How to define traits when not using typescript?

[doutatsu]

I am not using typescript, so the documentation is a bit hard for me to read. How would I define a trait for a simple factory that I export here:

import { Factory } from 'fishery';

export default Factory.define(({ sequence }) => ({
  id: sequence,
  manga_series_id: 1,
  name: 'MangaDex',
  seriesURL: 'example.com',
  lastVolumeAvailable: 1,
  lastChapterAvailable: 2,
}));

[stevehanson]

@doutatsu here is an example of using traits with just JavaScript. The idea is to subclass Factory, and add your trait methods to that subclass:

class UserFactory extends Factory {
  admin() {
    return this.params({ admin: true });
  }
}

const factory = UserFactory.define(() => {
  return {
    admin: false,
    name: 'Jan'
  }
})

const user = factory.admin().build()
user.admin // true

Let me know if that helps or if you have further questions!

[doutatsu]

Finally got around to trying this out @stevehanson and it worked like a charm! Thanks a lot

[lamroger]

Hi @stevehanson - does there need to be anything special for the factory to live in a separate file?

The above example works when it's in a single file but when I try to break it out into

const { Factory } = require('fishery');

class DatasetFactory extends Factory {}

const factory = DatasetFactory.define(({ teamId, storageProviderId }) => ({
  teamId,
  storageProviderId,
  isPublic: false,
}));

module.export = factory;

const assert = require('chai').assert;

const DatasetFactory = require('test/factories/dataset');

describe.only('dataset', () => {
  it('does stuff', async () => {
    const dataset = DatasetFactory.build({
      teamId: 1,
      storageProviderId: 1,
    });

    assert.isNotNull(dataset);
  });
});

I get a error saying

 1) dataset
       does stuff:
     TypeError: DatasetFactory.build is not a function

Maybe this is just a JS issue I'm tripping over. Thanks for your help so far!