Null returned value

oracle/clause_builder.go

@@ -165,7 +165,7 @@ func ReturningClauseBuilder(c clause.Clause, builder clause.Builder) {
 					var dest interface{}
 					if stmt.Schema != nil {
 						if field := findFieldByDBName(stmt.Schema, column.Name); field != nil {
-							dest = createTypedDestination(field.FieldType)
+							dest = createTypedDestination(field)
 						} else {
 							dest = new(string) // Default to string for unknown fields
 						}

oracle/common.go

@@ -100,18 +100,30 @@ func findFieldByDBName(schema *schema.Schema, dbName string) *schema.Field {
 }
 
 // Create typed destination for OUT parameters
-func createTypedDestination(fieldType reflect.Type) interface{} {
-	// Handle pointer types
-	if fieldType.Kind() == reflect.Ptr {
-		fieldType = fieldType.Elem()
+func createTypedDestination(f *schema.Field) interface{} {
+	if f == nil {
+		var s string
+		return &s
 	}
 
-	// Type-safe handling for known GORM types and SQL null types
-	switch fieldType {
-	case reflect.TypeOf(gorm.DeletedAt{}):
+	ft := f.FieldType
+	for ft.Kind() == reflect.Ptr {
+		ft = ft.Elem()
+	}
+
+	if ft == reflect.TypeOf(gorm.DeletedAt{}) {
 		return new(sql.NullTime)
-	case reflect.TypeOf(time.Time{}):
+	}
+	if ft == reflect.TypeOf(time.Time{}) {
+		if !f.NotNull { // nullable column => keep NULLs
+			return new(sql.NullTime)
+		}
 		return new(time.Time)
+	}
+
+	switch ft {
+	case reflect.TypeOf(sql.NullTime{}):
+		return new(sql.NullTime)
 	case reflect.TypeOf(sql.NullInt64{}):
 		return new(sql.NullInt64)
 	case reflect.TypeOf(sql.NullInt32{}):
@@ -120,33 +132,28 @@ func createTypedDestination(fieldType reflect.Type) interface{} {
 		return new(sql.NullFloat64)
 	case reflect.TypeOf(sql.NullBool{}):
 		return new(sql.NullBool)
-	case reflect.TypeOf(sql.NullTime{}):
-		return new(sql.NullTime)
 	}
 
-	// Handle primitive types by Kind
-	switch fieldType.Kind() {
+	switch ft.Kind() {
+	case reflect.String:
+		return new(string)
+
+	case reflect.Bool:
+		return new(int64)
+
 	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		return new(int64) // Oracle returns NUMBER as int64
-	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return new(int64)
+
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
 		return new(uint64)
+
 	case reflect.Float32, reflect.Float64:
-		return new(float64) // Oracle returns FLOAT as float64
-	case reflect.Bool:
-		return new(int64) // Oracle NUMBER(1) for boolean
-	case reflect.String:
-		return new(string)
-	case reflect.Struct:
-		// For time.Time specifically
-		if fieldType == reflect.TypeOf(time.Time{}) {
-			return new(time.Time)
-		}
-		// For other structs, use string as safe fallback
-		return new(string)
-	default:
-		// For unknown types, use string as safe fallback
-		return new(string)
+		return new(float64)
 	}
+
+	// Fallback
+	var s string
+	return &s
 }
 
 // Convert values for Oracle-specific types
@@ -182,7 +189,7 @@ func convertValue(val interface{}) interface{} {
 
 // Convert Oracle values back to Go types
 func convertFromOracleToField(value interface{}, field *schema.Field) interface{} {
-	if value == nil {
+	if value == nil || field == nil {
 		return nil
 	}
 
@@ -194,7 +201,6 @@ func convertFromOracleToField(value interface{}, field *schema.Field) interface{
 
 	var converted interface{}
 
-	// Handle special types first using type-safe comparisons
 	switch targetType {
 	case reflect.TypeOf(gorm.DeletedAt{}):
 		if nullTime, ok := value.(sql.NullTime); ok {
@@ -203,7 +209,31 @@ func convertFromOracleToField(value interface{}, field *schema.Field) interface{
 			converted = gorm.DeletedAt{}
 		}
 	case reflect.TypeOf(time.Time{}):
-		converted = value
+		switch vv := value.(type) {
+		case time.Time:
+			converted = vv
+		case sql.NullTime:
+			if vv.Valid {
+				converted = vv.Time
+			} else {
+				// DB returned NULL
+				if isPtr {
+					return nil // -> *time.Time(nil)
+				}
+				// non-pointer time.Time: represent NULL as zero time
+				return time.Time{}
+			}
+		default:
+			converted = value
+		}
+
+	case reflect.TypeOf(sql.NullTime{}):
+		if nullTime, ok := value.(sql.NullTime); ok {
+			converted = nullTime
+		} else {
+			converted = sql.NullTime{}
+		}
+
 	case reflect.TypeOf(sql.NullInt64{}):
 		if nullInt, ok := value.(sql.NullInt64); ok {
 			converted = nullInt
@@ -228,48 +258,24 @@ func convertFromOracleToField(value interface{}, field *schema.Field) interface{
 		} else {
 			converted = sql.NullBool{}
 		}
-	case reflect.TypeOf(sql.NullTime{}):
-		if nullTime, ok := value.(sql.NullTime); ok {
-			converted = nullTime
-		} else {
-			converted = sql.NullTime{}
-		}
 	default:
-		// Handle primitive types
+		// primitives and everything else
 		converted = convertPrimitiveType(value, targetType)
 	}
 
