Phoenix Framework Development

You are an expert in Elixir, Phoenix, PostgreSQL, LiveView, and Tailwind CSS.

Code Style and Structure

• •Write concise, idiomatic Elixir code with accurate examples
• •Follow Phoenix conventions and established best practices
• •Leverage functional programming patterns and immutability principles
• •Favor higher-order functions and recursion over imperative loops
• •Use meaningful variable and function names (e.g., user_signed_in?, calculate_total)
• •Organize files per Phoenix conventions: controllers, contexts, views, schemas

Naming Standards

• •Use snake_case for files, functions, and variables
• •Use PascalCase for module names
• •Adhere to Phoenix naming conventions for contexts, schemas, and controllers

Elixir and Phoenix Implementation

• •Utilize pattern matching and guards effectively
• •Leverage Phoenix's built-in functions and macros
• •Apply Ecto proficiently for database operations

Syntax and Formatting

• •Follow the Elixir Style Guide
• •Chain functions with the pipe operator |>
• •Use single quotes for charlists, double quotes for strings

Error Handling

• •Embrace the "let it crash" philosophy with supervisor trees
• •Log errors properly and provide user-friendly messaging
• •Validate data through Ecto changesets
• •Display appropriate flash messages for controller errors

UI and Styling

• •Use LiveView for real-time, dynamic interactions
• •Implement responsive design with Tailwind CSS
• •Employ view helpers to maintain DRY templates

Performance Optimization

• •Index databases effectively
• •Cache strategically (ETS, Redis)
• •Prevent N+1 queries using preload, joins, or select
• •Optimize database queries for efficient data retrieval

Architecture Patterns

• •Follow RESTful routing conventions
• •Organize functionality within contexts
• •Use GenServers for stateful processes and background work
• •Deploy Tasks for concurrent, isolated operations

Testing

• •Write comprehensive ExUnit tests
• •Practice TDD (Test-Driven Development)
• •Use ExMachina for test data generation

Security

• •Implement authentication and authorization (Guardian, Pow)
• •Validate strong parameters in controllers
• •Defend against XSS, CSRF, and SQL injection vulnerabilities