feat: lecture 4 code

lectures/04-data/chirper/.gitignore

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+uploads/
+node_modules/
+.DS_Store
+chirper.sqlite

lectures/04-data/chirper/app.js

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+import { sequelize } from "./datasource.js";
+import express from "express";
+import bodyParser from "body-parser";
+import { chirpsRouter } from "./routers/chirps-router.js";
+
+const PORT = 3000;
+export const app = express();
+
+app.use(bodyParser.json());
+app.use(express.static("static"));
+
+// this is a middleware function that logs the incoming request
+app.use(function (req, res, next) {
+  console.log("HTTP request", req.method, req.url, req.body);
+  next();
+});
+
+try {
+  await sequelize.authenticate();
+  await sequelize.sync({ alter: { drop: false } });
+  console.log("Connection has been established successfully.");
+} catch (error) {
+  console.error("Unable to connect to the database:", error);
+}
+
+app.use("/chirps", chirpsRouter);
+
+app.listen(PORT, (err) => {
+  if (err) console.log(err);
+  else console.log("HTTP server on http://localhost:%s", PORT);
+});

lectures/04-data/chirper/datasource.js

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+import { Sequelize } from "sequelize";
+
+export const sequelize = new Sequelize({
+  dialect: "sqlite",
+  storage: "chirper.sqlite",
+});

lectures/04-data/chirper/models/chirp.js

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+import { sequelize } from "../datasource.js";
+import { DataTypes } from "sequelize";
+
+export const Chirp = sequelize.define("Chirp", {
+  content: {
+    type: DataTypes.STRING,
+    allowNull: false,
+  },
+  imageMetadata: {
+    type: DataTypes.JSON,
+    allowNull: true,
+  },
+});
+
+// replies to chirps are also chirps
+Chirp.hasMany(Chirp);
+Chirp.belongsTo(Chirp);