in ActiveModel works is to look for a Validator. :presence => true looks for PresenceValidator and passes the options: true to the validator’s initializer. I think you want validates :husband, :presence => true, :uniqueness => {:scope => :wife} (The uniqueness validator is actually part of ActiveRecord, not … Read more

IntegrityError duplicate key value violates unique constraint – django/postgres

February 7, 2023 by Tarik

This happend to me – it turns out you need to resync your primary key fields in Postgres. The key is the SQL statement: SELECT setval(‘tablename_id_seq’, (SELECT MAX(id) FROM tablename)+1);