expressjs + sequelizejs filterable route

index.js

app.get('/albums', function (req, res) {
  Album
    .findAll({
      where: getQueryFilters(req.query),
      order: ['albumartist']
    })
    .then((items)=> {
      res.json(items);
    });
});

function getQueryFilters(query) {
  let filters = null;
  if (query.filter) {
    filters = Object.keys(query.filter).map((attribute)=> {
      let filter = {};
      let value = query.filter[attribute];
      filter[attribute] = { $like: `%${value}%` }
      return filter;
    });
  }
  return filters;
}