get schema() {
    return this.registry.schema;
  }
A reference to the schema instance.

    Useful to reference registered schema information, for example in a Serializer's include hook to include all a resource's associations:

    ```js
    Serializer.extend({
      include(request, resource) {
        return Object.keys(this.schema.associationsFor(resource.modelName));
      }
    })
    ```

    @property
    @type {Object}
    @public