Fixed the search engine for PostgreSQL databases

Controller/AdminController.php

@@ -17,6 +17,7 @@
 
 namespace JavierEguiluz\Bundle\EasyAdminBundle\Controller;
 
+use Doctrine\DBAL\Platforms\PostgreSqlPlatform;
 use Doctrine\ORM\EntityManager;
 use Doctrine\ORM\Mapping\ClassMetadataInfo;
 use Symfony\Component\EventDispatcher\GenericEvent;
@@ -506,11 +507,17 @@ protected function findAll($entityClass, $page = 1, $maxPerPage = 15, $sortField
      */
     protected function findBy($entityClass, $searchQuery, array $searchableFields, $page = 1, $maxPerPage = 15)
     {
+        $dbIsPostgreSql = $this->isPostgreSqlUsedByEntity($entityClass);
         $queryBuilder = $this->em->createQueryBuilder()->select('entity')->from($entityClass, 'entity');
 
         $queryConditions = $queryBuilder->expr()->orX();
         $queryParameters = array();
         foreach ($searchableFields as $name => $metadata) {
+            // PostgreSQL doesn't allow to compare strings values with non-string columns (e.g. 'id')
+            if ($dbIsPostgreSql && !in_array($metadata['type'], array('text', 'string'))) {
+                continue;
+            }
+
             if (in_array($metadata['dataType'], array('text', 'string'))) {
                 $queryConditions->add(sprintf('entity.%s LIKE :query', $name));
                 $queryParameters['query'] = '%'.$searchQuery.'%';
@@ -697,4 +704,18 @@ public function renderCssAction()
 
         return $response;
     }
+
+    /**
+     * Returns true if the data of the given entity are stored in a database
+     * of Type PostgreSQL.
+     *
+     * @param  string  $entityClass
+     * @return boolean
+     */
+    private function isPostgreSqlUsedByEntity($entityClass)
+    {
+        $em = $this->get('doctrine')->getManagerForClass($entityClass);
+
+        return $em->getConnection()->getDatabasePlatform() instanceof PostgreSqlPlatform;
+    }
 }