# UUIDs

We have a branch called `recipes/uuid` that converts all "ids" to use the UUID6 type. We chose UUID6 as it allows for ordering due to its sequential nature. 

### How to use

**Note:** this has been rebased on the latest `main` branch and might not work properly on v1.3.0 and below. However, you should be able to work out how to apply it based on the diffs.

#### New projects

You can either check out the branch and work off that or follow the [cherry-pick instructions](https://docs.petal.build/petal-pro-documentation/v1.4.0/recipes/how-to-apply-a-recipe-with-git-cherry-pick) with the branch `recipes/npm`.

```
git clone https://github.com/petalframework/petal_pro.git
cd petal_pro
git checkout recipes/uuid
```

Once applied, you might need to run `mix ecto.reset` if you had already migrated the database previously.

#### Existing projects

If you already have a project in production then it will be a bit more difficult to update to use UUIDs. [This blog post](https://pawelurbanek.com/elixir-phoenix-uuid) has an example of a migration.