Laravel Architecture Deep Dive: Repositories, Services, Presenters, Transformers

After watching a video on Laravel architecture, the author reflects on the importance of clear layer separation to achieve single responsibility and better maintainability in a Laravel project.

Laravel Simple Architecture

In a simple project, database queries, business logic, and data passed to the view are often placed directly in the controller, leading to bloated and hard‑to‑maintain code as the project grows. Similarly, stuffing all CRUD operations into the model can make it chaotic and cause unnecessary queries.

Repository (Data Warehouse)

Operations related to Eloquent/DB, such as CRUD, are extracted into a Repository, which acts like a warehouse managing data retrieval from models before it is handed to other layers.

Service (Business Logic Layer)

Business logic that goes beyond simple data queries—such as checking membership status or setting permissions—should reside in a Service layer, which the controller calls to keep responsibilities distinct.

Presenter (Reusable Presentation Logic)

Fixed, reusable presentation tasks—such as converting timestamps to Y-m-d H:i:s format—can be extracted into a Presenter, which is then injected into the view, keeping templates clean.

Transformer (Data Shaping)

When a repository returns full records (e.g., $this->user->all();) but only certain fields are needed, a Transformer filters the data after retrieval, avoiding conflicts between different parts of the code that require different field sets.

$this->user->all();

$this->user->all(['name','email']);

The Transformer processes the result of $this->user->all(), selecting only the required fields before returning them.

Additional fields can be added or modified in the Transformer using helper functions such as array_set().

Formatter (Consistent API Response)

The Formatter ensures that API responses maintain a uniform structure, similar to the role of a Transformer but focused on output formatting.

In summary, applying these layers—Repository, Service, Presenter, Transformer, and Formatter—helps keep Laravel applications modular, maintainable, and scalable, though practical implementation may still present challenges that require further study.