/**
  * @param \Mageplaza\Blog\Model\Post $post
  * @return $this
  */
 protected function saveTagRelation(\Mageplaza\Blog\Model\Post $post)
 {
     $post->setIsChangedTagList(false);
     $id = $post->getId();
     $tags = $post->getTagsData();
     if ($tags === null) {
         return $this;
     }
     $oldTags = $post->getTagsPosition();
     $insert = array_diff_key($tags, $oldTags);
     $delete = array_diff_key($oldTags, $tags);
     $update = array_intersect_key($tags, $oldTags);
     $_update = [];
     foreach ($update as $key => $settings) {
         if (isset($oldTags[$key]) && $oldTags[$key] != $settings['position']) {
             $_update[$key] = $settings;
         }
     }
     $update = $_update;
     $adapter = $this->getConnection();
     if (!empty($delete)) {
         $condition = ['tag_id IN(?)' => array_keys($delete), 'post_id=?' => $id];
         $adapter->delete($this->postTagTable, $condition);
     }
     if (!empty($insert)) {
         $data = [];
         foreach ($insert as $tagId => $position) {
             $data[] = ['post_id' => (int) $id, 'tag_id' => (int) $tagId, 'position' => (int) $position['position']];
         }
         $adapter->insertMultiple($this->postTagTable, $data);
     }
     if (!empty($update)) {
         foreach ($update as $tagId => $position) {
             $where = ['post_id = ?' => (int) $id, 'tag_id = ?' => (int) $tagId];
             $bind = ['position' => (int) $position['position']];
             $adapter->update($this->postTagTable, $bind, $where);
         }
     }
     if (!empty($insert) || !empty($delete)) {
         $tagIds = array_unique(array_merge(array_keys($insert), array_keys($delete)));
         $this->eventManager->dispatch('mageplaza_blog_post_change_tags', ['post' => $post, 'tag_ids' => $tagIds]);
     }
     if (!empty($insert) || !empty($update) || !empty($delete)) {
         $post->setIsChangedTagList(true);
         $tagIds = array_keys($insert + $delete + $update);
         $post->setAffectedTagIds($tagIds);
     }
     return $this;
 }