Laravel Eloquent: eager loading of multiple nested relationships
Stefan Izdrail
Founder & Senior Architect · 2026-06-29
Title: Laravel Eloquent: Handling Multiple Nested Relationships with Eager Loading
Laravel is an increasingly popular PHP Framework that offers a rich set of tools for efficient and straightforward development. One of its key features is the use of relationships among objects. Through Laravel's Eloquent ORM, you can define relationships between models easily. However, when dealing with multiple nested relationships, things can become more complex and may require some adjustments to optimize performance.
Eager loading in Laravel refers to retrieving associated data along with the initial query for a model instance. This speeds up your application by reducing the number of queries executed, thereby improving scalability and efficiency. In the given example, you want to load authors' contacts and publishers for each book. To achieve this, you can use the `with()` method to eager-load multiple nested relationships.
In Laravel 5+, you can utilize the following code:
```php
use App\Book;
use App\Author;
use App\Contact;
use App\Publisher;
$books = Book::with(['author', 'author.contacts', 'author.publishers'])->get();
```
Let's break this down:
1. `Book::with([...])` refers to the books model and indicates that we need to eager-load relationships for each book.
2. The nested relationships are specified within each item of the array passed as a parameter to `with()`.
- 'author' will load the authors associated with each book.
- 'author.contacts' will fetch the contacts linked to each author.
- 'author.publishers' will retrieve the publishers related to each author.
3. Finally, the `->get()` method is used to execute the query and return all the found records as an array of book instances.
This approach ensures that data is loaded when needed instead of being retrieved lazily on demand. However, if you need to eager-load multiple relationships within a single relationship, you can leverage Eloquent's relationship methods:
```php
use App\Book;
use App\Author;
use App\Contact;
use App\Publisher;
$books = Book::with(['author.relationshipOne', 'author.relationshipTwo'])->get();
```
In this example, we add two nested relationships within the author relationship: `'author.relationshipOne'` and `'author.relationshipTwo'`. The result is an array of book instances that are eagerly loaded with authors, along with their relationship data.
While this approach may seem like a convenient solution at first glance, it can cause performance issues when used extensively or on large datasets. Eager-loading multiple nested relationships can lead to excessive memory consumption and slow execution times. It's essential to balance the need for optimal performance with convenience by considering your application's specific requirements.
In conclusion, Laravel provides powerful tools for handling complex nested relationships through its Eloquent ORM. By utilizing eager loading, you can improve your application's efficiency and scalability while optimizing query execution time. Nonetheless, ensure that the chosen approach is appropriate for your specific needs to avoid potential performance issues.