relForeignFields = append(relForeignFields, ref.PrimaryKey)
				foreignFields = append(foreignFields, ref.ForeignKey)
			}
		}

		identityMap, foreignValues = schema.GetIdentityFieldValuesMap(tx.Statement.Context, reflectValue, foreignFields)
		if len(foreignValues) == 0 {
			return nil
		}
	}

	// nested preload
	for p, pvs := range preloads {
		tx = tx.Preload(p, pvs...)
	}

				relForeignKeys = append(relForeignKeys, ref.PrimaryKey.DBName)
				foreignFields = append(foreignFields, ref.ForeignKey)
			}
		}
	}

	_, foreignValues := GetIdentityFieldValuesMap(ctx, reflectValue, foreignFields)
	column, values := ToQueryValues(table, relForeignKeys, foreignValues)

	conds = append(conds, clause.IN{Column: column, Values: values})
	return
}

func copyableDataType(str DataType) bool {