CRUD

Understand the idea

These are the core lifecycle operations for stored resources. The browser or API initiates them, the service applies business rules, and the repository persists or retrieves documents. Each operation needs a defined behavior for invalid input and unavailable records.

A concrete example

Create → save a new task
Read → list or get one
Update → edit title/status
Delete → remove an owned task

In the application

All three manuals implement the same CRUD workflow with different interfaces and security requirements.

A working happy-path create is not a complete CRUD test. Verify missing ids, invalid fields, deletion, and persistence after restart.

See it in a working stage

• Stage 11: Store and change products in MongoDB

Related concepts

• Service layer
• Repository
• REST / resource API