How to Create a RESTFUL API with Flask | Postgresql | Python

Step-by-Step Tutorial: Creating a RESTful API with Flask, Postgresql, and Python

1. Setting Up Virtual Environment:

   • Open the terminal and run the command Python3 -m venv <virtual_environment_name> to create a virtual environment.
   • Activate the virtual environment by navigating to the virtual environment folder and running the activate command.

2. Installing Flask:

   • Check the version of pip by running pip --version.
   • Install Flask by running pip install flask.

3. Connecting Postgresql Database to Flask:

   • Create a new file to handle database operations.
   • Import psycopg2 and define the connection string to connect to the database.
   • Execute SQL commands to create tables and insert data.

4. Creating Data Models:

   • Create a folder named models.
   • Inside the folder, create a Python file for the data model with a constructor.

5. Creating Repository for CRUD Operations:

   • Create a repository file to handle CRUD operations.
   • Define methods for getting all nodes, creating a node, updating a node, and deleting a node.

6. Creating Services Layer:

   • Create a services file to add business logic between the repository and routes.
   • Inject the repository into the services file and define methods for handling CRUD operations.

7. Defining Routes with Blueprint:

   • Create a routes file to define API endpoints using Flask's Blueprint.
   • Import necessary modules and methods from the services file.
   • Register the Blueprint with the Flask application.

8. Testing API Endpoints:

   • Test the API endpoints using tools like Postman.
   • Test endpoints for creating, updating, retrieving, and deleting nodes in the database.

9. Finalizing and Deployment:

   • Ensure all routes and methods are working correctly.
   • Make any necessary adjustments and optimizations.
   • Deploy the Flask API to a production environment.

10. Conclusion:

• Your Flask RESTful API with Postgresql integration is now ready for use.
• You can find the code for this project on the creator's GitHub repository.

By following these steps, you can successfully create a RESTful API using Flask, Postgresql, and Python.