Parse tag string to query map, check user is exists at same time.

parse-tag-to-query.js

const User = require('./models/user');

description('Tag parser', () => {
  it('should parse tag stirng to query map, and remove query when user is not exists', async () => {
    // bob, id: 1
    // foo, id: 2
    // system is no such user
    const tagString = 'fav:bob fav:foo fav:system threshold:1';
    const queryMap = await tagString
      .split(/\s+/)
      .reduce(async (accuPromise, tag) => {
        const [, name, value] = tag.match(/^(.+):(.+)$/);
        if (/^fav/.test(name)) {
          const user = await User.find({ where: { name } });
          if (user) {
            const accumulator = await accuPromise;
            return Promise.resolve({ ...accumulator, [name]: user.id });
          }

          return accuPromise;
        }

        const accumulator = await accuPromise;
        return Promise.resolve({ ...accumulator, [name]: value });
      }, Promise.resolve({}));

    expect(queryMap).toEqual({ fav: [1, 2], threshold: ['1'] });
  });
});