将MongoDB与React集成

import express from "express";
import cors from "cors";
import restaurants from "./routes/restaurant.js";
const PORT = process.env.PORT || 5050;
const app = express();
app.use(cors());
app.use(express.json());
app.use("/restaurant", restaurants);
// start the Express server
app.listen(PORT, () => {
  console.log(`Server listening on port ${PORT}`);
});

import express from "express";
import db from "../db/connection.js";
// Creates an instance of the Express router, used to define our routes
const router = express.Router();
// Gets a list of all the restaurants
router.get("/", async (req, res) => {
  let collection = await db.collection("restaurants");
  let results = await collection.find({}).toArray();
  res.send(results).status(200);
});
// Lists restaurants that match the query filter
router.get("/browse", async (req, res) => {
  try {
    let collection = await db.collection("restaurants");
    let query = {
      borough: "Queens",
      name: { $regex: "Moon", $options: "i" },
    };
    let results = await collection.find(query).toArray();
    res.send(results).status(200);
  } catch (err) {
    console.error(err);
    res.status(500).send("Error browsing restaurants");
  }
});
export default router;

import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
import tailwindcss from '@tailwindcss/vite'
// https://vite.dev/config/
export default defineConfig({
plugins: [
   react(),
   tailwindcss()
  ],
})

import * as React from "react";
import * as ReactDOM from "react-dom/client";
import { createBrowserRouter, RouterProvider } from "react-router-dom";
import App from "./App";
import RestaurantList from "./components/RestaurantList";
import "./index.css";
const router = createBrowserRouter([
  {
    path: "/",
    element: <App />,
    children: [
      {
        path: "/",
        element: <RestaurantList />,
      },
    ],
  },
  {
    path: "/browse",
    element: <App />,
    children: [
      {
        path: "/browse",
        element: <RestaurantList />,
      },
    ],
  },
]);
ReactDOM.createRoot(document.getElementById("root")).render(
  <React.StrictMode>
    <RouterProvider router={router} />
  </React.StrictMode>,
);

import { NavLink } from "react-router-dom";
export default function Navbar() {
  return (
    <div>
      <nav className="flex justify-between items-center mb-6">
        <NavLink to="/">
          <img
            alt="MongoDB logo"
            className="h-10 inline"
            src="https://d3cy9zhslanhfa.cloudfront.net/media/3800C044-6298-4575-A05D5C6B7623EE37/4B45D0EC-3482-4759-82DA37D8EA07D229/webimage-8A27671A-8A53-45DC-89D7BF8537F15A0D.png"
          ></img>
        </NavLink>
      </nav>
    </div>
  );
}

import { useEffect, useState } from "react";
import { useLocation } from "react-router-dom";
const Restaurant = (props) => (
  <tr className="border-b transition-colors hover:bg-muted/50 data-[state=selected]:bg-muted">
    <td className="p-4 align-middle [&:has([role=checkbox])]:pr-0">
      {props.restaurant.name}
    </td>
    <td className="p-4 align-middle [&:has([role=checkbox])]:pr-0">
      {props.restaurant.borough}
    </td>
    <td className="p-4 align-middle [&:has([role=checkbox])]:pr-0">
      {props.restaurant.cuisine}
    </td>
  </tr>
);
export default function RestaurantList() {
  const [restaurants, setRestaurants] = useState([]);
  const location = useLocation();
  // Fetches the restaurants from the database
  useEffect(() => {
    async function getRestaurants() {
      // Determines which endpoint to call based on current route
      const endpoint =
        location.pathname === "/browse"
          ? "http://localhost:5050/restaurant/browse"
          : "http://localhost:5050/restaurant/";
      const response = await fetch(endpoint);
      if (!response.ok) {
        const message = `An error occurred: ${response.statusText}`;
        console.error(message);
        return;
      }
      const restaurants = await response.json();
      setRestaurants(restaurants);
    }
    getRestaurants();
    return;
  }, [location.pathname]);
  // Maps each restaurant on the table
  function restaurantList() {
    return restaurants.map((restaurant) => {
      return <Restaurant restaurant={restaurant} key={restaurant._id} />;
    });
  }
  // Retrieves the dynamic title based on current route
  const getTitle = () => {
    return location.pathname === "/browse"
      ? 'Filtered Restaurants (Queens, containing "Moon")'
      : "All Restaurants";
  };
  // Displays the restaurants table
  return (
    <>
      <h3 className="text-lg font-semibold p-4">{getTitle()}</h3>
      <div className="border rounded-lg overflow-hidden">
        <div className="relative w-full overflow-auto">
          <table className="w-full caption-bottom text-sm">
            <thead className="[&_tr]:border-b">
              <tr className="border-b transition-colors hover:bg-muted/50 data-[state=selected]:bg-muted">
                <th className="h-12 px-4 text-left align-middle font-medium text-muted-foreground [&:has([role=checkbox])]:pr-0">
                  Name
                </th>
                <th className="h-12 px-4 text-left align-middle font-medium text-muted-foreground [&:has([role=checkbox])]:pr-0">
                  Borough
                </th>
                <th className="h-12 px-4 text-left align-middle font-medium text-muted-foreground [&:has([role=checkbox])]:pr-0">
                  Cuisine
                </th>
              </tr>
            </thead>
            <tbody className="[&_tr:last-child]:border-0">
              {restaurantList()}
            </tbody>
          </table>
        </div>
      </div>
    </>
  );
}

import { Outlet } from "react-router-dom";
import Navbar from "./components/Navbar";
const App = () => {
  return (
    <div className="w-full p-6">
      <Navbar />
      <Outlet />
    </div>
  );
};
export default App;