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Laravel – Dependency Injection is not working on any of my Livewire 3 components

I’m facing a very weird issue. Dependency injection is not working, and I don’t have any clue why it isn’t. Here’s my component:

<?php

namespace AppLivewireForms;

use AppEnumsCourseType;
use AppRepositoriesInterfacesICourseRepository;
use BenSampoEnumRulesEnumValue;
use Exception;
use IlluminateSupportFacadesLog;
use IlluminateValidationRule;
use LivewireComponent;

class Course extends Component
{
    private ICourseRepository $_courses;
    public $heading;
    public $categories;

    ....

    public function mount(ICourseRepository $courses, $heading = 'Add Course')
    {
        $this->_courses = $courses;
        $this->heading = $heading;
    }

    ...
    public function create()
    {
        $this->reset(); // Reset all fields
        $this->categories = $this->_courses->allCategories(); // Fetch all categories
        $this->dispatch('openCourseModal', ['title' => 'কোর্স যোগ করুন']); // Dispatch an event to open the modal
    }
    ...

    public function render()
    {
        return view('livewire.forms.course');
    }
}

Here, the click method is bound to the wire:click event. The exception I’m encountering is:

Error
PHP 8.3.4
10.48.20
Typed property AppLivewireFormsCourse::$_courses must not be accessed before initialization

Can you please help me get through this? Thank you for your attention.

Tags:

2

Answers


  1. 0

    If you look carefully at the error message you will get the reason behind this error:

    Typed property AppLivewireFormsCourse::$_courses must not be accessed before initialization.

    Which means you need to initialize $_courses on the class constructor.

    You can simply make the $_courses property nullable to prevent initialization errors:

    protected ?ICourseRepository $_courses = null;

    So the initial value is null but later in the mount method it will get resolved using DI.

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  2. 0

    The issue could be that your component is called many times in the application, but as specified in the livewire lifecycle hooks documentation, the mount() method is executed only once when the component is created, so when other actions are performed in the application, the service will no longer be injected, as mount() will not be executed until the next page reload.

    If you need to use the ICourseRepository many times during the lifecycle of your Course component then you should inject it via the boot() method that is called at the beginning of every request.

    Here’s an exemple :

    public function boot(ICourseRepository $courses, $heading = 'Add Course')
{
    $this->_courses = $courses;
    $this->heading = $heading;
}

    I hope this will help

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