.gitignore

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+node_modules/
+database.sqlite
+dist/

doc/main.tex

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-\documentclass{article}
-\usepackage[utf8]{inputenc}
-\usepackage{listings}
-\usepackage{xcolor}
-
-% Configure colors for code
-\definecolor{codegreen}{rgb}{0,0.6,0}
-\definecolor{codegray}{rgb}{0.5,0.5,0.5}
-\definecolor{codepurple}{rgb}{0.58,0,0.82}
-\definecolor{backcolour}{rgb}{0.95,0.95,0.92}
-
-% Code listing style
-\lstdefinestyle{mystyle}{
-    backgroundcolor=\color{backcolour},   
-    commentstyle=\color{codegreen},
-    keywordstyle=\color{magenta},
-    stringstyle=\color{codepurple},
-    basicstyle=\ttfamily\footnotesize,
-    breakatwhitespace=false,         
-    breaklines=true,                 
-    captionpos=b,                    
-    keepspaces=true,                 
-    numbers=left,                    
-    numbersep=5pt,                  
-    showspaces=false,                
-    showstringspaces=false,
-    showtabs=false,                  
-    tabsize=2
-}
-
-\lstset{style=mystyle}
-
-\title{Instructions for Integrating Fastify, GraphQL, and TypeORM}
-\author{}
-\date{}
-
-\begin{document}
-
-\maketitle
-
-\section*{Step 1: Install Dependencies}
-Install the required packages using npm:
-\begin{lstlisting}[language=bash]
-npm install fastify mercurius typeorm reflect-metadata sqlite3 graphql
-\end{lstlisting}
-
-\section*{Step 2: Configure TypeORM}
-Create a file named \texttt{ormconfig.json} with the following content:
-\begin{lstlisting}[language=json]
-{
-  "type": "sqlite",
-  "database": "./db.sqlite",
-  "synchronize": true,
-  "logging": false,
-  "entities": ["src/entity/**/*.ts"],
-  "migrations": ["src/migration/**/*.ts"],
-  "subscribers": ["src/subscriber/**/*.ts"]
-}
-\end{lstlisting}
-
-Next, create entities in the \texttt{src/entity} folder. Example of \texttt{User.ts}:
-\begin{lstlisting}[language=typescript]
-import { Entity, PrimaryGeneratedColumn, Column, OneToMany } from 'typeorm';
-import { Post } from './Post';
-
-@Entity()
-export class User {
-  @PrimaryGeneratedColumn()
-  id: number;
-
-  @Column()
-  name: string;
-
-  @OneToMany(() => Post, (post) => post.author)
-  posts: Post[];
-}
-\end{lstlisting}
-
-Example of \texttt{Post.ts}:
-\begin{lstlisting}[language=typescript]
-import { Entity, PrimaryGeneratedColumn, Column, ManyToOne } from 'typeorm';
-import { User } from './User';
-
-@Entity()
-export class Post {
-  @PrimaryGeneratedColumn()
-  id: number;
-
-  @Column()
-  title: string;
-
-  @ManyToOne(() => User, (user) => user.posts)
-  author: User;
-}
-\end{lstlisting}
-
-\section*{Step 3: Configure Fastify with GraphQL}
-Create a file named \texttt{index.ts} with the following content:
-\begin{lstlisting}[language=typescript]
-import 'reflect-metadata';
-import { createConnection } from 'typeorm';
-import fastify from 'fastify';
-import mercurius from 'mercurius';
-import { User } from './entity/User';
-import { Post } from './entity/Post';
-
-const app = fastify();
-
-const schema = `
-  type User {
-    id: ID!
-    name: String!
-    posts: [Post!]!
-  }
-
-  type Post {
-    id: ID!
-    title: String!
-    author: User!
-  }
-
-  type Query {
-    user(id: ID!): User
-  }
-`;
-
-const resolvers = {
-  Query: {
-    user: async (_, { id }) => {
-      return await User.findOne({ where: { id }, relations: ['posts'] });
-    },
-  },
-};
-
-const startServer = async () => {
-  await createConnection();
-
-  app.register(mercurius, {
-    schema,
-    resolvers,
-    graphiql: true,
-  });
-
-  app.listen({ port: 3000 }, (err, address) => {
-    if (err) {
-      console.error(err);
-      process.exit(1);
-    }
-    console.log(`🚀 Server ready at ${address}`);
-  });
-};
-
-startServer();
-\end{lstlisting}
-
-\section*{Step 4: Testing}
-1. Start the server:
-\begin{lstlisting}[language=bash]
-npx ts-node index.ts
-\end{lstlisting}
-
-2. Open your browser at:
-\begin{lstlisting}[language=text]
-http://localhost:3000/graphiql
-\end{lstlisting}
-
-3. Send a sample GraphQL query:
-\begin{lstlisting}[language=graphql]
-query {
-  user(id: 1) {
-    name
-    posts {
-      title
-    }
-  }
-}
-\end{lstlisting}
-
-\end{document}

