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Edit File: StoreRequest.php

<?php

namespace App\Http\Requests\Admin\coupons;

use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;

class StoreRequest extends FormRequest
{
    const VALIDATION_RULES = 'required|numeric';
    public function authorize()
    {
        return true;
    }

public function rules()
    {
        return [
            'coupon_num'            => 'required|unique:coupons,coupon_num',
            'max_use'               => self::VALIDATION_RULES . '|min:1|max:1000000',
            'discount' => [
                'required',
                'numeric',
                'min:1',
                Rule::when($this->type == 'ratio', 'max:100'),
                Rule::when($this->type == 'number', 'max:1000000'),
            ],
            'max_discount' => [
                'required_if:type,ratio',
                Rule::when($this->type == 'ratio', 'numeric|min:1|max:1000000'),
            ],
            'start_date'            => 'required|after_or_equal:' . \Carbon\Carbon::now()->format('m/d/Y'),
            'expire_date'           => 'required|after:start_date',
            'type'                  => 'required|in:ratio,number',
        ];
    }

public function prepareForValidation()
    {
        $this->merge([
            'expire_date' => date('Y-m-d H:i:s', strtotime($this->expire_date)),
            'start_date' => date('Y-m-d H:i:s', strtotime($this->start_date)),
        ]);
    }

public function messages()
    {
        return [
            'coupon_num.unique' => __('admin.coupon_number_used_before'),
        ];
    }
}

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