server/AyaNova/biz/TagUtil.cs

@@ -2,6 +2,7 @@ using System.Collections.Generic;
 using System;
 using AyaNova.Util;
 using System.Linq;
+using Microsoft.EntityFrameworkCore;
 using AyaNova.Models;
 
 namespace AyaNova.Biz
@@ -51,20 +52,64 @@ namespace AyaNova.Biz
 
             if (newTags.Count == 0 && (originalTags == null || originalTags.Count == 0)) return;
 
-List<string> deleteTags=new List<string>();
-List<string> addTags=new List<string>();
-            
-            if(originalTags!=null){
+            List<string> deleteTags = new List<string>();
+            List<string> addTags = new List<string>();
+
+            if (originalTags != null)
+            {
                 //Update
                 //This logic is supposed to only come up with CHANGES, if the item is in both lists then it should disappear and not need to be dealt with
                 //testing will validate it
-                deleteTags=originalTags.Except(newTags).ToList();
-                addTags=newTags.Except(originalTags).ToList();
-                HERE
+                deleteTags = originalTags.Except(newTags).ToList();
+                addTags = newTags.Except(originalTags).ToList();
+
 
-            }else{
-                //Add
             }
+            else
+            {
+                //Add
+                addTags = newTags;
+            }
+
+
+            //ADD / INCREMENT TAGS
+
+            foreach (string s in addTags)
+            {
+                bool bDone = false;
+                //Keep on trying until there is success
+                //this allows for concurrency issues
+                do
+                {
+                    //START: Get tag word and concurrency token and count
+                    var ExistingTag = ct.Tag.FirstOrDefault(x => x.Name == s);
+                    //if not present, then add it with a count of 0
+                    if (ExistingTag == null)
+                    {
+                        ct.Tag.Add(new Tag() { Name = s, RefCount = 1 });
+                    }
+                    else
+                    {
+                        //Update the refcount
+                        ExistingTag.RefCount += 1;
+                    }
+                    try
+                    {
+                        ct.SaveChanges();
+                        bDone = true;
+                    }
+                    catch (Exception ex) when(ex is DbUpdateConcurrencyException )
+                    {
+                        //allow others to flow past
+                        string sss=ex.ToString();
+                    }
+
+                    //If that fails due to others added it or works, either way go back to START:
+                    //UPDATE: INCREMENT the refcount and update the record
+                    //If that fails due to a concurrency exception go to START:
+                } while (bDone == false);
+            }
+
 
             //Add / increase reference count for added tags
             //remove / decrease reference count for removed tags
@@ -98,13 +143,7 @@ WHERE name = 'bill'
             //Create table tags, word varchar 255, refcount longint, concurrency token
             //so do this: 
 
-            //ADD / INCREMENT TAGS
 
-            //START: Get tag word and concurrency token and count
-            //if not present, then add it with a count of 0
-            //If that fails due to others added it or works, either way go back to START:
-            //UPDATE: INCREMENT the refcount and update the record
-            //If that fails due to a concurrency exception go to START:
 
 
             //REMOVE / DECREMENT TAGS