Fetch membergroup by guid (#8496)

src/Umbraco.Core/Persistence/Repositories/IMemberGroupRepository.cs

@@ -1,10 +1,18 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using Umbraco.Core.Models;
 
 namespace Umbraco.Core.Persistence.Repositories
 {
     public interface IMemberGroupRepository : IReadWriteQueryRepository<int, IMemberGroup>
     {
+        /// <summary>
+        /// Gets a member group by it's uniqueId
+        /// </summary>
+        /// <param name="uniqueId"></param>
+        /// <returns></returns>
+        IMemberGroup Get(Guid uniqueId);
+
         /// <summary>
         /// Gets a member group by it's name
         /// </summary>

src/Umbraco.Core/Persistence/Repositories/Implement/MemberGroupRepository.cs

@@ -69,7 +69,7 @@ namespace Umbraco.Core.Persistence.Repositories.Implement
 
         protected override string GetBaseWhereClause()
         {
-            return "umbracoNode.id = @id";
+            return $"{Constants.DatabaseSchema.Tables.Node}.id = @id";
         }
 
         protected override IEnumerable<string> GetDeleteClauses()
@@ -115,6 +115,16 @@ namespace Umbraco.Core.Persistence.Repositories.Implement
             entity.ResetDirtyProperties();
         }
 
+        public IMemberGroup Get(Guid uniqueId)
+        {
+            var sql = GetBaseQuery(false);
+            sql.Where("umbracoNode.uniqueId = @uniqueId", new { uniqueId });
+
+            var dto = Database.Fetch<NodeDto>(SqlSyntax.SelectTop(sql, 1)).FirstOrDefault();
+
+            return dto == null ? null : MemberGroupFactory.BuildEntity(dto);
+        }
+
         public IMemberGroup GetByName(string name)
         {
             return IsolatedCache.GetCacheItem<IMemberGroup>(

src/Umbraco.Core/Services/Implement/MemberGroupService.cs

@@ -74,7 +74,7 @@ namespace Umbraco.Core.Services.Implement
         {
             using (var scope = ScopeProvider.CreateScope(autoComplete: true))
             {
-                return _memberGroupRepository.GetMany().FirstOrDefault(x => x.Key == id);
+                return _memberGroupRepository.Get(id);
             }
         }