PurchaseLogsModel.find（）以猫鼬返回空白

Question

  
  let Schema = mongoose.Schema

  let purchaseLogsSchema = new Schema({
    name: { type: String }, // user name
    email: { type: String },
    key: { type: String },
  })
  
  return mongoose.model('PurchaseLog', purchaseLogsSchema, 'purchaselog')
  
  
  /// then in my controller
   const data = await global.db.PurchaseLogsModel.find({ key: key }).sort({ createdAt: -1 }).limit(500)

但是数据总是空数组，我已经尝试了很多解决方案：