Mongoose model 导出时变为未定义

Question

我从此文件导出 model DemandeTransports：

//@/components/database/model/Schema.js
import { Schema } from "mongoose";
import mongoose from "mongoose";

const userSchema = new Schema({
  email: { type: String, index: true, unique: true, required: true },
  password: { type: String, required: true },
  role: { type: String, required: true },
  infos: Map,
});

const Users = mongoose.models?.user || new mongoose.model("user", userSchema);

const demandeTransportSchema = new Schema({
  date: { type: Date, required: true },
  user: { type: Object, required: true },
  values: { type: Object, required: true },
});

const DemandeTransports =
  mongoose.models?.demandeTransport ||
  new mongoose.model("demandeTransport", demandeTransportSchema);

console.log(DemandeTransports.findOne);
export { Users, DemandeTransports };

哪个日志（在服务器上）：[功能：findOne]

但是当我尝试在此文件中导入 model 时：

//@/lib/getAllDemandesFromUser.js
import connectMongo from "@/components/database/conn";
import { DemandeTransports } from "@/components/database/model/Schema";

export default function getAllDemandesFromUser(email) {
  console.log("JSON.stringify(DemandeTransports)");
  console.log(JSON.stringify(DemandeTransports));
  connectMongo().catch((error) =>
    res.status(500).json({
      error: "La connection à la bdd mongo a échoué avec l'erreur : " + error,
    })
  );
  const result = DemandeTransports.findOne({ "user.email": email });
  return result;
}

我收到 TypeError: components_database_model_Schema__WEBPACK_IMPORTED_MODULE_1 _.DemandeTransports.findOne is not a function

DemandeTransports 被记录为未定义，我不明白为什么。

Answer 1

我刚刚明白：我的基本错误是我在客户端尝试连接到 mongodb，这是不可能的。 我将所有呼叫转移到 getServerSideProps function 中的数据库：

export async function getServerSideProps(context) {
  const session = await unstable_getServerSession(
    context.req,
    context.res,
    authOptions
  );
  // Fetch data from external API
  connectMongo().catch((error) =>
    console.log("Erreur lors de la connection à la bdd : " + error)
  );
  const result = await DemandeTransports.findOne({
    "user.email": session.user.email,
  });

  const result2 = result.toObject();
  console.log(result.toObject());
  // Pass data to the page via props
  return { props: { result2 } };
}

现在它工作得很好。