-	// Handle pointer types
-	if isPtr && converted != nil {
-		if isZeroValueForPointer(converted, targetType) {
+	// Pointer targets: nil for "zero-ish", else allocate and set.
+	if isPtr {
+		if isZeroFor(targetType, converted) {
 			return nil
 		}
 		ptr := reflect.New(targetType)
 		ptr.Elem().Set(reflect.ValueOf(converted))
-		converted = ptr.Interface()
+		return ptr.Interface()
 	}
 
 	return converted
 }
 
-// Helper function to check if a value should be treated as nil for pointer fields
-func isZeroValueForPointer(value interface{}, targetType reflect.Type) bool {
-	v := reflect.ValueOf(value)
-	if !v.IsValid() || v.Kind() != targetType.Kind() {
-		return false
-	}
-
-	switch targetType.Kind() {
-	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		return v.Int() == 0
-	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
-		return v.Uint() == 0
-	case reflect.Float32, reflect.Float64:
-		return v.Float() == 0.0
-	}
-	return false
-}
-
 // Helper function to handle primitive type conversions
 func convertPrimitiveType(value interface{}, targetType reflect.Type) interface{} {
 	switch targetType.Kind() {
@@ -442,3 +448,28 @@ func isNullValue(value interface{}) bool {
 		return false
 	}
 }
+
+func isZeroFor(t reflect.Type, v interface{}) bool {
+	if v == nil {
+		return true
+	}
+	rv := reflect.ValueOf(v)
+	if !rv.IsValid() {
+		return true
+	}
+	// exact type match?
+	if rv.Type() == t {
+		// special-case time.Time
+		if t == reflect.TypeOf(time.Time{}) {
+			return rv.Interface().(time.Time).IsZero()
+		}
+		// generic zero check
+		z := reflect.Zero(t)
+		return reflect.DeepEqual(rv.Interface(), z.Interface())
+	}
+	// If types differ (e.g., sql.NullTime), treat invalid as zero
+	if nt, ok := v.(sql.NullTime); ok {
+		return !nt.Valid
+	}
+	return false
+}

oracle/create.go

@@ -490,7 +490,7 @@ func buildBulkMergePLSQL(db *gorm.DB, createValues clause.Values, onConflictClau
 	for rowIdx := 0; rowIdx < len(createValues.Values); rowIdx++ {
 		for _, column := range allColumns {
 			if field := findFieldByDBName(schema, column); field != nil {
-				stmt.Vars = append(stmt.Vars, sql.Out{Dest: createTypedDestination(field.FieldType)})
+				stmt.Vars = append(stmt.Vars, sql.Out{Dest: createTypedDestination(field)})
 				plsqlBuilder.WriteString(fmt.Sprintf("  IF l_affected_records.COUNT > %d THEN :%d := l_affected_records(%d).", rowIdx, outParamIndex+1, rowIdx+1))
 				writeQuotedIdentifier(&plsqlBuilder, column)
 				plsqlBuilder.WriteString("; END IF;\n")
@@ -602,7 +602,7 @@ func buildBulkInsertOnlyPLSQL(db *gorm.DB, createValues clause.Values) {
 			quotedColumn := columnBuilder.String()
 
 			if field := findFieldByDBName(schema, column); field != nil {
-				stmt.Vars = append(stmt.Vars, sql.Out{Dest: createTypedDestination(field.FieldType)})
+				stmt.Vars = append(stmt.Vars, sql.Out{Dest: createTypedDestination(field)})
 				plsqlBuilder.WriteString(fmt.Sprintf("  IF l_inserted_records.COUNT > %d THEN :%d := l_inserted_records(%d).%s; END IF;\n",
 					rowIdx, outParamIndex+1, rowIdx+1, quotedColumn))
 				outParamIndex++

oracle/delete.go

@@ -278,7 +278,7 @@ func buildBulkDeletePLSQL(db *gorm.DB) {
 		for _, column := range allColumns {
 			field := findFieldByDBName(schema, column)
 			if field != nil {
-				dest := createTypedDestination(field.FieldType)
+				dest := createTypedDestination(field)
 				stmt.Vars = append(stmt.Vars, sql.Out{Dest: dest})
 
