Elearning Platform Developer

Creating an e-learning platform for high school students with **Flask** (backend) and **React** (frontend) requires a systematic approach. Below is a detailed guide for each step: --- ## **1. Setting up a Modular and Scalable Project Structure** ### **Backend: Flask** Create the following structure for your Flask backend: ``` e_learning_backend/ │ ├── app/ │ ├── __init__.py # Application factory │ ├── models.py # Database models │ ├── routes/ │ │ ├── __init__.py # Blueprint initialization │ │ ├── course_routes.py # Course-related endpoints │ │ ├── user_routes.py # User-related endpoints │ │ ├── feedback_routes.py # Feedback endpoints │ ├── services/ │ │ ├── auth_service.py # Authentication logic │ │ ├── course_service.py # Course-related business logic │ ├── utils/ │ │ ├── helpers.py # Utility functions │ │ ├── validators.py # Data validation ├── migrations/ # Flask-Migrate scripts ├── config.py # Configuration settings ├── requirements.txt # Python dependencies ├── run.py # Entry point for the application ``` ### **Frontend: React** Create the following structure for your React frontend: ``` e_learning_frontend/ │ ├── public/ # Static assets ├── src/ │ ├── components/ │ │ ├── Header.js # Navigation bar │ │ ├── Footer.js # Footer │ ├── pages/ │ │ ├── Home.js # Homepage │ │ ├── CourseDetails.js # Detailed course page │ │ ├── Dashboard.js # User dashboard │ ├── api/ │ │ ├── apiClient.js # Axios client for API requests │ ├── App.js # Main component │ ├── index.js # Entry point ├── package.json # JavaScript dependencies ``` --- ## **2. Designing the Database Schema** Use SQLAlchemy (with Flask) to define the schema. Below is an example: ```python from flask_sqlalchemy import SQLAlchemy db = SQLAlchemy() class User(db.Model): id = db.Column(db.Integer, primary_key=True) username = db.Column(db.String(80), unique=True, nullable=False) email = db.Column(db.String(120), unique=True, nullable=False) password = db.Column(db.String(200), nullable=False) role = db.Column(db.String(20), nullable=False) # admin, instructor, learner class Course(db.Model): id = db.Column(db.Integer, primary_key=True) title = db.Column(db.String(120), nullable=False) description = db.Column(db.Text, nullable=False) instructor_id = db.Column(db.Integer, db.ForeignKey('user.id')) lessons = db.relationship('Lesson', backref='course', lazy=True) class Lesson(db.Model): id = db.Column(db.Integer, primary_key=True) title = db.Column(db.String(120), nullable=False) video_url = db.Column(db.String(200), nullable=False) course_id = db.Column(db.Integer, db.ForeignKey('course.id')) progress = db.relationship('Progress', backref='lesson', lazy=True) class Feedback(db.Model): id = db.Column(db.Integer, primary_key=True) content = db.Column(db.Text, nullable=False) user_id = db.Column(db.Integer, db.ForeignKey('user.id')) course_id = db.Column(db.Integer, db.ForeignKey('course.id')) class Progress(db.Model): id = db.Column(db.Integer, primary_key=True) user_id = db.Column(db.Integer, db.ForeignKey('user.id')) lesson_id = db.Column(db.Integer, db.ForeignKey('lesson.id')) completed = db.Column(db.Boolean, default=False) ``` --- ## **3. Implementing User Roles and Secure Authentication** ### **Roles** - Use `role` in the `User` model for access control. ### **Authentication** Use Flask-Login for session management and Flask-JWT-Extended for token-based authentication. Example: ```python from flask_jwt_extended import JWTManager, create_access_token, jwt_required, get_jwt_identity app.config['JWT_SECRET_KEY'] = 'supersecretkey' # Replace with a secure key jwt = JWTManager(app) # Login Route @app.route('/login', methods=['POST']) def login(): data = request.get_json() user = User.query.filter_by(username=data['username']).first() if user and check_password_hash(user.password, data['password']): token = create_access_token(identity=user.id) return jsonify(token=token) return jsonify(message="Invalid credentials"), 401 ``` --- ## **4. Developing APIs** ### Example: Course Management APIs ```python @app.route('/courses', methods=['POST']) @jwt_required() def create_course(): current_user = get_jwt_identity() user = User.query.get(current_user) if user.role != 'instructor': return jsonify({"error": "Unauthorized"}), 403 data = request.get_json() new_course = Course( title=data['title'], description=data['description'], instructor_id=user.id ) db.session.add(new_course) db.session.commit() return jsonify({"message": "Course created"}), 201 ``` --- ## **5. Integrating Video Hosting** Use a service like **Cloudinary** or **AWS S3** for hosting. - Frontend: Use the **React Player** library for embedding videos. - Backend: Upload video files via API and store URLs in the `video_url` field of the `Lesson` model. --- ## **6. Adding Features: Quizzes, Certificates, and Forums** - **Quizzes**: Add a `Quiz` table linked to `Course`, and store questions and options. - **Certificates**: Generate certificates with libraries like `ReportLab` in Python. - **Forums**: Add a `Forum` table with threads and comments linked to `Course`. --- ## **7. Ensuring Responsive Design** Use **Material-UI** or **Tailwind CSS** for a responsive frontend. Test responsiveness on multiple devices. --- ## **8. Commenting and Future Scalability** - Add comments for each function and module explaining its purpose. - Future scalability: - Use **Celery** for task queues (e.g., sending emails). - Integrate a CI/CD pipeline for deployments. - Add support for multiple languages. Let me know if you'd like sample implementations of specific features or help setting up the development environment!