Simple Guide to Single Responsibility Principle in Laravel

Hey everyone! Today, we’re talking about something called the Single Responsibility Principle (SRP) and how to use it in Laravel. In simple words, SRP means that each part of your Laravel app should do one thing and do it well. This makes your app easier to handle and fix when needed.

• What is SRP in Laravel?

SRP is a smart way to organize your code. In Laravel, this means making sure things like Controllers and Models each have one job. For example, a Controller should only handle user requests, not also send emails or directly query the database.

• Avoiding Mistakes

Sometimes, we put too much into one part of our Laravel app. Like making a class that does too many things — handling user data, making decisions, and sending emails. That’s a no-no in SRP!

• Applying SRP with Examples

• • User Sign-Up

❌ Not the Best Way

A Controller does everything — checks user info, creates a user, and sends welcome emails.

class UserController extends Controller {


    public function store(Request $request) {

        $validatedData = $request->validate([
            'name' => 'required',
            'email' => 'required|email',
            'password' => 'required'
        ]);

        $user = User::create($validatedData);

        Mail::to($user->email)->send(new WelcomeEmail($user));

        return redirect()->route('users.index');
    }


}

✅ A Better Way

Break it down. One class checks the user info, another handles user creation, and a third sends emails.

class UserController extends Controller {

    protected $userService;

    public function __construct(UserService $userService) {

        $this->userService = $userService;

    }

    public function store(StoreUserRequest $request) {

        $user = $this->userService->createUser($request->validated());

        $this->userService->sendWelcomeEmail($user);

        return redirect()->route('users.index');
    }

}

class UserService {

    public function createUser(array $data) {

        return User::create($data);

    }

    public function sendWelcomeEmail(User $user) {

        Mail::to($user->email)->send(new WelcomeEmail($user));

    }
}

class StoreUserRequest extends FormRequest {

    public function rules() {
        return [
            'name' => 'required',
            'email' => 'required|email',
            'password' => 'required'
        ];
    }

}

• • Making Reports

❌ Not the Best Way

A Controller that gets data, processes it, and makes a report.

class ReportController extends Controller {

    public function downloadReport() {

        $data = Report::getReportData();
        $report = ReportGenerator::generate($data);

        return response()->download($report);

    }

}

✅ A Better Way

Use a service to prepare the report. Keep the Controller simple.

class ReportController extends Controller {

    protected $reportService;

    public function __construct(ReportService $reportService) {

        $this->reportService = $reportService;

    }

    public function downloadReport() {

        $report = $this->reportService->prepareReport();
        return response()->download($report);

    }

}

class ReportService {

    public function prepareReport() {

        $data = Report::getReportData();
        return ReportGenerator::generate($data);

    }

}

• Why SRP is Great

Using SRP makes your code cleaner and your life easier. When each part of your app has just one job, it’s easier to fix bugs and add new features.

Conclusion

So, that’s the Single Responsibility Principle in a nutshell! By making sure each part of your Laravel app does just one thing, you’ll have a much easier time managing your code. Give it a try in your next project and feel free to share how it goes in the comments!