typeorm在代码中而不是模式中为created_at设置默认值

Question

我想自动填充created_at和updated_at列。

import {BaseEntity, CreateDateColumn, PrimaryGeneratedColumn, UpdateDateColumn} from "typeorm"
import {Moment} from "moment"
import {momentTransformer} from "../helpers/transformers"

export default abstract class Model extends BaseEntity {
    @PrimaryGeneratedColumn()
    id: number

    @CreateDateColumn({type: "timestamp", transformer: momentTransformer})
    created_at: Moment

    @UpdateDateColumn({type: "timestamp", transformer: momentTransformer})
    updated_at: Moment
}

如何在不更改数据库架构的情况下设置用于sql查询的默认值（当前时间）。我我希望代码设置值而不是数据库。上面的代码将导致以下查询：

INSERT INTO `someTable`(`id`, `created_at`, `updated_at`) VALUES (DEFAULT, DEFAULT, DEFAULT)