EntityMetadataNotFoundError: No metadata for x was found.

The following solution works. Modify the files as shown below

tasks.repository.ts

import { Injectable } from '@nestjs/common';
import { DataSource, Repository } from 'typeorm';
import { CreateTaskDto } from './create-task.dto';
import { TaskStatus } from './task-status.enum';
import { Task } from './task.entity';

@Injectable()
export class TaskRepository extends Repository<Task> {
  constructor(private dataSource: DataSource) {
    super(Task, dataSource.createEntityManager());
  }

  async createTask({ title, description }: CreateTaskDto): Promise<Task> {
    const task = this.create({
      title,
      description,
      status: TaskStatus.OPEN,
    });

    await this.save(task);
    return task;
  }
}

tasks.module.ts

import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { Task } from './task.entity';
import { TasksController } from './tasks.controller';
import { TaskRepository } from './tasks.repository';
import { TasksService } from './tasks.service';

@Module({
  imports: [TypeOrmModule.forFeature([Task])],
  controllers: [TasksController],
  providers: [TasksService, TaskRepository],
})
export class TasksModule {}

tasks.service.ts

import { Injectable, NotFoundException } from '@nestjs/common';
import { TaskStatus } from './task-status.enum';
import { CreateTaskDto } from './create-task.dto';
import { GetTaskFilterDto } from './get-task-filter.dto';
import { TaskRepository } from './tasks.repository';
import { InjectRepository } from '@nestjs/typeorm';
import { Task } from './task.entity';

@Injectable()
export class TasksService {
  constructor(private readonly tasksRepository: TaskRepository) {}

  async getTaskById(id: string): Promise<Task> {
    const record = this.tasksRepository.findOne({ where: { id } });
    if (!record) {
      throw new NotFoundException();
    }
    return record;
  }

  createTask(createTaskDto: CreateTaskDto): Promise<Task> {
    return this.tasksRepository.createTask(createTaskDto);
  }
}

I’m seeing the same error, but it’s frustrating since it only happens when trying to write to a remote MySQL database that has the exact same schema as my local MySQL database:

NotFoundException: No metadata for "Role" was found.
    at /home/dan/Disk/Development/maa-ml-esg-monorepo/modules/api/src/auth/role/role.service.ts:74:28
    at processTicksAndRejections (node:internal/process/task_queues:95:5)

Role is already present in my entites array so I don’t know what’s going on…

Edit: It turns out I was getting this error since the write operation was happening on startup, and I wasn’t awaiting for my datasources to initialize. Adding await fixed it:

await ReadDataSource.initialize();
await WriteDataSource.initialize();