https://ai-blog.noorshomelab.dev/tags/sqlalchemy/Recent content in SQLAlchemy on AI VOIDHugoenWed, 20 Aug 2025 00:00:00 +0000https://ai-blog.noorshomelab.dev/chat-guide/chapter-6-sqlite-messages/Wed, 20 Aug 2025 00:00:00 +0000https://ai-blog.noorshomelab.dev/chat-guide/chapter-6-sqlite-messages/<p>A real chat application needs to store messages to provide chat history. This chapter will guide you through setting up a SQLite database and integrating it into our FastAPI application using SQLAlchemy, a powerful SQL toolkit and Object-Relational Mapper (ORM).</p> <h3 id="purpose-of-this-chapter">Purpose of this Chapter</h3> <p>By the end of this chapter, you will:</p> <ul> <li>Understand the basics of ORM and why we use SQLAlchemy.</li> <li>Set up a SQLite database connection.</li> <li>Define database models for users and chat messages.</li> <li>Implement methods to store new messages and retrieve chat history.</li> <li>Update the WebSocket endpoint to save messages.</li> </ul> <h3 id="concepts-explained-sqlalchemy-and-orm">Concepts Explained: SQLAlchemy and ORM</h3> <p><strong>Object-Relational Mapping (ORM)</strong> is a technique that lets you query and manipulate data from a database using an object-oriented paradigm. Instead of writing raw SQL, you interact with database tables as Python classes and objects.</p>https://ai-blog.noorshomelab.dev/chat-guide/chapter-8-user-auth-flow/Wed, 20 Aug 2025 00:00:00 +0000https://ai-blog.noorshomelab.dev/chat-guide/chapter-8-user-auth-flow/<p>While we introduced basic user registration and login in Chapter 4, this chapter focuses on refining these critical endpoints. We&rsquo;ll ensure robust data validation, provide clear error messages, and integrate the user management more tightly with our database. This is about building a solid, production-ready authentication foundation.</p> <h3 id="purpose-of-this-chapter">Purpose of this Chapter</h3> <p>By the end of this chapter, you will:</p> <ul> <li>Have dedicated endpoints for user registration and login.</li> <li>Understand data validation for incoming user data.</li> <li>Implement proper password hashing and verification.</li> <li>Ensure that authenticated users are correctly identified and used throughout the application.</li> </ul> <h3 id="concepts-explained-data-validation--error-handling">Concepts Explained: Data Validation &amp; Error Handling</h3> <p><strong>Data Validation:</strong> Ensuring that incoming data (like username and password during registration) meets expected criteria. FastAPI leverages Pydantic for this, which allows you to define strict schemas for your request bodies.</p>