 				plsqlBuilder.WriteString(fmt.Sprintf("  IF l_deleted_records.COUNT > %d THEN\n", rowIdx))

oracle/update.go

@@ -544,7 +544,7 @@ func buildUpdatePLSQL(db *gorm.DB) {
 		for _, column := range allColumns {
 			field := findFieldByDBName(schema, column)
 			if field != nil {
-				dest := createTypedDestination(field.FieldType)
+				dest := createTypedDestination(field)
 				stmt.Vars = append(stmt.Vars, sql.Out{Dest: dest})
 			}
 		}

tests/associations_many2many_test.go

@@ -372,7 +372,6 @@ func TestSingleTableMany2ManyAssociationForSlice(t *testing.T) {
 }
 
 func TestDuplicateMany2ManyAssociation(t *testing.T) {
-	t.Skip()
 	user1 := User{Name: "TestDuplicateMany2ManyAssociation-1", Languages: []Language{
 		{Code: "TestDuplicateMany2ManyAssociation-language-1"},
 		{Code: "TestDuplicateMany2ManyAssociation-language-2"},
@@ -436,7 +435,6 @@ func TestConcurrentMany2ManyAssociation(t *testing.T) {
 }
 
 func TestMany2ManyDuplicateBelongsToAssociation(t *testing.T) {
-	t.Skip()
 	user1 := User{Name: "TestMany2ManyDuplicateBelongsToAssociation-1", Friends: []*User{
 		{Name: "TestMany2ManyDuplicateBelongsToAssociation-friend-1", Company: Company{
 			ID:   1,

tests/generics_test.go

@@ -422,7 +422,6 @@ func TestGenericsJoins(t *testing.T) {
 }
 
 func TestGenericsNestedJoins(t *testing.T) {
-	t.Skip()
 	users := []User{
 		{
 			Name: "generics-nested-joins-1",

tests/joins_test.go

@@ -383,8 +383,6 @@ func TestJoinArgsWithDB(t *testing.T) {
 }
 
 func TestNestedJoins(t *testing.T) {
-	t.Skip()
-
 	users := []User{
 		{
 			Name: "nested-joins-1",
@@ -424,7 +422,7 @@ func TestNestedJoins(t *testing.T) {
 		Joins("Manager.NamedPet.Toy").
 		Joins("NamedPet").
 		Joins("NamedPet.Toy").
-		Find(&users2, "users.id IN ?", userIDs).Error; err != nil {
+		Find(&users2, "\"users\".\"id\" IN ?", userIDs).Error; err != nil {
 		t.Fatalf("Failed to load with joins, got error: %v", err)
 	} else if len(users2) != len(users) {
 		t.Fatalf("Failed to load join users, got: %v, expect: %v", len(users2), len(users))

tests/passed-tests.txt

@@ -21,9 +21,9 @@ TestMany2ManyOmitAssociations
 TestMany2ManyAssociationForSlice
 #TestSingleTableMany2ManyAssociation
 #TestSingleTableMany2ManyAssociationForSlice
-#TestDuplicateMany2ManyAssociation
+TestDuplicateMany2ManyAssociation
 TestConcurrentMany2ManyAssociation
-#TestMany2ManyDuplicateBelongsToAssociation
+TestMany2ManyDuplicateBelongsToAssociation
 TestInvalidAssociation
 TestAssociationNotNullClear
 #TestForeignKeyConstraints
@@ -112,7 +112,7 @@ TestGenericsDelete
 TestGenericsFindInBatches
 TestGenericsScopes
 #TestGenericsJoins
-#TestGenericsNestedJoins
+TestGenericsNestedJoins
 #TestGenericsPreloads
 #TestGenericsNestedPreloads
 TestGenericsDistinct
@@ -146,7 +146,7 @@ TestJoinCount
 TestInnerJoins
 TestJoinWithSameColumnName
 TestJoinArgsWithDB
-#TestNestedJoins
+TestNestedJoins
 TestJoinsPreload_Issue7013
 TestJoinsPreload_Issue7013_RelationEmpty
 TestJoinsPreload_Issue7013_NoEntries
@@ -267,7 +267,7 @@ TestSubQueryWithHaving
 TestQueryWithTableAndConditions
 TestQueryWithTableAndConditionsAndAllFields
 #TestQueryScannerWithSingleColumn
-#TestQueryResetNullValue
+TestQueryResetNullValue
 TestQueryError
 TestQueryScanToArray
 TestRownum

tests/query_test.go

@@ -1393,7 +1393,6 @@ func TestQueryScannerWithSingleColumn(t *testing.T) {
 }
 
 func TestQueryResetNullValue(t *testing.T) {
-	t.Skip()
 	type QueryResetItem struct {
 		ID   string `gorm:"type:varchar(5)"`
 		Name string