gistfile1.js

var ddoc = {
  _id: '_design/index',
  views: {
    index: {
      map: function mapFun(doc) {
        if (doc.table_name) {
          emit(doc.table_name);
        }
      }.toString()
    }
  }
}

// save the design doc
localDb.put(ddoc).catch(function (err) {
  if (err.status !== 409) {
    throw err;
  }
  // ignore if doc already exists
}).then(function () {
  // find docs where table_name === 'channels'
  return localDb.query('index', {
    key: 'channels',
    include_docs: true
  });
}).then(function (result) {
  // handle result
console.log(result);
}).catch(function (err) {
  console.log(err);
});