From 21cc40b27c82e9ab10c03be198ec00353b8a1861 Mon Sep 17 00:00:00 2001
From: IT-Talents <dev@it-talents.de>
Date: Fri, 18 May 2018 14:29:21 +0200
Subject: [PATCH 1/2] add method to set the entity short name, reset the
 querybuilder and reinit column arrays

---
 Response/DatatableQueryBuilder.php | 27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/Response/DatatableQueryBuilder.php b/Response/DatatableQueryBuilder.php
index ee2c5fca..71dbaa70 100644
--- a/Response/DatatableQueryBuilder.php
+++ b/Response/DatatableQueryBuilder.php
@@ -215,11 +215,6 @@ public function __construct(array $requestParams, DatatableInterface $datatable)
 
         $this->columns = $datatable->getColumnBuilder()->getColumns();
 
-        $this->selectColumns = array();
-        $this->searchColumns = array();
-        $this->orderColumns = array();
-        $this->joins = array();
-
         $this->options = $datatable->getOptions();
         $this->features = $datatable->getFeatures();
         $this->ajax = $datatable->getAjax();
@@ -234,6 +229,11 @@ public function __construct(array $requestParams, DatatableInterface $datatable)
      */
     private function initColumnArrays()
     {
+        $this->selectColumns = array();
+        $this->searchColumns = array();
+        $this->orderColumns = array();
+        $this->joins = array();
+
         foreach ($this->columns as $key => $column) {
             $dql = $this->accessor->getValue($column, 'dql');
             $data = $this->accessor->getValue($column, 'data');
@@ -776,6 +776,23 @@ private function getEntityShortName(ClassMetadata $metadata, EntityManagerInterf
         return $isReservedKeyword ? "_{$entityShortName}" : $entityShortName;
     }
 
+    /**
+     * Set entity short name.
+     *
+     * @param string $entityShortName
+     *
+     * @return $this
+     */
+    public function setEntityShortName($entityShortName)
+    {
+        $this->entityShortName = $entityShortName;
+
+        $this->qb = $this->em->createQueryBuilder()->from($this->entityName, $this->entityShortName);
+        $this->initColumnArrays();
+
+        return $this;
+    }
+
     /**
      * Get identifier.
      *

From 7da4ff0bfce1cf6c1e809f1c37d872477d6adb3f Mon Sep 17 00:00:00 2001
From: IT-Talents <dev@it-talents.de>
Date: Fri, 18 May 2018 14:46:43 +0200
Subject: [PATCH 2/2] add documentation

---
 Resources/doc/query.md | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/Resources/doc/query.md b/Resources/doc/query.md
index aba9af1e..4033107d 100644
--- a/Resources/doc/query.md
+++ b/Resources/doc/query.md
@@ -62,6 +62,33 @@ public function indexAction(Request $request)
 }
 ```
 
+If you need to override the entity alias, set the entity short name.
+
+``` php
+public function indexAction(Request $request)
+{
+    // ...
+
+    if ($request->isXmlHttpRequest()) {
+        $responseService = $this->get('sg_datatables.response');
+        $responseService->setDatatable($datatable);
+
+        $datatableQueryBuilder = $responseService->getDatatableQueryBuilder();
+        $datatableQueryBuilder->setEntityShortName('p');
+        
+        /** @var QueryBuilder $qb */
+        $qb = $datatableQueryBuilder->getQb();
+        $qb->andWhere('createdBy.username = :username');
+        $qb->setParameter('username', 'root');
+        $qb->andWhere('p.deleted = 0');
+
+        return $responseService->getResponse();
+    }
+
+    // ...
+}
+```
+
 ## 2. Subqueries
 
 Sometimes it is needed to count the number of rows or concatenate multiple fields.