construprogress/app/Models/IssueTask.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;

class IssueTask extends Model
{
    use SoftDeletes;

    protected $fillable = [
        'issue_id', 'title', 'is_done', 'done_at', 'done_by',
        'assigned_to', 'due_date', 'order',
        'uuid', 'client_updated_at',
    ];

    protected $casts = [
        'is_done'  => 'boolean',
        'done_at'  => 'datetime',
        'due_date' => 'date',
    ];

    public function issue()     { return $this->belongsTo(Issue::class); }
    public function assignee()  { return $this->belongsTo(User::class, 'assigned_to'); }
    public function completer() { return $this->belongsTo(User::class, 'done_by'); }
    public function media()     { return $this->morphMany(Media::class, 'mediable'); }

    /** Overdue = has a due date in the past and not yet done. */
    public function getIsOverdueAttribute(): bool
    {
        return ! $this->is_done && $this->due_date && $this->due_date->isPast();
    }
}