@bigtest/mirage/tests/integration/serializers/json-api-serializer/key-formatting-test.js

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import { Schema, Model, Db, SerializerRegistry, JSONAPISerializer, underscore } from '@bigtest/mirage';
import { module, test } from 'qunit';

module('Integration | Serializers | JSON API Serializer | Key Formatting', {
  beforeEach() {
    this.schema = new Schema(new Db(), {
      wordSmith: Model,
      photograph: Model
    });
  }
});

test(`keyForAttribute formats the attributes of a model`, function(assert) {
  let registry = new SerializerRegistry(this.schema, {
    application: JSONAPISerializer.extend({
      keyForAttribute(key) {
        return underscore(key);
      }
    })
  });
  let wordSmith = this.schema.wordSmiths.create({
    id: 1,
    firstName: 'Link',
    lastName: 'Jackson',
    age: 323
  });

  let result = registry.serialize(wordSmith);

  assert.deepEqual(result, {
    data: {
      type: 'word-smiths',
      id: '1',
      attributes: {
        age: 323,
        first_name: 'Link',
        last_name: 'Jackson'
      }
    }
  });
});

test(`keyForAttribute also formats the models in a collections`, function(assert) {
  let registry = new SerializerRegistry(this.schema, {
    application: JSONAPISerializer.extend({
      keyForAttribute(key) {
        return underscore(key);
      }
    })
  });

  this.schema.wordSmiths.create({ id: 1, 'firstName': 'Link', 'lastName': 'Jackson' });
  this.schema.wordSmiths.create({ id: 2, 'firstName': 'Zelda', 'lastName': 'Brown' });
  let wordSmiths = this.schema.wordSmiths.all();

  let result = registry.serialize(wordSmiths);

  assert.deepEqual(result, {
    data: [{
      type: 'word-smiths',
      id: '1',
      attributes: {
        'first_name': 'Link',
        'last_name': 'Jackson'
      }
    }, {
      type: 'word-smiths',
      id: '2',
      attributes: {
        'first_name': 'Zelda',
        'last_name': 'Brown'
      }
    }]
  });
});