#1580 Removed setter for IEntity<TKey>.Id

framework/src/Volo.Abp.Ddd.Application/Volo/Abp/Application/Services/CrudAppService.cs

@@ -289,7 +289,11 @@ namespace Volo.Abp.Application.Services
                 return;
             }
 
-            entityWithGuidId.Id = GuidGenerator.Create();
+            EntityHelper.TrySetId(
+                entityWithGuidId,
+                () => GuidGenerator.Create(),
+                true
+            );
         }
 
         /// <summary>

framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Entities/DisableIdGenerationAttribute.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace Volo.Abp.Domain.Entities
+{
+    public class DisableIdGenerationAttribute : Attribute
+    {
+
+    }
+}

framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Entities/EntityHelper.cs

@@ -81,5 +81,32 @@ namespace Volo.Abp.Domain.Entities
             var lambdaBody = Expression.Equal(leftExpression, rightExpression);
             return Expression.Lambda<Func<TEntity, bool>>(lambdaBody, lambdaParam);
         }
+
+        public static void TrySetId<TKey>(
+            IEntity<TKey> entity, 
+            Func<TKey> idFactory, 
+            bool checkForDisableGuidGenerationAttribute = false)
+        {
+            //TODO: Can be optimized (by caching per entity type)?
+            var entityType = entity.GetType();
+            var idProperty = entityType.GetProperty(
+                nameof(entity.Id)
+            );
+
+            if (idProperty == null)
+            {
+                return;
+            }
+
+            if (checkForDisableGuidGenerationAttribute)
+            {
+                if (idProperty.IsDefined(typeof(DisableIdGenerationAttribute), true))
+                {
+                    return;
+                }
+            }
+
+            idProperty.SetValue(entity, idFactory());
+        }
     }
 }

framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Entities/IEntity.cs

@@ -22,6 +22,6 @@
         /// <summary>
         /// Unique identifier for this entity.
         /// </summary>
-        TKey Id { get; set; }
+        TKey Id { get; }
     }
 }

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/AbpDbContext.cs

@@ -281,20 +281,37 @@ namespace Volo.Abp.EntityFrameworkCore
 
         protected virtual void CheckAndSetId(EntityEntry entry)
         {
-            //Set GUID Ids
-            var entity = entry.Entity as IEntity<Guid>;
-            if (entity != null && entity.Id == Guid.Empty)
+            if (entry.Entity is IEntity<Guid> entityWithGuidId)
             {
-                var dbGeneratedAttr = ReflectionHelper
-                    .GetSingleAttributeOrDefault<DatabaseGeneratedAttribute>(
-                        entry.Property("Id").Metadata.PropertyInfo
-                    );
+                TrySetGuidId(entry, entityWithGuidId);
+            }
+        }
 
-                if (dbGeneratedAttr == null || dbGeneratedAttr.DatabaseGeneratedOption == DatabaseGeneratedOption.None)
-                {
-                    entity.Id = GuidGenerator.Create();
-                }
+        protected virtual void TrySetGuidId(EntityEntry entry, IEntity<Guid> entity)
+        {
+            if (entity.Id != default)
+            {
+                return;
             }
+
+            var idProperty = entry.Property("Id").Metadata.PropertyInfo;
+
+            //Check for DatabaseGeneratedAttribute
+            var dbGeneratedAttr = ReflectionHelper
+                .GetSingleAttributeOrDefault<DatabaseGeneratedAttribute>(
+                    idProperty
+                );
+
+            if (dbGeneratedAttr != null && dbGeneratedAttr.DatabaseGeneratedOption != DatabaseGeneratedOption.None)
+            {
+                return;
+            }
+
+            EntityHelper.TrySetId(
+                entity,
+                () => GuidGenerator.Create(),
+                true
+            );
         }
 
         protected virtual void SetCreationAuditProperties(EntityEntry entry)

framework/src/Volo.Abp.MemoryDb/Volo/Abp/Domain/Repositories/MemoryDb/MemoryDbRepository.cs

