Nestjs with Mongodb native driver problem with injecting the connection - mongodb

Question

I've used Mongodb native node driver for my Nestjs project and when I run nest run command I faced this error:
Nest can't resolve dependencies of the ProjectService (?). Please make
sure that the argument DATABASE_CONNECTION at index [0] is available
in the AppModule context.
Potential solutions:
If DATABASE_CONNECTION is a provider, is it part of the current AppModule?
If DATABASE_CONNECTION is exported from a separate #Module, is that module imported within AppModule? #Module({
imports: [ /* the Module containing DATABASE_CONNECTION */ ] })
The provider for DATABASE_CONNECTION has been defined in the database module and database module has been imported in the appModule and I can't find out the problem.
src/app.module.ts
import { Module } from '#nestjs/common';
import { AppController } from './app.controller';
import { ProjectController } from './project/project.controller';
import { ProjectService } from './project/project.service';
import { DatabaseModule } from './database.module';
#Module({
imports: [DatabaseModule],
controllers: [AppController, ProjectController],
providers: [ProjectService],
})
export class AppModule {}
src/database.module.ts
import { Module } from '#nestjs/common';
import { MongoClient, Db } from 'mongodb';
#Module({
providers: [{
provide: 'DATABASE_CONNECTION',
useFactory: async (): Promise<Db> => {
try {
const client = await MongoClient.connect('mongodb://127.0.0.1:27017', {
useUnifiedTopology: true
});
return client.db('app-test');
} catch(e){
throw e;
}
}
}
],
exports:[
'DATABASE_CONNECTION'
]
})
export class DatabaseModule { }
src/project/project.service.ts
import { Inject, Injectable } from '#nestjs/common';
import { Db } from 'mongodb';
import { Project } from '../models/project.model';
#Injectable()
export class ProjectService {
constructor(
#Inject('DATABASE_CONNECTION')
private db: Db
) {
}
async getProjects(): Promise<Project[]> {
return this.db.collection('Projects').find().toArray();
}
}

Answer 1

I finally fixed the error. I removed the content of dist folder and built the project again and start it and error fixed!
I think this could be helpful https://stackoverflow.com/a/66771530/3141993 for avoiding these type of errors without removing the content of dist file manually.