fix for #60

src/Indexer/TNTIndexer.php

@@ -310,10 +310,14 @@ public function delete($documentId)
             ['key' => ':documentId', 'value' => $documentId]
         ]);
 
-        $this->prepareAndExecuteStatement("DELETE FROM wordlist WHERE num_hits = 0");
+        $res = $this->prepareAndExecuteStatement("DELETE FROM wordlist WHERE num_hits = 0");
 
-        $total = $this->totalDocumentsInCollection() - 1;
-        $this->updateInfoTable('total_documents', $total);
+        $affected = $res->rowCount();
+
+        if ($affected) {
+            $total = $this->totalDocumentsInCollection() - 1;
+            $this->updateInfoTable('total_documents', $total);
+        }
     }
 
     public function updateInfoTable($key, $value)

tests/TNTSearchTest.php

@@ -82,6 +82,35 @@ public function testSearchBoolean()
         $this->assertEquals([11], $res['ids']);
     }
 
+    /**
+     * https://github.com/teamtnt/tntsearch/issues/60
+     */
+    public function testTotalDocumentCountOnIndexUpdate()
+    {
+        $tnt = new TNTSearch;
+
+        $tnt->loadConfig($this->config);
+
+        $indexer                = $tnt->createIndex($this->indexName);
+        $indexer->disableOutput = true;
+        $indexer->query('SELECT id, title, article FROM articles;');
+        $indexer->run();
+
+        $tnt->selectIndex($this->indexName);
+        $this->assertEquals(12, $tnt->totalDocumentsInCollection());
+
+        $index = $tnt->getIndex();
+
+        //first we test if the total number of documents will decrease
+        $index->delete(12);
+        $this->assertEquals(11, $tnt->totalDocumentsInCollection());
+
+        //now we try with a document that does not exist, the total number should increase for 1
+        $index->update(1234, ['id' => '1234', 'title' => 'updated title', 'article' => 'updated article']);
+
+        $this->assertEquals(12, $tnt->totalDocumentsInCollection());
+    }
+
     public function testIndexUpdate()
     {
         $tnt = new TNTSearch;