#45 => done

app/dependencies.php

@@ -148,6 +148,10 @@ $container->set('App\Action\AttributeAction', function (ContainerInterface $c) {
     return new App\Action\AttributeAction($c->get('em'));
 });
 
+$container->set('App\Action\AttributeDistinctAction', function (ContainerInterface $c) {
+    return new App\Action\AttributeDistinctAction($c->get('em'), new App\Utils\DBALConnectionFactory());
+});
+
 $container->set('App\Action\SearchAction', function (ContainerInterface $c) {
     return new App\Action\SearchAction(
         $c->get('em'),

app/routes.php

@@ -34,4 +34,5 @@ $app->map([OPTIONS, GET, POST], '/output-family/{id}/output-category', App\Actio
 $app->map([OPTIONS, GET, PUT, DELETE], '/output-category/{id}', App\Action\OutputCategoryAction::class);
 $app->map([OPTIONS, GET], '/dataset/{name}/attribute', App\Action\AttributeListAction::class);
 $app->map([OPTIONS, GET, PUT], '/dataset/{name}/attribute/{id}', App\Action\AttributeAction::class);
+$app->map([OPTIONS, GET, PUT], '/dataset/{name}/attribute/{id}/distinct', App\Action\AttributeDistinctAction::class);
 $app->get('/search/{dname}', App\Action\SearchAction::class);

docker-compose.yml

@@ -6,8 +6,8 @@ services:
         working_dir: /project
         environment:
             docker: "true"
-            DISPLAY_ERROR_DETAILS: "false"
-            DATABASE_DEV_MODE: 0
+            DISPLAY_ERROR_DETAILS: "true"
+            DATABASE_DEV_MODE: 1
             DATABASE_CO_DRIVER: "pdo_pgsql"
             DATABASE_CO_HOST: "db"
             DATABASE_CO_PORT: 5432

src/Action/AttributeDistinctAction.php

+<?php
+
+/*
+ * This file is part of Anis Server.
+ *
+ * (c) Laboratoire d'Astrophysique de Marseille / CNRS
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+declare(strict_types=1);
+
+namespace App\Action;
+
+use Psr\Http\Message\ServerRequestInterface as Request;
+use Psr\Http\Message\ResponseInterface as Response;
+use Slim\Exception\HttpNotFoundException;
+use Doctrine\ORM\EntityManagerInterface;
+use App\Utils\DBALConnectionFactory;
+use PDO;
+
+final class AttributeDistinctAction extends AbstractAction
+{
+    private $connectionFactory;
+
+    /**
+     * Create the classe before call __invoke to execute the action
+     *
+     * @param EntityManagerInterface $em Doctrine       Entity Manager Interface
+     * @param DBALConnectionFactory  $connectionFactory Factory used to construct connection to business database
+     */
+    public function __construct(EntityManagerInterface $em, DBALConnectionFactory $connectionFactory)
+    {
+        parent::__construct($em);
+        $this->connectionFactory = $connectionFactory;
+    }
+
+    /**
+     * `GET` Returns a list of distinct values found for this attribute into the business database
+     *
+     * @param  ServerRequestInterface $request  PSR-7 This object represents the HTTP request
+     * @param  ResponseInterface      $response PSR-7 This object represents the HTTP response
+     * @param  string[]               $args     This table contains information transmitted in the URL (see routes.php)
+     *
+     * @return ResponseInterface
+     */
+    public function __invoke(Request $request, Response $response, array $args): Response
+    {
+        if ($request->getMethod() === OPTIONS) {
+            return $response->withHeader('Access-Control-Allow-Methods', 'GET, OPTIONS');
+        }
+
+        $attribute = $this->em->getRepository('App\Entity\Attribute')->findOneBy(
+            array('dataset' => $args['name'], 'id' => $args['id'])
+        );
+
+        // If attribute is not found 404
+        if (is_null($attribute)) {
+            throw new HttpNotFoundException(
+                $request,
+                'Attribute with dataset name ' . $args['name'] . ' and attribute id ' . $args['id'] . ' is not found'
+            );
+        }
+
+        if ($request->getMethod() === GET) {
+            // Create query builder with from clause using dataset information
+            // With select, group by and order by clauses using attribute information
+            $dataset = $attribute->getDataset();
+            $column = $attribute->getTableName() . '.' . $attribute->getName();
+            $connection = $this->connectionFactory->create($dataset->getProject()->getDatabase());
+            $queryBuilder = $connection->createQueryBuilder();
+            $queryBuilder->select($column . ' as ' . $attribute->getLabel());
+            $queryBuilder->from($dataset->getTableRef());
+            $queryBuilder->groupBy($column);
+            $queryBuilder->orderBy($column);
+
+            // Execute query and returns response
+            $stmt = $queryBuilder->execute();
+            $rows = $stmt->fetchAll(PDO::FETCH_COLUMN, 0);
+            $payload = json_encode($rows);
+        }
+
+        $response->getBody()->write($payload);
+        return $response;
+    }
+}

src/Entity/Attribute.php

@@ -274,6 +274,11 @@ class Attribute implements \JsonSerializable
         return $this->id;
     }
 
+    public function getDataset()
+    {
+        return $this->dataset;
+    }
+
     public function getName()
     {
         return $this->name;