Add a clear command. Fixes #5

Command/ClearCommand.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace Algolia\AlgoliaSearchBundle\Command;
+
+use Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class ClearCommand extends ContainerAwareCommand
+{
+    protected function configure()
+    {
+        $this
+            ->setName('algolia:clean')
+            ->setDescription('Clear the index related to an entity')
+            ->addArgument('entityName', InputArgument::OPTIONAL, 'Which entity index do you want to clear? If not set, all is assumed.')
+        ;
+    }
+
+    protected function getEntityManager()
+    {
+        return $this
+            ->getContainer()
+            ->get('doctrine.orm.entity_manager');
+    }
+
+    protected function getEntityClasses()
+    {
+        $metaData = $this->getEntityManager()
+            ->getMetadataFactory()
+            ->getAllMetaData();
+
+        return array_map(function ($data) {
+            return $data->getName();
+        }, $metaData);
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $toReindex = [];
+
+        if ($input->hasArgument('entityName')) {
+            $filter = $this->getEntityManager()->getRepository($input->getArgument('entityName'))->getClassName();
+        } else {
+            $filter = null;
+        }
+
+        foreach ($this->getEntityClasses() as $class) {
+            if (!$filter || $class === $filter) {
+                $toReindex[] = $class;
+            }
+        }
+
+        $nIndexed = 0;
+        foreach ($toReindex as $className) {
+            $nIndexed += $this->clear($className);
+        }
+
+        return $nIndexed;
+    }
+
+    public function clear($className)
+    {
+        $reIndexer = $this->getContainer()->get('algolia.indexer')->getManualIndexer($this->getEntityManager());
+
+        return $reIndexer->clear($className);
+    }
+}

Indexer/ManualIndexer.php

@@ -181,6 +181,17 @@ public function unIndex($entities, array $options = array())
         }
     }
 
+    public function clear($entityName)
+    {
+        $className =  $this->entityManager->getRepository($entityName)->getClassName();
+
+        $this->indexer->discoverEntity($className, $this->entityManager);
+
+        $targetIndexName = $this->indexer->getAlgoliaIndexName($className);
+
+        $this->indexer->getIndex($targetIndexName)->clearIndex();
+    }
+
     /**
      * Re-index entities from a collection.
      *