Tag.findAll({where: {ids: [1, 2]}})
// result => [{id: 1, name: 'video',}, {id: 2, name: 'music',}]

if(req.body.tagIds){
    let tags = [];
    (async () => {
      await req.body.tagIds.split(",").forEach(id => {
        (async () => {
          let tag = await Tag.findByPk(id);
          tag = await tag.get();
          tags.push(tag);
         })()
      })
      newMedia.addTags(tags);
      res.send(newMedia);
    })()
}