transform.js

import _ from "lodash";

export default {
  /*
   * Convert objects returned from the API in to pure GeoJSON objects ready to be consumed by the map service.
   */
  transformToGeoJSON: function (data) {
    let featureCollectionTemplate = `{
      "type": "FeatureCollection",
      "features": []
    }`;
    let featureTemplate = `{
      "type": "Feature",
      "properties": {},
      "geometry": {}
    }`;
    let pointTemplate = `{
      "type": "Point",
      "coordinates": []
    }`;

    // Iterate over the array, converting to a new object type
    let results = _.compact(
      data.map((element) => {
        // If it has geometry let that take precedence
        let newEl = JSON.parse(featureTemplate);
        if (element.hasGeometry) {
          newEl.geometry = JSON.parse(element.hasGeometry.asJSON._value);
          newEl.properties = element; // Copy the raw object on to properties
          return newEl;
          // Else use latitude and longitude
        } else if (element.lat && element.long) {
          newEl.geometry = JSON.parse(pointTemplate);
          newEl.geometry.coordinates = [element.long, element.lat];
          newEl.properties = element; // Copy the raw object on to properties
          return newEl;
        }
      }),
    );

    // Wrap the whole object up in GeoJSON wrapper object
    let result = JSON.parse(featureCollectionTemplate);
    result.features = results;
    return result;
  },
};