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Edit File: AddCartRequest.php

<?php

namespace App\Http\Requests\Api\Cart;

use App\Models\ProductAdditiveCategory;
use Illuminate\Foundation\Http\FormRequest;
use App\Models\Cart;
use App\Models\ProductGroup;
use App\Models\ProductAdditive;
use Illuminate\Contracts\Validation\Validator;
use Illuminate\Http\Exceptions\HttpResponseException;
use App\Traits\ApiTrait;
class AddCartRequest extends FormRequest
{
    use ApiTrait;
    public function rules()
    {
        return [
            'group_id'  => 'required|exists:product_groups,id',
            'store_id'  => 'required|exists:stores,id',
            'product_id'=> 'nullable',
            'qty'       => 'required|numeric',
            'additives' => 'nullable',
        ];
    }

public function prepareForValidation(){
        $group = ProductGroup::find($this->group_id);
           if ($group){
               $this->merge(['product_id' => $group->product_id]);
           }
           if ($cart = Cart::where('user_id' , auth('api')->id())->where('group_id' , $this->group_id)->where('additives' , $this->additives)->first()){
               $this->merge(['qty' => $cart->qty + $this->qty]);

}
    }
    public function withValidator($validator){
        $validator->after(function ($validator) {
            if($this->additives && $additives = json_decode($this->additives)){
               foreach ($additives as $additive) {
                 $get_additive = ProductAdditiveCategory::find($additive);
                 if(!$get_additive){
                     $validator->errors()->add('additives', __('stores_dashboard.additive_not_available'));
                 }
                }
            }
        });
    }

public function failedValidation(Validator $validator)
    {
        throw new HttpResponseException($this->requestFailsReturn($validator));
    }
}

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