baoshi-was/app/DemandProcess.php

<?php

namespace App;

use App\Traits\ModelLogChanging;
use App\Traits\ModelTimeFormat;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class DemandProcess extends Model
{
    use ModelLogChanging;
    use ModelTimeFormat;

    protected $fillable = ['demand_id', 'processor', 'explain'];

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

    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class, 'processor', 'id');
    }

}