Dependency injection in controllers in Laravel - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to inject the service into the controller constructor.

Laravel

public function __construct([1] $service) {
    $this->service = $service;
}

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AController

BRequest

CUserService

DResponse

Attempts:

3 left

💡 Hint

Common Mistakes

Using framework classes like Request or Response instead of the service class.

Forgetting to type hint the service class in the constructor.

The constructor expects the service class to be injected. Here, UserService is the correct dependency.

2fill in blank

medium

Complete the method signature to inject the Request object.

Laravel

public function store([1] $request) {
    // method body
}

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AResponse

BRequest

CUserService

DController

Attempts:

3 left

💡 Hint

Common Mistakes

Injecting the service class instead of the Request.

Using Response or Controller as the parameter type.

The Request class is injected to access HTTP request data inside the method.

3fill in blank

hard

Fix the error in the controller method to correctly inject the service.

Laravel

public function show([1] $userService, $id) {
    return $userService->find($id);
}

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AUserService

BController

CResponse

DRequest

Attempts:

3 left

💡 Hint

Common Mistakes

Using Request or Response instead of the service class.

Not type hinting the service class.

The method expects the UserService to be injected so it can call the find method.

4fill in blank

hard

Fill both blanks to inject the service and call its method inside the controller.

Laravel

public function update([1] $service, $id) {
    return $service->[2]($id);
}

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AUserService

Bdelete

Cupdate

DRequest

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong method name like delete instead of update.

Injecting Request instead of the service.

The UserService is injected and its update method is called with the $id.

5fill in blank

hard

Fill all three blanks to inject the service, the request, and call the correct method.

Laravel

public function store([1] $service, [2] $request) {
    return $service->[3]($request->all());
}

Drag options to blanks, or click blank then click option'

AUserService

BRequest

Ccreate

DResponse

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the order of parameters.

Using Response instead of Request.

Calling the wrong method like update instead of create.

The UserService and Request are injected, and the create method is called with all request data.