engineers_with_collector.js

var noLocationStr = function(origin) {
  return !!origin.get('location_str');
};

var withStatus = function(foreignKey, statuses, origin) {
  return origin
    .set('status', statuses.find(s => s.get(foreignKey) == origin.get('id')));
};

var withLocation = function(locations, locationStr, origin) {
  return origin
    .set(
      'location',
      locations.find(l => l.get('location_strs').contains(locationStr))
    );
};

var hasExtremeLocation = function(origin) {
  return origin.getIn(['location', 'extreme?']);
}

var collectEngineers = function(data) {
  return t.sequence(
    t.combine(
      t.filter(noLocationStr),
      t.map(withStatus.bind('engineer_id', data.get('statuses')))
      t.map(withLocation.bind(data.get('locations')))
      t.filter(hasExtremeLocation)
    ),
    data.get('engineers')
  );
};

var uiState = I.Map({
  engineers: collectEngineers(data)
});

React.render(<Engineers engineers={uiState.get('engineers')} />, document.body);