Add default UUID on create and save event

composer.json

@@ -1,6 +1,7 @@
 {
     "name": "kfoobar/laravel-uuid",
     "description": "Eloquent UUID trait for Laravel",
+    "type": "plugin",
     "license": "MIT",
     "authors": [
         {
@@ -9,13 +10,15 @@
         }
     ],
     "minimum-stability": "dev",
+    "prefer-stable": true,
     "require": {
-        "php": ">=7.3",
-        "illuminate/support": "^5.5|^6|^7|^8|^9"
+        "php": "^7.3|^8.0",
+        "illuminate/database": ">=5.5",
+        "illuminate/support": ">=5.5"
     },
     "autoload": {
         "psr-4": {
-            "KFoobar\\LaravelUuid\\": "src/KFoobar/LaravelUuid/"
+            "KFoobar\\Uuid\\": "src/"
         }
     }
 }

src/Traits/HasUuid.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace KFoobar\Uuid\Traits;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Support\Str;
+
+trait HasUuid
+{
+    /**
+     * Bootstrap the model and its traits.
+     *
+     * @return void
+     */
+    protected static function boot()
+    {
+        parent::boot();
+
+        static::creating(function (Model $model) {
+            $model->addDefaultUuid($model);
+        });
+
+        static::saving(function (Model $model) {
+            $model->addDefaultUuid($model);
+        });
+    }
+
+    protected function addDefaultUuid(Model $model)
+    {
+        if (empty($model->uuid)) {
+            $model->uuid = Str::uuid()->toString();
+        }
+    }
+}