load postal codes dynamically

Form/ChoiceLoader/PostalCodeChoiceLoader.php

@@ -0,0 +1,85 @@
+<?php
+/*
+ * Copyright (C) 2018 Champs-Libres <info@champs-libres.coop>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+namespace Chill\MainBundle\Form\ChoiceLoader;
+
+use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface;
+use Symfony\Component\Form\ChoiceList\ChoiceListInterface;
+use Chill\MainBundle\Repository\PostalCodeRepository;
+use Symfony\Component\Form\ChoiceList\LazyChoiceList;
+use Chill\MainBundle\Entity\PostalCode;
+
+/**
+ * 
+ *
+ * @author Julien Fastré <julien.fastre@champs-libres.coop>
+ */
+class PostalCodeChoiceLoader implements ChoiceLoaderInterface
+{
+    /**
+     *
+     * @var PostalCodeRepository
+     */
+    protected $postalCodeRepository;
+    
+    protected $lazyLoadedPostalCodes = [];
+    
+    public function __construct(PostalCodeRepository $postalCodeRepository)
+    {
+        $this->postalCodeRepository = $postalCodeRepository;
+    }
+
+    public function loadChoiceList($value = null): ChoiceListInterface
+    {
+        $list = new \Symfony\Component\Form\ChoiceList\ArrayChoiceList(
+            $this->lazyLoadedPostalCodes, 
+            function(PostalCode $pc) use ($value) {
+                return \call_user_func($value, $pc);
+            });
+        
+        return $list;
+    }
+
+    public function loadChoicesForValues(array $values, $value = null)
+    {
+        $choices = [];
+        
+        foreach($values as $value) {
+            $choices[] = $this->postalCodeRepository->find($value);
+        }
+
+        return $choices;
+    }
+    
+    public function loadValuesForChoices(array $choices, $value = null)
+    {
+        $values = [];
+        
+        foreach ($choices as $choice) {
+            if (NULL === $choice) {
+                $values[] = null;
+                continue;
+            }
+            
+            $id = \call_user_func($value, $choice);
+            $values[] = $id;
+            $this->lazyLoadedPostalCodes[$id] = $choice;
+        }
+        
+        return $values;
+    }
+}

Form/Type/PostalCodeType.php

@@ -21,10 +21,14 @@ namespace Chill\MainBundle\Form\Type;
 
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\OptionsResolver\OptionsResolver;
-use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Bridge\Doctrine\Form\Type\EntityType;
 use Chill\MainBundle\Templating\TranslatableStringHelper;
 use Chill\MainBundle\Entity\PostalCode;
+use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Form\FormView;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+use Chill\MainBundle\Form\ChoiceLoader\PostalCodeChoiceLoader;
+use Symfony\Component\Translation\TranslatorInterface;
 
 /**
  * A form to pick between PostalCode
@@ -39,10 +43,35 @@ class PostalCodeType extends AbstractType
      * @var TranslatableStringHelper
      */
     protected $translatableStringHelper;
+    
+    /**
+     *
+     * @var UrlGeneratorInterface
+     */
+    protected $urlGenerator;
+    
+    /**
+     *
+     * @var PostalCodeChoiceLoader
+     */
+    protected $choiceLoader;
+    
+    /**
+     *
+     * @var TranslatorInterface
+     */
+    protected $translator;
 
-    public function __construct(TranslatableStringHelper $helper)
-    {
+    public function __construct(
+        TranslatableStringHelper $helper,
+        UrlGeneratorInterface $urlGenerator,
+        PostalCodeChoiceLoader $choiceLoader,
+        TranslatorInterface $translator
+    ) {
         $this->translatableStringHelper = $helper;
+        $this->urlGenerator = $urlGenerator;
+        $this->choiceLoader = $choiceLoader;
+        $this->translator = $translator;
     }
 
 
@@ -55,11 +84,26 @@ class PostalCodeType extends AbstractType
     {
         // create a local copy for usage in Closure
         $helper = $this->translatableStringHelper;
-        $resolver->setDefault('class', PostalCode::class)
+        $resolver
+            ->setDefault('class', PostalCode::class)
             ->setDefault('choice_label', function(PostalCode $code) use ($helper) {
                 return $code->getCode().' '.$code->getName().' ['.
                       $helper->localize($code->getCountry()->getName()).']';
-           }
-        );
+           })
+           ->setDefault('choice_loader', $this->choiceLoader)
+           ->setDefault('placeholder', 'Select a postal code')
+        ;
     }
+    
+    public function buildView(FormView $view, FormInterface $form, array $options)
+    {
+        $view->vars['attr']['data-postal-code'] = 'data-postal-code';
+        $view->vars['attr']['data-search-url'] = $this->urlGenerator
+            ->generate('chill_main_postal_code_search');
+        $view->vars['attr']['data-placeholder'] = $this->translator->trans($options['placeholder']);
+        $view->vars['attr']['data-no-results-label'] = $this->translator->trans('select2.no_results');
+        $view->vars['attr']['data-error-load-label'] = $this->translator->trans('select2.error_loading');
+        $view->vars['attr']['data-searching-label'] = $this->translator->trans('select2.searching');
+    }
+
 }