added exception when a member map is used with an _id alias.

lotosbin · Jun 24, 2010 · e04ebe2 · e04ebe2
1 parent 804c3fd
commit e04ebe2
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/source/MongoDB/Configuration/Mapping/Model/ClassMapBase.cs b/source/MongoDB/Configuration/Mapping/Model/ClassMapBase.cs
@@ -219,6 +219,9 @@ internal void AddMemberMap(PersistentMemberMap memberMap)
         /// <param name = "memberMaps">The member maps.</param>
         internal void AddMemberMaps(IEnumerable<PersistentMemberMap> memberMaps)
         {
+            if (memberMaps.Any(m => m.Alias == "_id"))
+                throw new MongoException("_id is a reserved MongoDB alias and cannot be used for anything other than an Id column.");
+
             _memberMaps.AddRange(memberMaps);
         }