WP_REST_Menus_Controller::create_item() WordPress Method

	public function create_item( $request ) {
		if ( isset( $request['parent'] ) ) {
			if ( ! is_taxonomy_hierarchical( $this->taxonomy ) ) {
				return new WP_Error( 'rest_taxonomy_not_hierarchical', __( 'Cannot set parent term, taxonomy is not hierarchical.' ), array( 'status' => 400 ) );
			}

			$parent = wp_get_nav_menu_object( (int) $request['parent'] );

			if ( ! $parent ) {
				return new WP_Error( 'rest_term_invalid', __( 'Parent term does not exist.' ), array( 'status' => 400 ) );
			}
		}

		$prepared_term = $this->prepare_item_for_database( $request );

		$term = wp_update_nav_menu_object( 0, wp_slash( (array) $prepared_term ) );

		if ( is_wp_error( $term ) ) {
			/*
			 * If we're going to inform the client that the term already exists,
			 * give them the identifier for future use.
			 */

			if ( in_array( 'menu_exists', $term->get_error_codes(), true ) ) {
				$existing_term = get_term_by( 'name', $prepared_term->{'menu-name'}, $this->taxonomy );
				$term->add_data( $existing_term->term_id, 'menu_exists' );
				$term->add_data(
					array(
						'status'  => 400,
						'term_id' => $existing_term->term_id,
					)
				);
			} else {
				$term->add_data( array( 'status' => 400 ) );
			}

			return $term;
		}

		$term = $this->get_term( $term );

		/** This action is documented in wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php */
		do_action( "rest_insert_{$this->taxonomy}", $term, $request, true );

		$schema = $this->get_item_schema();
		if ( ! empty( $schema['properties']['meta'] ) && isset( $request['meta'] ) ) {
			$meta_update = $this->meta->update_value( $request['meta'], $term->term_id );

			if ( is_wp_error( $meta_update ) ) {
				return $meta_update;
			}
		}

		$locations_update = $this->handle_locations( $term->term_id, $request );

		if ( is_wp_error( $locations_update ) ) {
			return $locations_update;
		}

		$this->handle_auto_add( $term->term_id, $request );

		$fields_update = $this->update_additional_fields_for_object( $term, $request );

		if ( is_wp_error( $fields_update ) ) {
			return $fields_update;
		}

		$request->set_param( 'context', 'view' );

		/** This action is documented in wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php */
		do_action( "rest_after_insert_{$this->taxonomy}", $term, $request, true );

		$response = $this->prepare_item_for_response( $term, $request );
		$response = rest_ensure_response( $response );

		$response->set_status( 201 );
		$response->header( 'Location', rest_url( $this->namespace . '/' . $this->rest_base . '/' . $term->term_id ) );

		return $response;
	}