shared/lookup-parser.js

   1 'use strict';
   2
   3 var _ = require('lodash');
   4
   5 var exports = module.exports;
   6
   7 function parseLookups(response, fill) {
   8   /*
   9   response contains {lookups: {}, items: []}
  10
  11   fill is a map of attribute: lookupName where attribute is the result
  12   attribute that holds the id (fromUser) and lookupName is the name of a key
  13   inside lookups that holds the array of values (users).
  14
  15   This function will change response.items in place so that each lookup
  16   attribute in there will get the full value from lookups.
  17
  18   Do not use this directly, but rather make/use one function that parses each
  19   API response type. ie parseChatResults(response)
  20   */
  21
  22   // map the lookups by id
  23   // ie. users: [] becomes users: {}
  24   var lookupNames = Object.keys(response.lookups);
  25   var maps = {};
  26   _.each(lookupNames, function(lookupName) {
  27     var map = _.indexBy(response.lookups[lookupName], 'id');
  28     maps[lookupName] = map;
  29   });
  30
  31   // fill the lookup values in place
  32   // ie. result.fromUser which is an id becomes an object
  33   _.each(response.items, function(item) {
  34     _.each(fill, function(lookupName, attribute) {
  35       item[attribute] = maps[lookupName][item[attribute]];
  36     });
  37   });
  38
  39   return response.items;
  40 }
  41 exports.parseLookups = parseLookups;
  42
  43 function parseChats(response) {
  44   return parseLookups(response, { fromUser: 'users' });
  45 }
  46 exports.parseChats = parseChats;