cssd-back/app/Transfer.php

<?php

namespace App;

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

class Transfer extends Model
{
    use SoftDeletes;

    public $fillable = [ 'user_id' , 'to_date' , 'from_date' , 'status' , 'user_transfer_id' ];

    public function user()
    {
        return $this->belongsTo( 'App\User' );
    }

    public function userTransfer()
    {
        return $this->belongsTo( 'App\User', 'user_transfer_id' );
    }

    public function transferable()
    {
        return $this->morphTo();
    }
}