nodejs mongoose -如何在登录前检查数据库中的项目

const mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => {
    console.log('Connected to MongoDB');
  })
  .catch((error) => {
    console.error('Failed to connect to MongoDB', error);
  });

const projectSchema = new mongoose.Schema({
  name: String,
  description: String,
  // 其他字段...
});

const Project = mongoose.model('Project', projectSchema);

const projectName = 'My Project';

Project.findOne({ name: projectName })
  .then((project) => {
    if (project) {
      console.log('Project exists');
      // 执行登录操作...
    } else {
      console.log('Project does not exist');
      // 执行其他操作...
    }
  })
  .catch((error) => {
    console.error('Failed to check project', error);
  });