Querying an array property in a collection with tingodb.

index.js

var fs = require('fs');
var path = require('path');
var engine = require('tingodb')({});

var dbPath = path.join(__dirname, 'db');

if (!fs.existsSync(dbPath)) {
  fs.mkdirSync(dbPath);
}

var db = new engine.Db(path.join(__dirname, 'db'), {});
var coll = db.collection('post');

function byPagination() {
  coll
    .find()
    .sort({'created_at': -1})
    .limit(5)
    .skip(0)
    .each(function _found(err, item) {
      console.log('sorted', item);
    });
}

function byTag() {
  coll.find({tags: 'test'}).each(function _found(err, item) {
    console.log('tagged', item);
  });
}

function _counted(err, count) {
  if (count) {
    // byPagination();
    byTag();
  } else {
    var posts = [];
    for (var i = 0, l = 10; i < l; i += 1) {
      posts.push({
        title: 'Post num: ' + i,
        body: 'Post about the number ' + i,
        tags: ['test', 'post', 'post-' + i],
        created_at: new Date(2013, i % 3, (i % 4) + 1)
      });
    }
    coll.insert(posts, function _inserted(err, items) {
      console.log(items.length);
      // byPagination();
      byTag();
    });
  }
}

function _indexTags(err, index) {
  console.log('Created index: ', index);
  coll.count(_counted);
}

function _indexCreatedAt(err, index) {
  console.log('Created index: ', index);
  coll.ensureIndex({'tags': 1}, {'_tiarr':true}, _indexTags);
}

coll.ensureIndex({'created_at': 1}, _indexCreatedAt);