threshold-ui/addons/api/mirage/serializers/host-set.js

import ApplicationSerializer from './application';
import { underscore } from '@ember/string';

export default ApplicationSerializer.extend({
  modelName: 'host-set',

  keyForRelationshipIds(relationshipName) {
    return `${this._container.inflector.singularize(
      underscore(relationshipName)
    )}_ids`;
  },

  _hashForModel(model) {
    const json = ApplicationSerializer.prototype._hashForModel.apply(
      this,
      arguments
    );
    json.host_catalog_id = model.hostCatalogId;
    if (model.hostIds?.length) {
      json.host_ids = model.hostIds;
    }
    return json;
  },
});