This attempts to address a concern in issues #202 and #192.

This patch provides a new method UpdateAll() that will update all fields. It doesn not ignore initialized values...

.gitignore

@@ -0,0 +1 @@
+gorm.test

callback_update.go

@@ -7,7 +7,7 @@ import (
 
 func AssignUpdateAttributes(scope *Scope) {
 	if attrs, ok := scope.InstanceGet("gorm:update_interface"); ok {
-		if maps := convertInterfaceToMap(attrs); len(maps) > 0 {
+		if maps := convertInterfaceToMap(attrs, false); len(maps) > 0 {
 			protected, ok := scope.Get("gorm:ignore_protected_attrs")
 			_, updateColumn := scope.Get("gorm:update_column")
 			updateAttrs, hasUpdate := scope.updatedAttrsWithValues(maps, ok && protected.(bool))

main.go

@@ -200,7 +200,7 @@ func (s *DB) FirstOrInit(out interface{}, where ...interface{}) *DB {
 		}
 		c.NewScope(out).inlineCondition(where...).initialize()
 	} else {
-		c.NewScope(out).updatedAttrsWithValues(convertInterfaceToMap(s.search.AssignAttrs), false)
+		c.NewScope(out).updatedAttrsWithValues(convertInterfaceToMap(s.search.AssignAttrs, false), false)
 	}
 	return c
 }
@@ -223,6 +223,12 @@ func (s *DB) Update(attrs ...interface{}) *DB {
 	return s.Updates(toSearchableMap(attrs...), true)
 }
 
+func (s *DB) UpdateAll(value interface{}) *DB {
+	return s.clone().NewScope(value).
+		InstanceSet("gorm:update_interface", convertInterfaceToMap(value, true)).
+		callCallbacks(s.parent.callback.updates).db
+}
+
 func (s *DB) Updates(values interface{}, ignoreProtectedAttrs ...bool) *DB {
 	return s.clone().NewScope(s.Value).
 		Set("gorm:ignore_protected_attrs", len(ignoreProtectedAttrs) > 0).

scope_private.go

@@ -375,10 +375,10 @@ func (scope *Scope) rows() (*sql.Rows, error) {
 
 func (scope *Scope) initialize() *Scope {
 	for _, clause := range scope.Search.WhereConditions {
-		scope.updatedAttrsWithValues(convertInterfaceToMap(clause["query"]), false)
+		scope.updatedAttrsWithValues(convertInterfaceToMap(clause["query"], false), false)
 	}
-	scope.updatedAttrsWithValues(convertInterfaceToMap(scope.Search.InitAttrs), false)
+	scope.updatedAttrsWithValues(convertInterfaceToMap(scope.Search.InitAttrs, false), false)
-	scope.updatedAttrsWithValues(convertInterfaceToMap(scope.Search.AssignAttrs), false)
+	scope.updatedAttrsWithValues(convertInterfaceToMap(scope.Search.AssignAttrs, false), false)
 	return scope
 }
 

update_test.go

@@ -158,3 +158,44 @@ func TestUpdateColumn(t *testing.T) {
 		t.Errorf("updatedAt should not be updated with update column")
 	}
 }
+
+func TestAlwaysUpdate(t *testing.T) {
+	type Always struct {
+		Id       int64
+		Name     string
+		Code     string
+		Price    int64
+		IsActive bool
+	}
+
+	DB.DropTable(&Always{})
+	DB.CreateTable(&Always{})
+
+	obj1 := Always{Name: "obj1", Code: "code_1", Price: 10, IsActive: true}
+	obj2 := Always{Name: "obj2", Code: "code_2", Price: 20, IsActive: true}
+	obj3 := Always{Name: "obj3", Code: "code_10", Price: 100, IsActive: true}
+
+	// save initial
+	DB.Save(&obj1).Save(&obj2).Save(&obj3)
+
+	// now update via struct price should change to zero
+	obj2.Price = 0
+	DB.UpdateAll(obj2)
+
+	var obj2_1 Always
+	DB.First(&obj2_1, obj2.Id)
+	if obj2_1.Price != 0 {
+		t.Errorf("UpdateAll did not update Price for obj2: %#v", obj2_1)
+	}
+
+	// test bool
+	obj3.IsActive = false
+	DB.UpdateAll(obj3)
+
+	var obj3_1 Always
+	DB.First(&obj3_1, obj3.Id)
+	if obj3_1.IsActive {
+		t.Errorf("UpdateAll did not update IsActive for obj3: %#v", obj3_1)
+	}
+
+}

utils_private.go

@@ -40,7 +40,7 @@ func toSearchableMap(attrs ...interface{}) (result interface{}) {
 	return
 }
 
-func convertInterfaceToMap(values interface{}) map[string]interface{} {
+func convertInterfaceToMap(values interface{}, skipBlankCheck bool) map[string]interface{} {
 	attrs := map[string]interface{}{}
 
 	switch value := values.(type) {
@@ -50,7 +50,7 @@ func convertInterfaceToMap(values interface{}) map[string]interface{} {
 		}
 	case []interface{}:
 		for _, v := range value {
-			for key, value := range convertInterfaceToMap(v) {
+			for key, value := range convertInterfaceToMap(v, skipBlankCheck) {
 				attrs[key] = value
 			}
 		}
@@ -65,7 +65,7 @@ func convertInterfaceToMap(values interface{}) map[string]interface{} {
 		default:
 			scope := Scope{Value: values}
 			for _, field := range scope.Fields() {
-				if !field.IsBlank {
+				if skipBlankCheck || !field.IsBlank {
 					attrs[field.DBName] = field.Field.Interface()
 				}
 			}