CraftCMS form to update single via Front-End User login

index.twig

{% extends "layouts/default" %}

{% block main %}

	<div class="container">
		<div class="content">
			<h1>Status page</h1>

			{% for type, message in craft.app.session.getAllFlashes() %}
					{{ tag('div', {
						class: [
							'flash-message',
							'flash-message--' ~ type
						],
						role: 'alert',
						aria: {
							live: 'assertive',
							atomic: 'true'
						},
						text: message
					})}}
			{% endfor %}


			<form class="form" method="post" accept-charset="UTF-8">

				<fieldset>
					<legend class="h6 visually-hidden">Seaside Resort Status Update</legend>

					{{ csrfInput() }}

					{{ actionInput('lifeguard/lifeguard/update') }}


					<div class="field">
						<label class="label" for="temperature">Current Temperature (°C):</label>

						{{ input('number', 'fields[temperature]', status.temperature, {
							id: 'temperature',
							required: true,
							class: [
								'input',
								'input--number'
							]
						}) }}

					</div>

					<div class="field">
						<label class="label" for="waterTemperature">Water Temperature (°C):</label>

						{{ input('number', 'fields[waterTemperature]', status.waterTemperature, {
							id: 'waterTemperature',
							required: true,
							class: [
								'input',
								'input--number'
							]
						}) }}
					</div>

					<div class="field">
						<label>Resort Status:</label>
						<div class="radio-group">

							{% for option in status.resortStatus.options %}
								<div class="radio-option">
									{{ input('radio', 'fields[resortStatus]', option.value, {
										id: option.value | id,
										required: true,
										checked: option.selected,
										class: [
											'input',
											'input--radio'
										]
									}) }}
									{{ tag('label', {
										class: 'label',
										for: option.value | id,
										text: option.label
									})}}

								</div>
							{% endfor %}


						</div>
					</div>

					<div class="field">
						<label class="label" for="notes">Additional Notes:</label>

						{{ tag('textarea', {
								class: 'input input--textarea',
								id: 'notes',
								name: 'fields[notes]',
								rows: 3,
								text: status.notes
							})}}


					</div>


					<button type="submit" class="button">Update Resort Status</button>

				</fieldset>


			</class="label"form>

		</div>
	</div>


{% endblock %}

LifeguardController.php

<?php

namespace modules\lifeguard\controllers;

use Craft;
use craft\elements\Entry;
use craft\web\Controller;
use yii\web\Response;

/**
 * Lifeguard controller
 */
class LifeguardController extends Controller
{
    public $defaultAction = 'index';
    protected array|int|bool $allowAnonymous = self::ALLOW_ANONYMOUS_NEVER;

    /**
     * index
     */
    public function actionIndex(): Response
    {
        $this->requireLogin();

        $status = Entry::find()
            ->section('status')
            ->one();


        $variables = [
            'status' => $status
        ];

        return $this->renderTemplate('_lifeguard/index', $variables);
    }


    /**
     * update action
     * 
     * @return Response
     */
    public function actionUpdate(): Response
    {
        $this->requirePostRequest();
        $this->requireLogin();

        $request = $this->request;
        $fieldValuesFromRequest = $request->getBodyParam('fields');

        $status = Entry::find()
            ->section('status')
            ->one();

        $status->setFieldValues($fieldValuesFromRequest);

        if (!Craft::$app->getElements()->saveElement($status)) {
            Craft::$app->getSession()->setError(Craft::t('site', 'error while saving contact infos.'));
        }

        Craft::$app->getSession()->setNotice(Craft::t('site', 'Information has been saved.'));

        return $this->redirectToPostedUrl();
    }
}

routes.php

<?php

return [
    'lifeguard-admin' => 'lifeguard/lifeguard'
];