Error when composing collect, mapBy and sum

[gabrielgrant]

I have three props (downloadTime, processTime, uploadTime) each of which have an asMilliseconds prop. I want to sum those.

doing

{
  ...
  totalTimeMS: sum(array.mapBy(collect('downloadTime', 'processTime', 'uploadTime'), 'asMilliseconds')),
  ...
}

fails:

ember.debug.js:29026 Error while processing route: <route-name> (0 , _emberMacroHelpersCollapseKeys.collapseKeysWithMap) is not a function TypeError: (0 , _emberMacroHelpersCollapseKeys.collapseKeysWithMap) is not a function
    at Object.<anonymous> (http://localhost:4200/assets/vendor.js:180009:89)
    at Module.callback (http://localhost:4200/assets/pachdash.js:3248:73)
    at Module.exports (http://localhost:4200/assets/vendor.js:119:32)
    at requireModule (http://localhost:4200/assets/vendor.js:34:18)
    at Class._extractDefaultExport (http://localhost:4200/assets/vendor.js:182548:20)
    at Class.resolveOther (http://localhost:4200/assets/vendor.js:182245:32)
    at Class.superWrapper [as resolveOther] (http://localhost:4200/assets/vendor.js:56585:22)
    at Class.resolve (http://localhost:4200/assets/vendor.js:21030:35)
    at resolve (http://localhost:4200/assets/vendor.js:18426:36)
    at Registry.resolve (http://localhost:4200/assets/vendor.js:17885:21)

ember.debug.js:18015 TypeError: (0 , _emberMacroHelpersCollapseKeys.collapseKeysWithMap) is not a function
    at Object.<anonymous> (create-class-computed.js:60)
    at Module.callback (datum-stats.js:7)
    at Module.exports (loader.js:114)
    at requireModule (loader.js:29)
    at Class._extractDefaultExport (resolver.js:382)
    at Class.resolveOther (resolver.js:79)
    at Class.superWrapper [as resolveOther] (ember.debug.js:40879)
    at Class.resolve (ember.debug.js:5324)
    at resolve (ember.debug.js:2720)
    at Registry.resolve (ember.debug.js:2179)

However what seems to be the pure Ember/JS equivalent works fine:

{
  ...
  _durations: Ember.computed.collect('downloadTime', 'processTime', 'uploadTime'),
  totalTime: Ember.computed('_durations.[]', function() {
    let durationsMS = this.get('_durations').mapBy('asMilliseconds');
    let totalTimeMS = durationsMS.reduce((a, b) => a+b, 0);
    return Duration.create({value: totalTimeMS});
  }),
  ...
}

[kellyselden]

Thanks for the issue. If you could submit a failing test, that would greatly speed up the fixing process.