An Umbraco (13.8+) Controller that re-publishes content and it's descendants. Useful for if you've made database changes and need the site to puiblish them without going into each.

PublishDescendantsController.cs

using Microsoft.AspNetCore.Mvc;
using Umbraco.Cms.Core.Models;
using Umbraco.Cms.Core.Services;
using Umbraco.Cms.Web.Common.Controllers;

namespace Website.Code
{
    public class PublishDescendantsController : UmbracoApiController
    {
        private readonly IContentService _contentService;
        private readonly ILogger _logger;

        public PublishDescendantsController(IContentService contentService,
            ILogger<PublishDescendantsController> logger)
        {
            _contentService = contentService;
            _logger = logger;
        }

        // POST me at /umbraco/PublishDescendants/PublishWithDescendants with a payload of { "key": "A GUID!" }
        public async Task<IActionResult> PublishWithDescendants([FromBody] PublishReq req)
        {
            _logger.LogInformation("Publish with descendants call made for Key {key}", req.Key.ToString());

            IContent? content = _contentService.GetById(req.Key)
                ?? throw new InvalidOperationException($"Could not find content with key: {req.Key}.");

            var results = _contentService.SaveAndPublishBranch(content, PublishBranchFilter.ForceRepublish);

            return new JsonResult(results);
        }
    }

    public class PublishReq
    {
        public Guid Key { get; set; }
    }
}