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Mastering Flask-SQLAlchemy: A Guide to Seamless Database Integration

Introduction Welcome to the world of Flask, a lightweight yet powerful web framework for Python enthusiasts. In today's post, we're diving into Flask-SQLAlchemy, an extension that makes it easier and more efficient to interact with databases using SQLAlchemy, the popular ORM (Object-Relational Mapping) tool for Python. Setting up the Stage Installation: First things first, let's set up our environment. Assuming you have Flask installed, you need to install Flask-SQLAlchemy: pip install Flask - SQLAlchemy Why Virtual Environments? It's always a good idea to work in a virtual environment to keep your project dependencies organized and isolated. SQLAlchemy Basics ORM in a Nutshell: SQLAlchemy as an ORM allows us to interact with our database using Python classes and objects, rather than writing SQL queries directly. The Benefits: This approach not only makes the code more readable but also simplifies database operations and maintenance. Configuring Flask-SQLAlchemy Ki...
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How to Setup User Login in Flask?

In this tutorial, we are going to use flask login library for our app user authentication. So let's get started, How to use this. First, create a project folder and in this folder make a virtual environment for our project. Here I am using pipenv for virtual environment. Now install required python packages for our project. flask  pip install Flask flask-login pip install Flask-Login flask-SQLalchemy pip install Flask-SQLAlchemy Now create a file models.py for database model. from flask_sqlalchemy import SQLAlchemy from werkzeug.security import generate_password_hash, check_password_hash from flask_login import UserMixin db = SQLAlchemy() class UserModel (UserMixin, db . Model): __tablename__ = 'users' id = db . Column(db . Integer, primary_key = True ) email = db . Column(db . String( 80 ), unique = True ) username = db . Column(db . String( 100 )) password_hash = db . Column(db . String()) def set_password ( self ,pas...
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How to upload files in flask API?

Hello everyone, In this tutorial. we are going to create an API that getting image files to save on the server. So our requirement is very simple. We are using flask as our framework for creating API. Then we use a simple HTML template where we create a form with a select files field. We send selected files in our API using AjaxJS to save them on the server. First, create a project directory then create a virtual environment for this project. So here I use pipenv to create an environment and you can also use virutalenv. Now install our flask library. Then create a python file. In this minimal start code for flask app. pipenv install flask Now create a method for API you can name it whatever you want. This is our API method. @app . route( '/upload' , methods = [ 'POST' ]) def uploadFile (): We are creating a simple HTML template in a flask and create a method for this to render. <!doctype html> <html lang="en" > <head> <!-- Requi...
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How to convert epoch timestamp into date time string?

We are going to convert epoch timestamp into a date-time string. function convertDateTime(timeStamp){     var milliSecTimeStamp = 0;     if(String(timeStamp).length <= 10){         milliSecTimeStamp = parseInt(timeStamp)*1000;     }else{         milliSecTimeStamp = parseInt(timeStamp);     }     var dateTime = new Date(milliSecTimeStamp);     var date = dateTime.getDate();     var month = dateTime.getMonth();     var year = dateTime.getFullYear();     var dateFormat = date+'-'+month+'-'+year;     return dateFormat; } 
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How to create Django custom user model?

This is a simple essay tutorial. We use Django abstract class to create custom user modal. This is from official documents. 1.  We have to create an app for account management. 2.  In this, we import Django abstract class from Django in models.py file. from django.contrib.auth.models import AbstractUser   3.  Now we use this AbstractUser  class in model class parameter like this. 4.  Here we define our custom fields for user model -  First Name -  Last Name -  User Name -  Email -  Password -  Dob 5.  After created this we tell Django to user this as Django default user model by adding it in setting.py file Note - Here is app name first and then the model n 6.  Now we can change our Django base user manager method with custom fields. 7. In this, we first import base user manager and create methods. 8.  Now set this manager to our custom user model With Objects = MyUserManager() In this, we set the default...
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