todo/app/Models/Task.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\Relations\HasMany;

class Task extends Model
{
    use HasFactory;

    protected $fillable = [
        'id',
        'name',
        'description',
        'parent_id',
        'project_id',
        'status_id',
        'created_by_id',
    ];

    public function creator(): BelongsTo
    {
        return $this->belongsTo(User::class, 'created_by_id');
    }

    public function assigned(): BelongsToMany
    {
        return $this->belongsToMany(User::class);
    }

    public function status(): BelongsTo
    {
        return $this->belongsTo(TaskStatus::class);
    }

    public function labels(): BelongsToMany
    {
        return $this->belongsToMany(Label::class);
    }

    public function notes(): HasMany
    {
        return $this->hasMany('App\Models\Note', 'task_id');
    }

    public function subTasks(): HasMany
    {
        return $this->hasMany('App\Models\Task', 'parent_id');
    }

    public function project(): BelongsTo
    {
        return $this->belongsTo(Project::class);
    }

    public function files(): HasMany
    {
        return $this->hasMany('App\Models\File', 'task_id');
    }
}