Posts CRUD and Ownership

Goal

This snapshot advances Circuit Daily by teaching you to create, edit, and delete posts with owner authorization.

Every numbered folder is a complete app. Run this stage independently, then compare it with the previous folder.

Prerequisites

Use Node.js 20+, npm, and a terminal. You should recognize TypeScript modules, decorators, and HTTP verbs.

Port 3001 must be free. Copy .env.example before starting database stages.

• Node.js and npm
• A code editor and terminal
• Docker from part 4 onward

Concepts

Authentication identifies a user; authorization compares that identity with post.authorId before mutations.

Keep controllers thin: accept input, call services, render Handlebars views. Escape stays on by default in templates.

Walkthrough

Create posts with the session user id and return 403 when another account attempts edit or delete.

Read the example, then open the matching snapshot. The repository includes the surrounding setup and error handling.

if (!user || user.id !== post.authorId) throw new ForbiddenException();

Run and verify

Enter 09-Posts-CRUD-And-Ownership, install dependencies, copy .env.example when present, and start Nest on port 3001.

Open http://127.0.0.1:3001. Watch the terminal for validation and database errors.

docker compose up -d
git clone https://github.com/michaeldunga1/fcc-nestjs-blog.git
cd fcc-nestjs-blog/09-Posts-CRUD-And-Ownership
npm install
cp .env.example .env
npm run start:dev

Troubleshooting

Forgetting the ownership check is a security bug even if the UI hides edit links.

Missing-module errors usually mean npm install ran in another snapshot. For Postgres failures, confirm Docker and the circuit_NN database name.

• Read the first error first
• Restart after environment changes
• Never commit .env or node_modules

Try this

Log in as Ada and confirm Grace's post returns 403 on delete.

Test a happy path and one invalid or unauthorized request.

• Make one small change
• Test it in the browser
• Compare with the next snapshot only after it works