protected function prepare_item_for_database( $request ) {

		$prepared = array();

		if ( isset( $request['id'] ) ) {
			$existing = $this->get_object( $request['id'] );
			if ( is_wp_error( $existing ) ) {
				return $existing;
			}
			$prepared['id'] = $existing->get( 'id' );
		}

		$schema = $this->get_item_schema();

		if ( ! empty( $schema['properties']['description'] ) && isset( $request['description'] ) ) {
			$prepared['description'] = $request['description'];
		}

		if ( ! empty( $schema['properties']['user_id'] ) && isset( $request['user_id'] ) ) {
			$prepared['user_id'] = (int) $request['user_id'];
		}

		if ( ! empty( $schema['properties']['permissions'] ) && isset( $request['permissions'] ) ) {
			$prepared['permissions'] = $request['permissions'];
		}

		return $prepared;

	}