compare-geojson/oldComparators/city-deleted.js

Compare a features new and old versions in GeoJSON

'use strict';

module.exports = cityDeleted;

/**
* Identify deletion of a city.
* @param {object} newVersion Features new version in GeoJSON.
* @param {object} oldVersion Features old version in GeoJSON.
* @param {Function} callback called with (error, result).
* @returns {undefined} calls callback.
*/
function cityDeleted(newVersion, oldVersion, callback) {

  if (!newVersion || !oldVersion) {
    return callback(null, {});
  }

  var name = 'cityDeleted';
  // Note: newVersion does not have any tags, so using oldVersion.
  if (newVersion.deleted === true && oldVersion.tags && oldVersion.tags.place === 'city') {
    callback(null, {
      name: name,
      data: {
        'cityDeleted': true
      }
    });
  } else {
    callback(null, {
      name: name,
      data: {
        'cityDeleted': false
      }
    });
  }
}