// same nested structure
					if _, ok := joinedNestedSchemaMap[fullRelsName]; !ok {
						if value := reflect.ValueOf(values[idx]).Elem(); value.Kind() == reflect.Ptr && value.IsNil() {
							isNilPtrValue = true
							break
						}

						relValue.Set(reflect.New(relValue.Type().Elem()))
						joinedNestedSchemaMap[fullRelsName] = nil
					}
				}
				currentReflectValue = relValue
			}

									gussNestedRelations = append(gussNestedRelations, relation)
									currentRelations = relation.FieldSchema.Relationships.Relations
								} else {
									isNestedJoin = false
									break
								}
							}

							if isNestedJoin {
								isRelations = true
								relations = gussNestedRelations
							}
						}
					}

					if isRelations {

				for _, dbName := range stmt.Schema.DBNames {
					var foundColumn gorm.ColumnType

					for _, columnType := range columnTypes {
						if columnType.Name() == dbName {
							foundColumn = columnType
							break
						}
					}

					if foundColumn == nil {
						// not found, add column
						if err = execTx.Migrator().AddColumn(value, dbName); err != nil {
							return err
						}
					} else {

					identityMap := map[string]bool{}
					for i := 0; i < rValLen; i++ {
						obj := db.Statement.ReflectValue.Index(i)
						if reflect.Indirect(obj).Kind() != reflect.Struct {
							break
						}
						if _, zero := rel.Field.ValueOf(db.Statement.Context, obj); !zero { // check belongs to relation value
							rv := rel.Field.ReflectValueOf(db.Statement.Context, obj) // relation reflect value
							if !isPtr {

			tx.AddError(result.Error)
		}

		if tx.Error != nil || int(result.RowsAffected) < batchSize {
			break
		}

		if totalSize > 0 {
			if totalSize <= int(rowsAffected) {
				break
			}
			if totalSize/batchSize == batch {
				batchSize = totalSize % batchSize
			}
		}

		// Optimize for-break
		resultsValue := reflect.Indirect(reflect.ValueOf(dest))

				if config.LastInsertIDReversed {
					for i := db.Statement.ReflectValue.Len() - 1; i >= 0; i-- {
						rv := db.Statement.ReflectValue.Index(i)
						if reflect.Indirect(rv).Kind() != reflect.Struct {
							break
						}

						_, isZero := pkField.ValueOf(db.Statement.Context, rv)
						if isZero {
							db.AddError(pkField.Set(db.Statement.Context, rv, insertID))
							insertID -= pkField.AutoIncrementIncrement

										conds = append(conds, clause.Eq{Column: clause.Column{Table: clause.CurrentTable, Name: field.Name}, Value: v})
									}
								}
							}
						}
					}
				}

				if restricted {
					break
				}
			} else if !reflectValue.IsValid() {
				stmt.AddError(ErrInvalidData)
			} else if len(conds) == 0 {
				if len(args) == 1 {
					switch reflectValue.Kind() {
					case reflect.Slice, reflect.Array:

									association.Error = err
									break
								}
							}
						}
					}
				}
				break
			}

			association.Error = ErrInvalidValueOfLength
			return
		}

		for i := 0; i < reflectValue.Len(); i++ {

			// If there are multiple primary keys, the AUTOINCREMENT field is prioritized
			for _, field := range schema.PrimaryFields {
				if field.AutoIncrement {
					schema.PrioritizedPrimaryField = field
					break
				}
			}
		}
	}

	for _, field := range schema.PrimaryFields {
		schema.PrimaryFieldDBNames = append(schema.PrimaryFieldDBNames, field.DBName)
	}

	for _, field := range schema.Fields {