Trouble with generating UUIDs for ActiveRecord models in Rails 7.1 - unexpected nil values
I'm trying to implement I'm having a hard time understanding I'm trying to implement UUIDs as primary keys for my ActiveRecord models in a Rails 7.1 application... I've followed the documentation to set up UUIDs, but I'm working with a question where some of the records are being saved with nil values for the UUID column. Here's how I've set it up: In my migration file, I have: ```ruby class CreateUsers < ActiveRecord::Migration[7.1] def change create_table :users, id: :uuid do |t| t.string :name t.timestamps end end end ``` I've also updated the model to use `default: -> { "gen_random_uuid()" }` for the UUID field. However, when I run the following code to create users: ```ruby User.create(name: 'Alice') User.create(name: 'Bob') ``` I sometimes find that some entries in the database have a NULL UUID value, which shouldn't happen. I've checked my database settings, and I'm using PostgreSQL 15 with the `pgcrypto` extension enabled. The extension is supposed to allow me to use `gen_random_uuid()`, and I confirmed that it's working by running a direct query in the database: ```sql SELECT gen_random_uuid(); ``` This returns a valid UUID. I've tried manually creating records with `User.create!(name: 'Charlie', id: SecureRandom.uuid)` to bypass the default UUID generation, and that works fine. I also ensured that the UUID column is set to `NOT NULL`. Could there be any race conditions or issues with how ActiveRecord is handling the UUID generation during multiple simultaneous creates? Any insights or solutions would be greatly appreciated! What am I doing wrong? I'm working on a application that needs to handle this. Has anyone else encountered this? This is happening in both development and production on Linux. What would be the recommended way to handle this? I've been using Ruby for about a year now. What's the best practice here?