*/
	public function delete_item( $request ) {

		$object = $this->get_object( $request['id'], false );

		// We don't return 404s for items that are not found.
		if ( ! is_wp_error( $object ) ) {

			// If there was an error deleting the object return the error. If the error is that the object doesn't exist return 204 below!
			$del = $this->delete_object( $object, $request );
			if ( is_wp_error( $del ) ) {
				return $del;
			}
		}

		$response = rest_ensure_response( null );
		$response->set_status( 204 );

		return $response;

	}

	/**
	 * Retrieves the query params for the objects collection.
	 *
	 * @since 1.0.0-beta.1
	 * @since 1.0.0-beta.12 Added `search_columns` collection param for searchable resources.
	 *
	 * @return array Collection parameters.
	 */
	public function get_collection_params() {

		$query_params = parent::get_collection_params();

		$query_params['context']['default'] = 'view';

		// We're not currently implementing searching for all of our controllers.
		if ( empty( $this->is_searchable ) ) {
			unset( $query_params['search'] );
		} elseif ( ! empty( $this->search_columns_mapping ) ) {

			$search_columns = array_keys( $this->search_columns_mapping );

			$query_params['search_columns'] = array(
				'description' => __( 'Column names to be searched. Accepts a single column or a comma separated list of columns.', 'lifterlms' ),
				'type'        => 'array',
				'items'       => array(
					'type' => 'string',
					'enum' => $search_columns,
				),
				'default'     => $search_columns,
			);
		}

		// page and per_page params are already specified in WP_Rest_Controller->get_collection_params().
		$query_params['order'] = array(
			'description'       => __( 'Order sort attribute ascending or descending.', 'lifterlms' ),
			'type'              => 'string',
			'default'           => 'asc',
			'enum'              => array( 'asc', 'desc' ),
			'validate_callback' => 'rest_validate_request_arg',
		);