Class DS.Transform

The DS.Transform class is used to serialize and deserialize model attributes when they are saved or loaded from an adapter. Subclassing DS.Transform is useful for creating custom attributes. All subclasses of DS.Transform must implement a serialize and a deserialize method.

Example

1
2
3
4
5
6
7
8
9
10
11
12

import DS from 'ember-data';

// Converts centigrade in the JSON to fahrenheit in the app
export default DS.Transform.extend({
  deserialize(serialized, options) {
    return (serialized *  1.8) + 32;
  },

  serialize(deserialized, options) {
    return (deserialized - 32) / 1.8;
  }
});

The options passed into the DS.attr function when the attribute is declared on the model is also available in the transform.

1
2
3
4
5
6
7
8
9

export default DS.Model.extend({
  title: DS.attr('string'),
  markdown: DS.attr('markdown', {
    markdown: {
      gfm: false,
      sanitize: true
    }
  })
});

1
2
3
4
5
6
7
8
9
10
11

export default DS.Transform.extend({
  serialize(deserialized, options) {
    return deserialized.raw;
  },

  deserialize(serialized, options) {
    var markdownOptions = options.markdown || {};

    return marked(serialized, markdownOptions);
  }
});

Usage

1
2
3
4
5
6

import DS from 'ember-data';

export default DS.Model.extend({
  name: DS.attr('string'),
  temperature: DS.attr('temperature')
});

1
2
3

deserialize(serialized, options) {
  return empty(serialized) ? null : Number(serialized);
}

1
2
3
4
5

import { isEmpty } from '@ember/utils';

serialize(deserialized, options) {
  return isEmpty(deserialized) ? null : Number(deserialized);
}