[英]How to set up an Express route with parameters
我正在構建一個 MEVN 堆棧 CRUD 應用程序(Vue、Node、Express、MongoDB)。 我正在嘗試為我的應用設置以下 Express 路線...
postRoutes.get('/view/:id', async (req, res) => {
const collection = await loadPostsCollection();
let id = req.params.id;
res.send(await collection.find({}).toArray());
res.status(201).send();
});
...以便它根據該數據的 id 從 MongoDB 返回特定數據。 我不確定如何設置res.send
以便它根據req.params.id
查找數據。 我試着像這樣傳入req.params.id
......
postRoutes.get('/edit/:id', async (req, res) => {
const collection = await loadPostsCollection();
let id = req.params.id;
res.send(await collection.find({ _id: mongodb.ObjectId(req.params.id)}).toArray());
res.status(201).send();
});
...但這也不起作用。 知道如何設置此路由以根據 ID 參數查找數據嗎? 謝謝!
我的完整 Express 路由器頁面如下:
const express = require('express');
const postRoutes = express.Router();
const mongodb = require('mongodb')
postRoutes.get('/', async (req, res) => {
const collection = await loadPostsCollection();
res.send(await collection.find({}).toArray());
});
postRoutes.post('/add', async (req, res) => {
const collection = await loadPostsCollection();
let task = req.body;
await collection.insertOne(task);
res.status(201).send();
});
postRoutes.get('/view/:id', async (req, res) => {
const collection = await loadPostsCollection();
let id = req.params.id;
res.send(await collection.find({}).toArray());
res.status(201).send();
});
postRoutes.delete('/delete/:id', async (req, res, next) => {
const collection = await loadPostsCollection();
collection.deleteOne({ _id: mongodb.ObjectId(req.params.id) });
res.status(200).send({});
});
async function loadPostsCollection() {
const client = await mongodb.MongoClient.connect(
'...',
{
useNewUrlParser: true
}
);
return client.db("test").collection("todos")
}
module.exports = postRoutes;
你最好像這樣使用findOne
方法:
const { ObjectID } = require("mongodb");
postRoutes.get("/view/:id", async (req, res) => {
const collection = await loadPostsCollection();
let id = req.params.id;
let result = await collection.findOne({
_id: new ObjectID(id)
});
if (!result) {
return res.status(400).send("Not found");
}
res.status(200).send(result);
});
您需要在查找查詢中傳遞過濾器,即
postRoutes.get('/view/:id', async (req, res) => {
const collection = await loadPostsCollection();
let id = req.params.id;
const o_id = new mongo.ObjectID(id);
const result=await collection.find({ id: o_id });
res.status(201).send(result.toArray());
});
此外,您不能為一個請求發送兩次響應,因此請省略一個resp.send()
。
如果您需要來自數據庫的特定數據,則需要使用findById方法並傳遞您的 id 而不是find方法:
postRoutes.get('/edit/:id', async (req, res) => { const collection = await loadPostsCollection(); let id = req.params.id; res.send(await collection.findById(id).toArray()); res.status(201).send(); });
postRoutes.get('/view/:id', async (req, res) => { const collection = await loadPostsCollection(); let id = req.params.id; res.send(await collection.findById(id).toArray()); res.status(201).send(); });
postRoutes.delete('/delete/:id', async (req, res, next) => { const collection = await loadPostsCollection(); collection.deleteOne({ _id:req.params.id}); res.status(200).send({}); });
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.