When data changes, you must remove old cache so fresh data is loaded.

🔹 Example: Clearing cache manually

Update user:

$user = User::find(1);
$user->name = "New Name";
$user->save();

// clear cache
Cache::forget("user_1");

$user = User::find(1);
$user->name = "New Name";
$user->save();

// clear cache
Cache::forget("user_1");

Delete user:

$user = User::find(1);
$user->delete();

// clear cache
Cache::forget("user_1");

$user = User::find(1);
$user->delete();

// clear cache
Cache::forget("user_1");

🔁 What happens after clearing cache?

1. Cache is removed
2. Next request hits database
3. Fresh data is stored again

🧠 Cache Key Importance

To make this work properly, always use structured keys:

user_{$id}
user_{$id}_profile

user_{$id}
user_{$id}_profile

👉 This helps you delete only what is needed.

⚙️ What is booted() in Laravel?

The booted() method is used inside a Laravel Model to automatically run code when something happens to the model.

👉 It is often used for automatic cache clearing.

🔹 Example: Auto cache delete using booted()

Instead of manually writing Cache::forget() everywhere, you can centralize it in the model.

use Illuminate\Support\Facades\Cache;

class User extends Model
{
    protected static function booted()
    {
        static::updated(function ($user) {
            Cache::forget("user_{$user->id}");
        });

        static::deleted(function ($user) {
            Cache::forget("user_{$user->id}");
        });
    }
}

use Illuminate\Support\Facades\Cache;

class User extends Model
{
    protected static function booted()
    {
        static::updated(function ($user) {
            Cache::forget("user_{$user->id}");
        });

        static::deleted(function ($user) {
            Cache::forget("user_{$user->id}");
        });
    }
}

🔥 What happens here?

When user updates:

• Laravel automatically runs this code
• Old cache is deleted

When user deletes:

• Cache is also removed automatically

🧠 Why booted() is useful

Without booted() ❌

• You must manually clear cache everywhere
• Easy to forget → causes stale data

With booted() ✅

• Cache logic is centralized
• Automatically executed
• Cleaner and safer code

⚠️ Important Note

• Keep booted() logic simple
• For large applications, Laravel Observers are preferred

🏁 Final Summary

• Don’t cache frequently changing or critical data
• Always clear cache when data is updated or deleted
• Use Cache::forget() for manual clearing
• Use booted() for automatic cache management

🚀 Final Thought

Caching is powerful, but only when used smartly. The goal is not to cache everything—but to cache the right things in the right way.