Improved tag export performance

src/Dao/TagDao.php

@@ -137,6 +137,52 @@ class TagDao extends AbstractDao implements ICrudDao
 		}
 	}
 
+	public function export()
+	{
+		$exported = [];
+		foreach ($this->fpdo->from('tags') as $arrayEntity)
+		{
+			$exported[$arrayEntity['id']] = [
+				'name' => $arrayEntity['name'],
+				'usages' => intval($arrayEntity['usages']),
+				'banned' => boolval($arrayEntity['banned'])
+			];
+		}
+
+		//upgrades on old databases
+		try
+		{
+			$relations = iterator_to_array($this->fpdo->from('tagRelations'));
+		}
+		catch (\Exception $e)
+		{
+			$relations = [];
+		}
+
+		foreach ($relations as $arrayEntity)
+		{
+			$key1 = $arrayEntity['tag1id'];
+			$key2 = $arrayEntity['tag2id'];
+			$type = intval($arrayEntity['type']);
+			if ($type === self::TAG_RELATION_IMPLICATION)
+				$target = 'implications';
+			elseif ($type === self::TAG_RELATION_SUGGESTION)
+				$target = 'suggestions';
+			else
+				continue;
+
+			if (!isset($exported[$key1]) or !isset($exported[$key2]))
+				continue;
+
+			if (!isset($exported[$key1][$target]))
+				$exported[$key1][$target] = [];
+
+			$exported[$key1][$target][] = $exported[$key2]['name'];
+		}
+
+		return array_values($exported);
+	}
+
 	private function findRelatedTagsByType(Tag $tag, $type)
 	{
 		$tagId = $tag->getId();

src/Services/TagService.php

@@ -70,33 +70,8 @@ class TagService
 
 	public function exportJson()
 	{
-		$tags = [];
-		foreach ($this->tagDao->findAll() as $tag)
-		{
-			$item = [
-				'name' => $tag->getName(),
-				'usages' => $tag->getUsages(),
-				'banned' => $tag->isBanned(),
-				'implications' => array_values(array_map(
-					function ($subTag)
-					{
-						return $subTag->getName();
-					},
-					$tag->getImpliedTags())),
-				'suggestions' => array_values(array_map(
-					function ($subTag)
-					{
-						return $subTag->getName();
-					},
-					$tag->getSuggestedTags())),
-			];
-			if (empty($item['implications']))
-				unset($item['implications']);
-			if (empty($item['suggestions']))
-				unset($item['suggestions']);
-			$tags[] = $item;
-		}
-		$json = json_encode($tags);
+		$exported = $this->tagDao->export();
+		$json = json_encode($exported);
 		$this->fileDao->save('tags.json', $json);
 	}