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这是我的代码

模型.ts

    import mongoose from 'mongoose';
    
    interface CustomerAttributes {
        shopId: string;
        firstName: string;
        lastName: string;
......    }
    
    interface CustomerModel extends mongoose.Model<CustomerDoc> {
        build(attributes: CustomerAttributes): CustomerDoc;
    }
    
    
    interface CustomerDoc extends mongoose.Document {
        .....
    }
    
    const CustomerSchema = new mongoose.Schema({
       .........
    });
    
    CustomerSchema.statics.build = (attributes: CustomerAttributes) => {
        return new Customer(attributes);
    };
    
    const Customer = mongoose.model<CustomerDoc, CustomerModel>('Customer', CustomerSchema);
    
    export { Customer };

索引.ts


        import {app} from './app';

        const start = async ()=>{
            try {
                await mongoose.connect('mongodb+srv://*****:****@cluster0.hpphw.mongodb.net/test')
                console.log('Connected to MongoDB');
            }catch(err){
                console.log(err);
            }
        
            
            app.listen(3000, () => {
                console.log('Server is running on port 3000');
            });
        }
    start();

并且 app.js 文件调用每个路由。


    app.use("/api/v1/business/customer", customerRouter);
    
    
    app.all("*", async (req, res) => {
      throw new NotFoundError();
    });
    app.use(errorHandler);
    
    export { app };

我正在尝试从 mongodb 获取数据并使用 fast-csv 将数据写入 csv 文件。这是我为将数据获取为 csv 文件而编写的代码。

和 route.ts


    // get all customer data  as csv
    router.get('/export',
        currentUser,
        async (req: Request, res: Response) => {
            const customers = await Customer.find({});
    
            var ws = fs.createWriteStream("./data/data.csv");
    
            fastcsv
                .write(customers, { headers: true })
                .on("finish", () => {
                    res.send("exported");
                })
                .pipe(ws)
           
        });

    export { router as customerRouter };

在数据目录中，它创建 data.csv 文件。但是从数据库中读取的数据没有写入。我该如何解决这个问题

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