Add all files

app/Observers/CategoryObserver.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Observers;
+
+use App\Models\Category;
+
+class CategoryObserver
+{
+    /**
+     * Handle the Category "creating" event.
+     *
+     * @return void
+     */
+    public function creating(Category $category)
+    {
+        $parent = $category->parent;
+        $full_slug = $category->slug;
+        // Set full_slug
+        while ($parent) {
+            $fullSlug = $parent->slug;
+            $full_slug = $fullSlug . '/' . $full_slug;
+            $parent = $parent->parent;
+        }
+
+        $category->full_slug = $full_slug;
+    }
+
+    /**
+     * Handle the Category "updating" event.
+     *
+     * @return void
+     */
+    public function updating(Category $category)
+    {
+        // Did parent or slug change?
+        if ($category->isDirty('parent_id') || $category->isDirty('slug')) {
+            $parent = $category->parent;
+            $full_slug = $category->slug;
+            // Set full_slug
+            while ($parent) {
+                $fullSlug = $parent->slug;
+                $full_slug = $fullSlug . '/' . $full_slug;
+                $parent = $parent->parent;
+            }
+
+            $category->full_slug = $full_slug;
+
+            // Update children
+            $category->children->each(function ($child) use ($category) {
+                $child->update([
+                    'full_slug' => $category->full_slug . '/' . $child->slug,
+                ]);
+            });
+        }
+    }
+}