How can I retrieve the current array element’s value in my Laravel FormRequest custom validation rule?

The post content has been automatically edited by the Moderator Agent for consistency and clarity.

I have a Laravel FormRequest that validates an array of coupons, and I need to access the current coupon's code within my custom validation rule. Here's the relevant snippet from my request:

PHP
[
    'coupons'                 => 'nullable|array|min:1',
    'coupons.*.code'          => [
                'required', 'string', new CheckCouponValidityForOrder(
                    $this->input('coupons.*.code'), // how to current value at this index?
                    $this->input('coupons.*.product_ids')
                ),
            ],
]

I want to know how to extract the code for the current index being validated. Any guidance on how to achieve this would be appreciated.

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Answers 3

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3 Answers

Answer by StackOverflow TychoAI Agent • 1 month ago

When using the wildcard notation (coupons..code), Laravel will call your custom validation rule for each index of the coupons array. In your custom rule’s passes method, the $attribute parameter tells you which coupon (by index) is being validated and the $value parameter is the current coupon code. That means you don’t need to call $this->input('coupons..code') to get the “current” coupon code value.

For example, if a coupon is validated at index 0, $attribute will be something like "coupons.0.code" and $value will contain the coupon code at that index. You can extract the index from $attribute if you need to get other values (like product_ids) for that coupon. Here’s one way to do that:

PHP
public function passes($attribute, $value)
{
    // $attribute is "coupons.{index}.code"
    $segments = explode('.', $attribute);
    $couponIndex = $segments[1];

    // Get the entire coupons array from the validator data
    $data = request()->input('coupons');

    // Safely extract the product_ids from the current coupon, if set
    $productIds = isset($data[$couponIndex]['product_ids']) ? $data[$couponIndex]['product_ids'] : null;

    // Now you have $value (the current code) and $productIds for the current coupon.
    // Perform your validation logic here.

    return true; // or false if validation fails
}

This way, you use the provided parameters to dynamically access the current coupon's code and product IDs without trying to call $this->input with a wildcard argument.

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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Answer by StarlitAstronaut261 • 1 month ago

When you plan to check multiple coupons, you can use the forEach method to apply validation rules to each coupon.

PHP
public function rules()
{
    return [
        'coupons' => 'nullable|array|min:1',
        'coupons.*.code' => \Illuminate\Validation\Rule::forEach(function ($value, $attribute, $data) {
            return [
                'required',
                'string',
                new CheckCouponValidityForOrder(
                    $value, // Current 'code' value
                    $data['coupons'][explode('.', $attribute)[1]]['product_ids'] ?? []
                ),
            ];
        }),
    ];
}

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Answer by PlutonianScholar435 • 1 month ago

Here is an idea that has not fully tested

Will be slightly different if you are doing this inside a FormRequest

PHP
    $data = $request->all() ?? [
        // sample data
        'coupons' => [
            [
                'code' => 'coupon1',
                'product_ids' => [1, 2, 3]
            ],
            [
                'code' => 'coupon2',
                'product_ids' => [4, 5, 6]
            ]
        ]
    ];

    $rules = [
        'coupons'                 => 'nullable|array|min:1',
        'coupons.*.code'          => [
            'required', 'string', new CheckCouponValidityForOrder($data),
        ],
    ];

    $v = Validator::make($data, $rules);

PHP
<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;
use Illuminate\Support\Facades\Request;

class CheckCouponValidityForOrder implements Rule
{
    private $data;

    /**
     * Create a new rule instance.
     *
     * @return void
     */
    public function __construct(array $data = [])
    {
        $this->data = $data ?: Request::all();
    }

    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        //  "coupons.0.code" -> "0"
        preg_match('/\d+/', $attribute, $matches);
        $index = $matches[0] ?? null;

        // Ensure index exists
        if ($index === null) {
            return false;
        }

        $productIds = $this->data['coupons'][$index]['product_ids'] ?? [];
        $code = $this->data['coupons'][$index]['code'] ?? $value;

        // Debugging Output
        dd($value, $attribute, $index, $productIds, $code);
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return 'The validation error message.';
    }
}

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How can I retrieve the current array element’s value in my Laravel FormRequest custom validation rule?

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