postgresql - 我想用 mikro-orm 插入，但它找不到我的表 :c (TableNotFoundException)

Question

所以

控制台:

yarn dev
yarn run v1.22.10
$ nodemon dist/index.js
[nodemon] 2.0.7
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,mjs,json  
[nodemon] starting `node dist/index.js`     
[discovery] ORM entity discovery started, using ReflectMetadataProvider
[discovery] - processing entity Post
[discovery] - entity discovery finished, found 1 entities, took 21 ms
[info] MikroORM successfully connected to database postgres on postgresql://postgres:*****@127.0.0.1:5432
[query] begin
[query] insert into "post" ("created_at", "title", "updated_at") values ('2021-04-05T21:04:23.126Z', 'my first post', '2021-04-05T21:04:23.126Z') returning "_id" [took 12 ms]
[query] rollback
TableNotFoundException: insert into "post" ("created_at", "title", "updated_at") values ('2021-04-05T21:04:23.126Z', 'my first post', '2021-04-05T21:04:23.126Z') returning "_id" - relation "post" does not exist
    at PostgreSqlExceptionConverter.convertException (P:\.Projektek\lireddit-server\node_modules\@mikro-orm\postgresql\PostgreSqlExceptionConverter.js:36:24)
    at PostgreSqlDriver.convertException (P:\.Projektek\lireddit-server\node_modules\@mikro-orm\core\drivers\DatabaseDriver.js:194:54)
    at P:\.Projektek\lireddit-server\node_modules\@mikro-orm\core\drivers\DatabaseDriver.js:198:24
    at processTicksAndRejections (internal/process/task_queues.js:93:5)
    at async PostgreSqlDriver.nativeInsert (P:\.Projektek\lireddit-server\node_modules\@mikro-orm\knex\AbstractSqlDriver.js:150:21)
    at async ChangeSetPersister.persistNewEntity (P:\.Projektek\lireddit-server\node_modules\@mikro-orm\core\unit-of-work\ChangeSetPersister.js:55:21)
    at async ChangeSetPersister.executeInserts (P:\.Projektek\lireddit-server\node_modules\@mikro-orm\core\unit-of-work\ChangeSetPersister.js:24:13)
    at async UnitOfWork.commitCreateChangeSets (P:\.Projektek\lireddit-server\node_modules\@mikro-orm\core\unit-of-work\UnitOfWork.js:496:9)
    at async UnitOfWork.persistToDatabase (P:\.Projektek\lireddit-server\node_modules\@mikro-orm\core\unit-of-work\UnitOfWork.js:458:13)
    at async PostgreSqlConnection.transactional (P:\.Projektek\lireddit-server\node_modules\@mikro-orm\knex\AbstractSqlConnection.js:53:25)
    at async UnitOfWork.commit (P:\.Projektek\lireddit-server\node_modules\@mikro-orm\core\unit-of-work\UnitOfWork.js:183:17)
    at async SqlEntityManager.flush (P:\.Projektek\lireddit-server\node_modules\@mikro-orm\core\EntityManager.js:486:9)
    at async SqlEntityManager.persistAndFlush (P:\.Projektek\lireddit-server\node_modules\@mikro-orm\core\EntityManager.js:438:9)

previous error: insert into "post" ("created_at", "title", "updated_at") values ('2021-04-05T21:04:23.126Z', 'my 
first post', '2021-04-05T21:04:23.126Z') returning "_id" - relation "post" does not exist
    at Parser.parseErrorMessage (P:\.Projektek\lireddit-server\node_modules\pg-protocol\dist\parser.js:278:15)   
    at Parser.handlePacket (P:\.Projektek\lireddit-server\node_modules\pg-protocol\dist\parser.js:126:29)        
    at Parser.parse (P:\.Projektek\lireddit-server\node_modules\pg-protocol\dist\parser.js:39:38)
    at Socket.<anonymous> (P:\.Projektek\lireddit-server\node_modules\pg-protocol\dist\index.js:10:42)
    at Socket.emit (events.js:315:20)
    at Socket.EventEmitter.emit (domain.js:467:12)
    at addChunk (internal/streams/readable.js:309:12)
    at readableAddChunk (internal/streams/readable.js:284:9)
    at Socket.Readable.push (internal/streams/readable.js:223:10)
    at TCP.onStreamRead (internal/stream_base_commons.js:188:23) {
  length: 166,
  severity: 'ERROR',
  code: '42P01',
  detail: undefined,
  hint: undefined,
  position: '13',
  internalPosition: undefined,
  internalQuery: undefined,
  where: undefined,
  schema: undefined,
  table: undefined,
  column: undefined,
  dataType: undefined,
  constraint: undefined,
  file: 'd:\\pginstaller_13.auto\\postgres.windows-x64\\src\\backend\\parser\\parse_relation.c',
  line: '1376',
  routine: 'parserOpenTable'
}

