如何在 console.log 中使用 Mongoose 檢查 MongoDB 中插入的文檔數量

Question

我剛開始學習如何使用 MongoDB 和 Mongoose，所以我嘗試在 MongoDB 中插入一些文檔在本地運行，這就是我只使用 MongoDB 時的做法

const { MongoClient } = require("mongodb");
   const uri = "mongodb://localhost:27017";
   const client = new MongoClient(uri);

   async function run() {
     const dbName = client.db("fruitsDB");
 
     try {
       await client.connect();
       
       // I insert the function to insert the docs here
       await insertMultiDocs(dbName, docs);
    
       // Establish and verify connection
       await client.db("admin").command({ ping: 1 });
       console.log("Connected successfully to server");
     } finally {
       await client.close();
    }
   }
   run().catch(console.dir);

   // below is the docs I want to insert and the function I use like the MongoDB's
   // documentation.
   const docs = [
       { name: "Ananas", rating: 7, review: "nice fruit"},
       { name: "Prune", rating: 8, review: "Kinda good"},
       { name: "Peach", rating: 7, review: "taste great"},
       { name: "Strawberry", rating: 9, review: "great fruit"}
   ];

   async function insertMultiDocs (client, newList) {
     try {
       const insertManyresult = await client.collection("fruits").insertMany(newList);
       let ids = insertManyresult.insertedIds;
       console.log(`${insertManyresult.insertedCount} documents were inserted.`);
       for (let id of Object.values(ids)) {
       console.log(`Inserted a document with id ${id}`);
       }
     } catch(e) {
       console.log(`A MongoBulkWriteException occurred, but there are successfully processed documents.`); 
       let ids = e.result.result.insertedIds;
       for (let id of Object.values(ids)) {
        console.log(`Processed a document with id ${id._id}`);
       }
      console.log(`Number of documents inserted: ${e.result.result.nInserted}`);
     }
   }

然后我得到這個console.log：

4 documents were inserted.
Inserted a document with id 63051aeb6b883a87e46ea895
Inserted a document with id 63051aeb6b883a87e46ea896
Inserted a document with id 63051aeb6b883a87e46ea897
Inserted a document with id 63051aeb6b883a87e46ea898
Connected successfully to server

現在我想嘗試對 ZCCADCDEDB567ABAE643E15DCF0974E503Z 做同樣的事情：

const mongoose = require("mongoose");
const { Schema } = mongoose;

main().catch(err => console.log(err));

async function main() {

  try {
    await mongoose.connect("mongodb://localhost:27017/fruitsDB");
    
    const fruitSchema = new Schema({
      name : String,
      rating : Number,
      review : String
    });

    const Fruit = mongoose.model("Fruit", fruitSchema);
    
    // I insert the docs here...
    Fruit.insertMany(docs)
    
  } catch (error) {
    console.log(error);
  }
}

它可以工作，但是有沒有辦法在 Mongoose 中實現 console.log 並像在 MongoDB 驅動器上那樣循環插入每個文檔？

Answer 1

insertMany返回在驗證后添加到數據庫的文檔（如果設置了任何驗證）。

你可以在它上面加上.length來得到這樣的值

const insertManyresult = await Fruit.insertMany(docs);

console.log(`${insertManyresult.length} documents were inserted.`);

因為您可以訪問所有文件。 您可以執行任何選擇的操作（循環遍歷每個文檔、獲取長度等）

在此處閱讀有關insertMany的更多信息。