Auto configure BsonClassMap for IHasExtraProperties

framework/src/Volo.Abp.MongoDB/Volo/Abp/MongoDB/AbpGlobalBsonClassMap.cs

@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using MongoDB.Bson.Serialization;
+using Volo.Abp.Data;
+
+namespace Volo.Abp.MongoDB
+{
+    public static class AbpGlobalBsonClassMap
+    {
+        private static readonly HashSet<Type> PreConfiguredTypes = new HashSet<Type>();
+
+        /// <summary>
+        /// Configure default/base properties for the entity using <see cref="BsonClassMap"/>.
+        /// This method runs single time for an <typeparamref name="TEntity"/> for the application lifetime.
+        /// Subsequent calls has no effect for the same <typeparamref name="TEntity"/>.
+        /// </summary>
+        public static void ConfigureDefaults<TEntity>()
+        {
+            ConfigureDefaults(typeof(TEntity));
+        }
+
+        /// <summary>
+        /// Configure default/base properties for the entity using <see cref="BsonClassMap"/>.
+        /// This method runs single time for an <paramref name="entityType"/> for the application lifetime.
+        /// Subsequent calls has no effect for the same <paramref name="entityType"/>.
+        /// </summary>
+        public static void ConfigureDefaults(Type entityType)
+        {
+            lock (PreConfiguredTypes)
+            {
+                if (PreConfiguredTypes.Contains(entityType))
+                {
+                    return;
+                }
+
+                ConfigureDefaultsInternal(entityType);
+                PreConfiguredTypes.Add(entityType);
+            }
+        }
+
+        private static void ConfigureDefaultsInternal(Type entityType)
+        {
+            var map = new BsonClassMap(entityType);
+
+            map.AutoMap();
+
+            if (entityType.IsAssignableTo<IHasExtraProperties>())
+            {
+                map.SetExtraElementsMember(
+                    new BsonMemberMap(
+                        map,
+                        entityType.GetMember(nameof(IHasExtraProperties.ExtraProperties))[0]
+                    )
+                );
+            }
+
+            BsonClassMap.RegisterClassMap(map);
+        }
+    }
+}

framework/src/Volo.Abp.MongoDB/Volo/Abp/MongoDB/MongoModelSource.cs

@@ -58,6 +58,8 @@ namespace Volo.Abp.MongoDB
             {
                 b.CollectionName = collectionAttribute?.CollectionName ?? collectionProperty.Name;
             });
+
+            AbpGlobalBsonClassMap.ConfigureDefaults(entityType);
         }
 
         protected virtual void BuildModelFromDbContextInstance(IMongoModelBuilder modelBuilder, AbpMongoDbContext dbContext)