如何使用 Nest.js 动态连接到 MongoDB 数据库

Question

我需要为客户应用程序中的每个实体创建一个单独的数据库。我要根据到请求来自的子域。我怎样才能做到这一点并使用 nestjs 和 mongoose 动态连接到数据库？

用户服务

async findOneByEmail(email: string, subdomain: string): Promise<User | any> {
    const liveConnections = await Databases.getConnection(subdomain)

    const user = await liveConnections.model(User.name, UserSchema).find()
    // { 'securityInfo.email': email }
    if (!user)
        throw new HttpException(
            {
                status: HttpStatus.BAD_REQUEST,
                error: 'user not found',
                field: 'user',
            },
            HttpStatus.BAD_REQUEST
        )

    return user
}

我创造的

class

class DataBases extends Mongoose {
    private clientOption = {
        keepAlive: true,
        useNewUrlParser: true,
        useUnifiedTopology: true,
    }

    private databases: { [key: string]: Connection } = {}

    private getConnectionUri = (companyName = '') =>
        `mongodb+srv://${process.env.MONGODB_USERNAME}:${process.env.MONGODB_PASSWORD}@cluster0.2lukt.mongodb.net/${companyName}?retryWrites=true&w=majority`

    public async getConnection(companyName = ''): Promise<Connection> {
        const connection = this.databases[companyName]
        return connection ? connection : await this.createDataBase(companyName)
    }

    private async createDataBase(comapnyName = ''): Promise<Connection> {
        //  create new connection and if the database not exists just create new one
        const newConnection = await this.createConnection(
            this.getConnectionUri(comapnyName),
            this.clientOption
        )
        this.databases[comapnyName] = newConnection
        return newConnection
    }
}

Answer 1

我修好了。我创建的数据库 Class 非常有效，如果您知道更好的方法，请告诉我。我必须改变的是我使用 MongoDB 连接的方式。现在我可以连接到不同的数据库，具体取决于子域。

希望对大家有所帮助！

用户服务

async findOneByEmail(email: string, subdomain: string): Promise<User | any> {
    const liveConnections = await Databases.getConnection(subdomain)
    const user = await liveConnections
        .model(User.name, UserSchema)
        .findOne({ 'securityInfo.email': email })
        .exec()
    if (!user)
        throw new HttpException(
            {
                status: HttpStatus.BAD_REQUEST,
                error: 'user not found',
                field: 'user',
            },
            HttpStatus.BAD_REQUEST
        )

    return user
}

如何使用 Nest.js 动态连接到 MongoDB 数据库

How to dynamically connect to a MongoDB database using Nest.js

javascript

multi-tenant

mongodb

typescript

nestjs

用户服务

class

用户服务