MAGE-986 Add backend model

Author: cammonro

Block/Adminhtml/System/Config/Form/Field/Checkboxes.php

@@ -13,7 +13,7 @@ protected function _getElementHtml(AbstractElement $element)
         $elementId = $element->getHtmlId();
         $name = $element->getName();
         $options = $element->getValues();
-        $values = $element->getValue() ? explode(',', $element->getValue()) : []; // store as CSV in config
+        $values = empty($element->getValue()) ? [] : explode(',', $element->getValue()); // store as CSV in config
 
         foreach ($options as $option) {
             $value = $option['value'];

Model/Backend/Checkboxes.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Algolia\AlgoliaSearch\Model\Backend;
+
+class Checkboxes extends \Magento\Framework\App\Config\Value
+{
+    public function beforeSave()
+    {
+        $value = $this->getValue();
+        if (is_array($value)) {
+            $this->setValue(implode(',', $value));
+        }
+        return parent::beforeSave();
+    }
+}

Model/Source/InstantSearchRedirectOptions.php

@@ -17,7 +17,7 @@ public function toOptionArray()
         return [
             [
                 'value' => self::REDIRECT_ON_PAGE_LOAD,
-                'label' => __('Redirect on page load (if InstantSearch loads with a redirect, immediately take the user to that URL.)'),
+                'label' => __('Redirect on page load (if InstantSearch loads with a redirect, immediately take the user to that URL)'),
             ],
             [
                 'value' => self::REDIRECT_ON_SEARCH_AS_YOU_TYPE,

etc/adminhtml/system.xml

@@ -570,6 +570,7 @@
                 <field id="options" translate="label comment" type="select" sortOrder="100" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Redirect options</label>
                     <frontend_model>Algolia\AlgoliaSearch\Block\Adminhtml\System\Config\Form\Field\Checkboxes</frontend_model>
+                    <backend_model>Algolia\AlgoliaSearch\Model\Backend\Checkboxes</backend_model>
                     <source_model>Algolia\AlgoliaSearch\Model\Source\InstantSearchRedirectOptions</source_model>
                     <depends><field id="enable">1</field></depends>
                 </field>