Allow customize auto increment increment

callbacks/create.go

@@ -71,7 +71,7 @@ func Create(config *Config) func(db *gorm.DB) {
 												_, isZero := db.Statement.Schema.PrioritizedPrimaryField.ValueOf(rv)
 												if isZero {
 													db.Statement.Schema.PrioritizedPrimaryField.Set(rv, insertID)
-													insertID--
+													insertID -= db.Statement.Schema.PrioritizedPrimaryField.AutoIncrementIncrement
 												}
 											}
 										} else {
@@ -83,7 +83,7 @@ func Create(config *Config) func(db *gorm.DB) {
 
 												if _, isZero := db.Statement.Schema.PrioritizedPrimaryField.ValueOf(rv); isZero {
 													db.Statement.Schema.PrioritizedPrimaryField.Set(rv, insertID)
-													insertID++
+													insertID += db.Statement.Schema.PrioritizedPrimaryField.AutoIncrementIncrement
 												}
 											}
 										}

schema/field.go

@@ -44,6 +44,7 @@ type Field struct {
 	GORMDataType           DataType
 	PrimaryKey             bool
 	AutoIncrement          bool
+	AutoIncrementIncrement int64
 	Creatable              bool
 	Updatable              bool
 	Readable               bool
@@ -86,6 +87,7 @@ func (schema *Schema) ParseField(fieldStruct reflect.StructField) *Field {
 		Tag:                    fieldStruct.Tag,
 		TagSettings:            ParseTagSetting(fieldStruct.Tag.Get("gorm"), ";"),
 		Schema:                 schema,
+		AutoIncrementIncrement: 1,
 	}
 
 	for field.IndirectFieldType.Kind() == reflect.Ptr {
@@ -149,6 +151,10 @@ func (schema *Schema) ParseField(fieldStruct reflect.StructField) *Field {
 		field.HasDefaultValue = true
 	}
 
+	if num, ok := field.TagSettings["AUTOINCREMENTINCREMENT"]; ok {
+		field.AutoIncrementIncrement, _ = strconv.ParseInt(num, 10, 64)
+	}
+
 	if v, ok := field.TagSettings["DEFAULT"]; ok {
 		field.HasDefaultValue = true
 		field.DefaultValue = v