node.js - typeORM 未发现数据库架构更改 - 无法生成迁移。要创建新的空迁移，请使用 "typeorm migration:create"命令

Question

我正在做一门类(class)，我们使用 express-node postgres 和 react(使用 typescript)和 typeORM。到目前为止一切都运行良好，但我面临 typeORM 的问题，我不知道发生了什么以及为什么会发生此错误
大问题 : 所以，问题是，我在做身份验证，在某个时候我们改变了数据库中的用户架构，所以我们不得不进行迁移，但是，在迁移之前，我们做了 npm run typeorm schema:drop ，但是当我尝试时，这发生在迁移中
这是我使用的第一个命令

npm run typeorm migration:generate -- --n create-users-table

这是错误

> new-typeorm-project@0.0.1 typeorm C:\Users\diego cifuentes\Desktop\Studying  Backend\redit> ts-node ./node_modules/typeorm/cli.js "migration:generate" "create-users-table"

bin.js migration:generate

Generates a new migration file with sql needs to be executed to update
schema.

Opciones:
  -h, --help          Muestra ayuda                             [booleano]  -c, --connection    Name of the connection on which run a query.
                                                      [defecto: "default"]  -n, --name          Name of the migration class.
                                        [cadena de caracteres] [requerido]  -d, --dir           Directory where migration should be created.
  -p, --pretty        Pretty-print generated SQL
                                               [booleano] [defecto: false]  -f, --config        Name of the file with connection configuration.
                                                    [defecto: "ormconfig"]  -o, --outputJs      Generate a migration file on Javascript instead of
                      Typescript               [booleano] [defecto: false]      --dr, --dryrun  Prints out the contents of the migration instead of
                      writing it to a file     [booleano] [defecto: false]      --ch, --check   Verifies that the current database is up to date and                      that no migrations are needed. Otherwise exits with
                      code 1.                  [booleano] [defecto: false]  -v, --version       Muestra número de versión                 [booleano]
Falta argumento requerido: n
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! new-typeorm-project@0.0.1 typeorm: `ts-node ./node_modules/typeorm/cli.js "migration:generate" "create-users-table"`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the new-typeorm-project@0.0.1 typeorm script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\diego cifuentes\AppData\Roaming\npm-cache\_logs\2021-05-11T15_29_02_081Z-debug.log

经过几个小时试图到处寻找解决方案后，我将最后一个命令更改为这个命令

npx typeorm migration:generate -- --n create-users-table

这次的错误不同，看起来像这样

No changes in database schema were found - cannot generate a migration. To create a new empty migration use "typeorm migration:create" command

所以，我说，好吧，我离解决这个问题越来越近了，但是......几个小时后(再次)寻找新的答案，我找不到任何东西，所以，我到了我需要的地步写这篇文章是为了解决我的问题。现在，让我向您展示我的 ormconfig、我的 package.json 和我想在我的 postgres 数据库中迁移的实体。
package.json(脚本 typeorm 在最后)

{
  "name": "new-typeorm-project",
  "version": "0.0.1",
  "description": "Awesome project developed with TypeORM.",
  "devDependencies": {
    "@types/bcrypt": "^5.0.0",
    "@types/cookie": "^0.4.0",
    "@types/cookie-parser": "^1.4.2",
    "@types/express": "^4.17.11",
    "@types/jsonwebtoken": "^8.5.1",
    "@types/morgan": "^1.9.2",
    "@types/node": "^15.0.2",
    "morgan": "^1.10.0",
    "nodemon": "^2.0.7",
    "ts-node": "^9.1.1",
    "typescript": "^4.2.4"
  },
  "dependencies": {
    "bcrypt": "^5.0.1",
    "class-transformer": "^0.4.0",
    "class-validator": "^0.13.1",
    "cookie": "^0.4.1",
    "cookie-parser": "^1.4.5",
    "dotenv": "^9.0.1",
    "express": "^4.17.1",
    "jsonwebtoken": "^8.5.1",
    "pg": "^8.4.0",
    "reflect-metadata": "^0.1.10",
    "typeorm": "0.2.32"
  },
  "scripts": {
    "start": "ts-node src/server.ts",
    "dev": "nodemon --exec ts-node src/server.ts",
    "typeorm": "ts-node ./node_modules/typeorm/cli.js"
  }
}

ormconfing.json 速记 :我将实体、迁移和订阅者更改为 .js，因为 .ts 总是给我错误。

{
  "type": "postgres",
  "host": "localhost",
  "port": 5432,
  "username": "**",
  "password": "**",
  "database": "**",
  "synchronize": true,
  "logging": true,
  "entities": ["src/entities/**/*.js"],
  "migrations": ["src/migrations/**/*.js"],
  "subscribers": ["src/subscribers/**/*.js"],
  "cli": {
    "entitiesDir": "src/entities",
    "migrationsDir": "src/migrations",
    "subscribersDir": "src/subscribers"
  }
}

我想向您展示的最后一件事，即使它可能不那么重要，这就是用户模式

import {
  Entity as TOEntity,
  Column,
  Index,
  BeforeInsert,
  OneToMany
} from "typeorm";
import bcrypt from "bcrypt";
import { IsEmail, Length } from "class-validator";
import { Exclude } from "class-transformer";

import Entity from "./Entity";
// import Post from "./Post";

@TOEntity("users")
export default class User extends Entity {
  constructor(user: Partial<User>) {
    super();
    Object.assign(this, user);
  }

  @Index()
  @IsEmail()
  @Column({ unique: true })
  email: string;

  @Index()
  @Length(3, 200)
  @Column({ unique: true })
  username: string;

  @Exclude()
  @Length(6, 200)
  @Column()
  password: string;

  // @OneToMany(() => Post, post => post.user)
  // posts: Post[];

  @BeforeInsert()
  async hashedPassword() {
    this.password = await bcrypt.hash(this.password, 6);
  }
}

最终目标 : 所以，如果你能帮我解决这个问题，你就能救我一命。最后一件事是我试图首先在堆栈溢出的西类牙语网站上发布我的问题，但没有人可以帮助我，所以也许这里有人会，感谢您的时间并保重!

Answer 1

更改您的 entities , migrations和 subscribers进入您的 dist目录。
例如。:

  entities: ["dist/entities/**/*{.js,.ts}"],
  migrations: ["dist/migrations/**/*{.js,.ts}"],
  subscribers: ["dist/subscribers/**/*{.js,.ts}"],

dist directory 是构建应用程序时创建的目录。您可以找到您的 dist目录使用 tsconfig.json -> compilerOptions -> outDir .
然后使用 npm run build 再次构建您的应用程序并尝试生成迁移。