User.php

<?php

namespace App\Models;

use Laravel\Sanctum\HasApiTokens;
use Database\Factories\UserFactory;
use Illuminate\Contracts\Auth\CanResetPassword;
use Illuminate\Notifications\Notifiable;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Database\Eloquent\Factories\HasFactory;

class User extends Authenticatable implements CanResetPassword
{
    use HasApiTokens;
    use Notifiable;
    use HasFactory;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name',
        'email',
        'type',
        'password',
        'is_admin'
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password',
        'remember_token',
    ];

    protected $casts = [
        'is_admin' => 'boolean',
    ];

    protected static function newFactory(): UserFactory
    {
        return UserFactory::new();
    }

    /**
     * @return HasMany
     */
    public function articles(): HasMany
    {
        return $this->hasMany(Article::class);
    }

    public function enrollments(): HasMany
    {
        return $this->hasMany(Enrollment::class);
    }

    public function lessons()
    {
        // User has Many enrollments and each enrollment has many lessons.
        return $this->hasManyThrough(Lesson::class, Enrollment::class, 'student_id', 'enrollment_id');
    }
}