"Auto Relations" for MNTP

TrackUsages

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Umbraco.Core.Models;
using Umbraco.Core.Services;
using Umbraco.Web;

namespace Client.Umbraco.Extensions.Events
{
    public class TrackUsages
    {

        public static void HandleSave(IContentService sender, global::Umbraco.Core.Events.SaveEventArgs<global::Umbraco.Core.Models.IContent> e)
        {
            foreach (var savedNode in e.SavedEntities)
            {
                if (savedNode == null)
                    continue;

                HandleProperty(savedNode, Constants.Properties.PageAlerts, Constants.RelationTypes.AlertToPage, sender);
                HandleProperty(savedNode, Constants.Properties.PageCallouts, Constants.RelationTypes.CalloutToPage, sender);
            }
        }

        private static void HandleProperty(IContent savedNode, string propertyAlias, string relationTypeAlias, IContentService contentService)
        {
            if (savedNode.HasProperty(propertyAlias))
            {
                ClearRelationsForNode(savedNode, relationTypeAlias);
                AddRelationsForNodeFromCsv(savedNode.GetValue<string>(propertyAlias), relationTypeAlias, savedNode, contentService);
            }
        }

        private static void ClearRelationsForNode(IContent node, string relationTypeAlias)
        {
            var relationService = UmbracoContext.Current.Application.Services.RelationService;
            var relatedPages = relationService.GetByChild(node, relationTypeAlias);

            foreach (var relation in relatedPages)
            {
                relationService.Delete(relation);
            }
        }

        private static void AddRelationsForNodeFromCsv(string parentNodeIdsCsv, string relationTypeAlias, IContent childNode, IContentService contentService)
        {
            if (string.IsNullOrEmpty(parentNodeIdsCsv))
                return;

            var relationService = UmbracoContext.Current.Application.Services.RelationService;

            var parentNodeIds = parentNodeIdsCsv.Split(new [] { ',' }, StringSplitOptions.RemoveEmptyEntries);

            foreach (var parentNodeIdStr in parentNodeIds)
            {
                var parentNodeId = 0;
                if (int.TryParse(parentNodeIdStr, out parentNodeId))
                {
                    var parentContent = contentService.GetById(parentNodeId);
                    if (parentContent != null)
                    {
                        relationService.Relate(parentContent, childNode, relationTypeAlias);
                    }
                }
            }
        }
    }
}