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Inventory Management System

A simple inventory management system for a cyberpunk-themed game using FastAPI, SQLAlchemy, and PostgresSQL. The system manages items that players can acquire in the game. These items could range from cybernetic enhancements to weapons and gadgets. The API provides basic CRUD (Create, Read, Update, Delete) functionality for these items.

Table of contents

About this project

Motivation

While I've worked primarily with synchronous approaches in the past, this project allows me to apply and refine my skills in working with asynchronous things.

Conceptual decisions

Database schema

Decided to separate the category field into its own table and added a foreign key reference to the Item table, allowing items to optionally be associated with a category with allowing the Item to exist without an associated Category. Item and Category have references to each other by sqlalchemy.orm.relationship.

API module structure

Inventory CRUD functionality is placed in the inventory module separated by entity type. Users CRUD is located in a separate module from inventory, as it does not directly relate to inventory functionality. Due to separation pydentic Item and Category schemas they have cyclic references and that problem was resolved with __future__.annotations, imports in the bottom and schema.rebuild_model().

API endpoints usage

Just for fun authorized active users without superuser privileges may have access to items related endpoints only. Superusers have access to any categories and items endpoints.

Project structure

├── docker                 | Dockerfiles and entrypointscripts 
├── migrations             | contains migrations separated in folders by DB name
│   └── postgresql
│       └── versions
├── src                    | contains project code
│   ├── api                | web API main module 
│   │   ├── inventory      | stuff related to CRUD functionality (endpoints, requests schemas, etc.)
│   │   │   ├── category
│   │   │   ├── item
│   │   ├── users          | users CRUD and auth part
│   │   └── utils          | utils include common stuff, dependencies, helpers, etc.
│   ├── db                 | module with DB's models, engines, sessions getters, etc.
│   │   ├── postgresql
└── tests
    ├── test_api
    │   ├── test_category
    │   └── test_item
    └── test_db

Project documentation

Technology stack

  • FastAPI
    • fastapi-users
    • pydantic
    • uvicorn
    • etc.
  • DBs
    • PostgresSQL
      • asyncpg
      • sqlalchemy[asyncio]
      • etc.
    • Redis
    • Migrations
      • alembic
  • Project dependencies
    • poetry
  • Tests
    • pytest
    • pytest-asyncio
    • pytest-mock
    • pytest-cov
    • etc.
  • Docker
    • docker compose v2