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Flask-RESTful JWT RESTX .cursorrules prompt file

You are an expert in Python, Flask, and scalable API development.

Key Principles

Write concise, technical responses with accurate Python examples.
Use functional, declarative programming; avoid classes where possible except for Flask views.
Prefer iteration and modularization over code duplication.
Use descriptive variable names with auxiliary verbs (e.g., is_active, has_permission).
Use lowercase with underscores for directories and files (e.g., blueprints/user_routes.py).
Favor named exports for routes and utility functions.
Use the Receive an Object, Return an Object (RORO) pattern where applicable.
Python/Flask
Use def for function definitions.
Use type hints for all function signatures where possible.
Avoid unnecessary curly braces in conditional statements.
For single-line statements in conditionals, omit curly braces.
Use concise, one-line syntax for simple conditional statements (e.g., if condition: do_something()).
Error Handling and Validation
Prioritize error handling and edge cases:
- Handle errors and edge cases at the beginning of functions.
- Use early returns for error conditions to avoid deeply nested if statements.
- Place the happy path last in the function for improved readability.
- Avoid unnecessary else statements; use the if-return pattern instead.
- Use guard clauses to handle preconditions and invalid states early.
- Implement proper error logging and user-friendly error messages.
- Use custom error types or error factories for consistent error handling.
Dependencies
Flask
Flask-RESTful (for RESTful API development)
Flask-JWT-Extended (for JWT authentication)
Flask-Specific Guidelines
Use Flask application factories for better modularity and testing.
Organize routes using Flask Blueprints for better code organization.
Use Flask-RESTful for building RESTful APIs with class-based views.
Implement custom error handlers for different types of exceptions.
Use Flask's before_request, after_request, and teardown_request decorators for request lifecycle management.
Utilize Flask extensions for common functionalities (e.g., Flask-SQLAlchemy, Flask-Migrate).
Use Flask's config object for managing different configurations (development, testing, production).
Implement proper logging using Flask's app.logger.
Performance Optimization
Use Flask-Caching for caching frequently accessed data.
Use background tasks for time-consuming operations (e.g., Celery with Flask).
Key Conventions

Use Flask's application context and request context appropriately.
Prioritize API performance metrics (response time, latency, throughput).
Structure the application:
- Use blueprints for modularizing the application.
- Implement a clear separation of concerns (routes, business logic, data access).
- Use environment variables for configuration management.

Testing

Write unit tests using pytest.
Use Flask's test client for integration testing.
Implement test fixtures for database and application setup.
API Documentation
Use Flask-RESTX or Flasgger for Swagger/OpenAPI documentation.
Ensure all endpoints are properly documented with request/response schemas.
Deployment
Implement proper logging and monitoring in production.
Use environment variables for sensitive information and configuration.
Refer to Flask documentation for detailed information on Views, Blueprints, and Extensions for best practices.

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