@@ -75,11 +75,13 @@ namespace Volo.Abp.Domain.Repositories.MemoryDb
 
         protected virtual void SetIdIfNeeded(TEntity entity)
         {
-            if (typeof(TKey) == typeof(int) || typeof(TKey) == typeof(long) || typeof(TKey) == typeof(Guid))
+            if (typeof(TKey) == typeof(int) || 
+                typeof(TKey) == typeof(long) || 
+                typeof(TKey) == typeof(Guid))
             {
                 if (EntityHelper.HasDefaultId(entity))
                 {
-                    entity.Id = Database.GenerateNextId<TEntity, TKey>();
+                    EntityHelper.TrySetId(entity, () => Database.GenerateNextId<TEntity, TKey>());
                 }
             }
         }

framework/src/Volo.Abp.MongoDB/Volo/Abp/Domain/Repositories/MongoDB/MongoDbRepository.cs

@@ -15,6 +15,7 @@ using Volo.Abp.EventBus.Local;
 using Volo.Abp.Guids;
 using Volo.Abp.MongoDB;
 using Volo.Abp.MultiTenancy;
+using Volo.Abp.Reflection;
 using Volo.Abp.Threading;
 
 namespace Volo.Abp.Domain.Repositories.MongoDB
@@ -315,12 +316,26 @@ namespace Volo.Abp.Domain.Repositories.MongoDB
 
         protected virtual void CheckAndSetId(TEntity entity)
         {
-            if (entity is IEntity<Guid> entityWithGuidId && entityWithGuidId.Id == default)
+            if (entity is IEntity<Guid> entityWithGuidId)
             {
-                entityWithGuidId.Id = GuidGenerator.Create();
+                TrySetGuidId(entityWithGuidId);
             }
         }
 
+        protected virtual void TrySetGuidId(IEntity<Guid> entity)
+        {
+            if (entity.Id != default)
+            {
+                return;
+            }
+
+            EntityHelper.TrySetId(
+                entity,
+                () => GuidGenerator.Create(),
+                true
+            );
+        }
+
         protected virtual void SetCreationAuditProperties(TEntity entity)
         {
             AuditPropertySetter.SetCreationProperties(entity);

framework/test/Volo.Abp.Ddd.Tests/Volo/Abp/Domain/Entities/EntityHelper_Tests.cs

@@ -0,0 +1,57 @@
+using System;
+using Shouldly;
+using Xunit;
+
+namespace Volo.Abp.Domain.Entities
+{
+    public class EntityHelper_Tests
+    {
+        [Fact]
+        public static void SetId_DerivedFromAggregateRoot()
+        {
+            var idValue = Guid.NewGuid();
+            var myEntityDerivedFromAggregateRoot = new MyEntityDerivedFromAggregateRoot();
+            EntityHelper.TrySetId(myEntityDerivedFromAggregateRoot, () => idValue, true);
+            myEntityDerivedFromAggregateRoot.Id.ShouldBe(idValue);
+        }
+
+        [Fact]
+        public static void SetId_ImplementsIEntity()
+        {
+            var idValue = Guid.NewGuid();
+            var myEntityImplementsIEntity = new MyEntityImplementsIEntity();
+            EntityHelper.TrySetId(myEntityImplementsIEntity, () => idValue, true);
+            myEntityImplementsIEntity.Id.ShouldBe(idValue);
+        }
+
+        [Fact]
+        public static void SetId_DisablesIdGeneration()
+        {
+            var idValue = Guid.NewGuid();
+            var myEntityDisablesIdGeneration = new MyEntityDisablesIdGeneration();
+            EntityHelper.TrySetId(myEntityDisablesIdGeneration, () => idValue, true);
+            myEntityDisablesIdGeneration.Id.ShouldBe(default);
+        }
+
+        private class MyEntityDerivedFromAggregateRoot : AggregateRoot<Guid>
+        {
+
+        }
+
+        private class MyEntityImplementsIEntity : IEntity<Guid>
+        {
+            public Guid Id { get; set; }
+
+            public object[] GetKeys()
+            {
+                return new object[] { Id };
+            }
+        }
+
+        private class MyEntityDisablesIdGeneration : Entity<Guid>
+        {
+            [DisableIdGeneration]
+            public override Guid Id { get; set; }
+        }
+    }
+}