[7.x] Add getFirstWhereStartsWith() to ComponentAttributeBag

[iAmKevinMcKee]

Following up on the changes from earlier today, in order to effectively use this with Livewire we need to be able to get the first attribute value that starts with 'wire:model' so we can use that value for the error bag, among other reasons.

This function gives you the ability to do that. Your component would look like this:

Usage

<x-text-input wire:model.lazy="name" />

Blade Component

<div>
    <input type="text" {{$attributes->whereStartsWith('wire:model')}} />
    @error($attributes->getFirstWhereStartsWith('wire:model'))
        {{$message}}
    @enderror
</div>

[taylorotwell]

This returns the value and not the attribute key, correct?

[iAmKevinMcKee]

Correct, in this example of <x-text-input wire:model.lazy="name" />, then $attributes->getFirstWhereStartsWith('wire:model') would return "name"

[taylorotwell]

I just renamed the method to first so you can do {{ $attributes->thatStartWith('wire:model')->first() }}