Avoid Silent Failures in Laravel Using preventLazyLoading()

The Hidden Problem: Lazy Loading

In Laravel applications, this looks harmless:

$users = User::all();
foreach ($users as $user) {
    echo $user->roles->count();
}

But behind the scenes:

👉 It runs N+1 queries

👉 One query for users + one per user for roles

This silently kills performance.

The Solution: preventLazyLoading()

Laravel gives you a way to detect this early.

Enable It

In AppServiceProvider:

use Illuminate\Database\Eloquent\Model;
public function boot()
{
    Model::preventLazyLoading(! app()->isProduction());
}

What Happens Now

If you accidentally do lazy loading:

$user->roles;

Laravel will:

• Throw an exception (or warning)
• Alert you during development

The Correct Way

Use eager loading:

$users = User::with('roles')->get();

Now:

• Only 2 queries
• No performance issue

Why This Is Powerful

It helps you:

• Catch performance bugs early
• Avoid hidden N+1 issues
• Improve query efficiency
• Build production-ready apps

When to Use It

Use it:

• In development environment
• While building APIs
• When optimizing queries

Avoid enabling it in production.