package.json

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+{
+  "dependencies": {
+    "-": "^0.0.1",
+    "fastify": "^5.2.2",
+    "graphql": "^16.10.0",
+    "mercurius": "^16.1.0",
+    "metadata": "^0.1.0",
+    "reflect": "^0.1.3",
+    "reflect-metadata": "^0.2.2",
+    "sqlite3": "^5.1.7",
+    "typeorm": "^0.3.21",
+    "typeorm-fastify-plugin": "^3.0.0"
+  },
+  "devDependencies": {
+    "@types/node": "^22.13.14"
+  }
+}

src/db.ts

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+import 'reflect-metadata';
+import dbConnection from 'typeorm-fastify-plugin';
+import { User } from './entity/User';
+import { Post } from './entity/Post';
+import { FastifyInstance } from 'fastify';
+
+
+export async function registerDb(fastify: FastifyInstance) {
+  fastify.register(dbConnection, {
+    type: 'sqlite',
+    database: 'database.sqlite',
+    entities: [User, Post],
+    synchronize: true,
+    logging: true,
+  })
+}

src/entity/Post.ts

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+import { Entity, PrimaryGeneratedColumn, Column, ManyToOne } from 'typeorm';
+import { User } from './User';
+
+@Entity()
+export class Post {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column()
+  title: string;
+
+  @ManyToOne(() => User, (user) => user.posts)
+  author: User;
+}

src/entity/User.ts

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+import { Entity, PrimaryGeneratedColumn, Column, OneToMany } from 'typeorm';
+import { Post } from './Post';
+
+@Entity()
+export class User {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column()
+  name: string;
+
+  @OneToMany(() => Post, (post) => post.author)
+  posts: Post[];
+}

src/index.ts

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+import 'reflect-metadata';
+import Fastify from 'fastify';
+import mercurius from 'mercurius';
+import { registerDb } from './db';
+import { User } from './entity/User';
+import { Post } from './entity/Post';
+
+const fastify = Fastify( {
+    logger: true
+});
+
+
+const schema = `
+    type User {
+        id: ID!
+        name: String!
+        posts: [Post!]!
+    }
+
+    type Post {
+        id: ID!
+        title: String!
+        author: User!
+    }
+
+    type Query {
+        user(id: ID!): User
+    }
+
+    type Mutation {
+        createUser(name: String!): User
+        createPost(title: String!, userId: ID!): Post
+    }
+`
+const resolvers = {
+    Query: {
+        user: async (_: unknown, { id }: {id: number} ) => {
+            const userRepository = fastify.orm.getRepository(User)
+            return await userRepository.findOne({where: { id}, relations: ['posts']})
+        }
+    },
+    Mutation: {
+        createUser: async (_: unknown, { name }: {name: string}) => {
+          const user = new User();
+          user.name = name;
+          
+          const userRepository = fastify.orm.getRepository(User)
+          await userRepository.save(user);
+          return user;
+        },
+        createPost: async (_: unknown, { title, userId }: {title: string, userId: number}) => {
+          const userRepository = fastify.orm.getRepository(User)
+          const user = await userRepository.findOne({ where: { id: userId } });
+          if (!user) {
+            throw new Error("User not found");
+          }
+    
+          const postRepository = fastify.orm.getRepository(Post)
+          const post = new Post();
+          post.title = title;
+          post.author = user;
+          await postRepository.save(post);
+          return post;
+        }
+      }
+}
+
+registerDb(fastify);
+
+fastify.register(mercurius, {
+    schema,
+    resolvers,
+    graphiql: true
+})
+
+fastify.listen({ port: 3000}, function (err, address) {
+    if (err) {
+        fastify.log.error(err);
+        process.exit(1);
+    }
+    console.log(`Server listening on ${address}`);
+})

tsconfig.json

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+{
+    "compilerOptions": {
+      "target": "ES6",
+      "module": "CommonJS",
+      "moduleResolution": "node",
+      "outDir": "./dist",
+      "rootDir": "./src",
+      "strict": true,
+      "experimentalDecorators": true,
+      "emitDecoratorMetadata": true,
+      "strictPropertyInitialization": false
+    },
+    "include": ["src"]
+}