Index.ts:

import { MikroORM } from "@mikro-orm/core";
import { __prod__ } from "./constants";
import { Post } from "./entities/Post";
import mikroConfig from "./mikro-orm.config";

const main = async () => {
  const orm = await MikroORM.init(mikroConfig);
  await orm.getMigrator().up;
  const post = orm.em.create(Post, { title: "my first post" });
  await orm.em.persistAndFlush(post);
};

main().catch((err) => {
  console.error(err);
});

Post.ts:

import { Entity, PrimaryKey, Property } from "@mikro-orm/core";

@Entity()
export class Post {
  @PrimaryKey()
  _id!: number;

  @Property({ type: "date" })
  createdAt = new Date();

  @Property({ type: "date", onUpdate: () => new Date() })
  updatedAt = new Date();

  @Property({ type: "text" })
  title!: string;
}

mikro-orm.config.ts:

import { __prod__ } from "./constants";
import { Post } from "./entities/Post";
import { MikroORM } from "@mikro-orm/core";
import path from "path";

export default {
  migrations: {
    path: path.join(__dirname, "./migrations"),
    pattern: /^[\w-]+\d+\.[tj]s$/,
  },
  entities: [Post],
  dbName: "postgres",
  debug: !__prod__,
  type: "postgresql",
  password: "hellothere",
} as Parameters<typeof MikroORM.init>[0];

以及我使用 npx mikro-orm migration:create 创建的迁移:

import { Migration } from '@mikro-orm/migrations';

export class Migration20210405205411 extends Migration {

  async up(): Promise<void> {
    this.addSql('create table "post" ("_id" serial primary key, "created_at" timestamptz(0) not null, "updated_at" timestamptz(0) not null, "title" text not null);');
  }

}

在那之后我将它编译成 js 顺便说一句，但我想问题出在我的代码或 idk 的某个地方请帮助我，我可以给你更多信息只是请帮助，我一直在尝试修复这个错误 5小时 :/

Btw Im doin Ben Awad's 14 hour fullstack tutorial if its matter.

Answer 1

TableNotFoundException 当您尝试在初始化表的架构(或结构)之前添加数据时发生。

像 Mosh's Answer 一样传递 --initial对我不起作用，可能是因为我在 ./mikro-orm.config.ts 中传递了用户名和密码。

我使用 Mikro-ORM 的 SchemaGenerator 来初始化表，如图所示 here在官方文档中。

---

在 index.ts 的主函数中添加要发布的数据之前添加以下行:

const generator = orm.getSchemaGenerator();
await generator.updateSchema();

index.ts 中的主要函数现在应该如下所示:

const main = async () => {
  const orm = await MikroORM.init(mikroConfig);    
  await orm.getMigrator().up;

  const generator = orm.getSchemaGenerator();
  await generator.updateSchema();

  const post = orm.em.create(Post, { title: "my first post" });
  await orm.em.persistAndFlush(post);
};

---

updateSchema 创建一个表或根据 .entities/Post.ts 更新它。这可能会在更新 Post 文件时导致问题，我在遵循 Ben 的教程时没有遇到过任何问题。虽然，我仍然建议创建 ./create-schema.ts 并在需要时运行它，如 official docs 中所示。 .