snipe-it/app/Models/SnipeModel.php

<?php

namespace App\Models;

use App\Helpers\Helper;
use Illuminate\Database\Eloquent\Model;

class SnipeModel extends Model
{
    // Setters that are appropriate across multiple models.
    public function setPurchaseDateAttribute($value)
    {
        if ($value == '') {
            $value = null;
        }
        $this->attributes['purchase_date'] = $value;
    }

    /**
     * @param $value
     */
    public function setPurchaseCostAttribute($value)
    {
        $value =  Helper::ParseFloat($value);
        if ($value == '0.0') {
            $value = null;
        }
        $this->attributes['purchase_cost'] = $value;
    }

    public function setLocationIdAttribute($value)
    {
        if ($value == '') {
            $value = null;
        }
        $this->attributes['location_id'] = $value;
    }

    public function setCategoryIdAttribute($value)
    {
        if ($value == '') {
            $value = null;
        }
        $this->attributes['category_id'] = $value;
    }

    public function setSupplierIdAttribute($value)
    {
        if ($value == '') {
            $value = null;
        }
        $this->attributes['supplier_id'] = $value;
    }

    public function setDepreciationIdAttribute($value)
    {
        if ($value == '') {
            $value = null;
        }
        $this->attributes['depreciation_id'] = $value;
    }

    public function setManufacturerIdAttribute($value)
    {
        if ($value == '') {
            $value = null;
        }
        $this->attributes['manufacturer_id'] = $value;
    }

    //
    public function getDisplayNameAttribute()
    {
        return $this->name;
    }
}