construprogress/app/Models/Phase.php

<?php

namespace App\Models;

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

class Phase extends Model
{
    use SoftDeletes;

    protected $fillable = [
        'project_id', 'name', 'description', 'order', 'color', 'progress_percent',
        'planned_start', 'planned_end', 'actual_start', 'actual_end',
    ];

    protected $casts = [
        'planned_start' => 'date',
        'planned_end' => 'date',
        'actual_start' => 'date',
        'actual_end' => 'date',
    ];

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

    public function layers()
    {
        return $this->hasMany(Layer::class);
    }

    public function progressUpdates()
    {
        return $this->hasMany(ProgressUpdate::class);
    }

    public function currentLayer()
    {
        return $this->hasOne(Layer::class)->latestOfMany();
    }

    public function features()
    {
        return $this->hasManyThrough(Feature::class, Layer::class);
    }

    public function media()
    {
        return $this->morphMany(Media::class, 'mediable');
    }

    public function images()
    {
        return $this->morphMany(Media::class, 'mediable')->where('category', 'image');
    }

    public function tasks()
    {
        return $this->hasMany(Task::class);
    }

    public function getDeviationDaysAttribute(): ?int
    {
        if (! $this->planned_end) {
            return null;
        }
        $end = $this->actual_end ?? now();

        return $this->planned_end->diffInDays($end, false);
    }
}