#Django

1.1 𝗪𝗵𝗮𝘁 𝗵𝗮𝗽𝗽𝗲𝗻𝘀 𝘄𝗵𝗲𝗻 𝘆𝗼𝘂 𝘁𝘆𝗽𝗲 𝗮 𝗨𝗥𝗟 𝗶𝗻𝘁𝗼 𝘆𝗼𝘂𝗿 𝗯𝗿𝗼𝘄𝘀𝗲𝗿?

The process involves the browser, your computer’s operating system, your internet service provider, the server where you host the site, and services running on that server.

1. You type url.com in your browser
2. The browser looks up the IP address for the domain url.com
3. Then the browser initiate TCP connection with the server
4. The browser the sends the HTTP request to the server
5. The server processes the request and sends back a response
6. The browser then renders the content

Django Introduction

1.1 What is Django?

• Django is a high-level web development framework
• Based on Python
• Free and open source
• Enables Web development to develop quickly and with ease
• Maintained by Django Software Foundation

Django Architecture

• MVC vs MCT Architecture
• Both MVC and MVT are one of the famous design patterns
• They are used for many web application frameworks.
• It is an architectural pattern that separates an application into three main logical components

Django admin

• Django provides a default admin interface
• It can be used to perform create, read, update and delete (CURD) operations on the model directly.
• Provides a convenient interface to manage model data and visualize database

Django Models

• A Django model is the built-in feature that Django uses to create tables, their fields, and various constraints.
• Each model class maps to a single table in the database.
• Django Model is a subclass of django.db.models.Model and each field of the model class represents a database field (column).

# Topic covered
* Django default User Model
* Custom User Model
    * AbstractUser vs AbstractBaseUser
* Validating objects
    * full_clean()
    * Model.clean_fields()
    * Model.clean()
    * Model.validate_unique()

Django settings

• A Django settings file contains all the configuration of your Django installation.
• A settings file is just a Python module with module-level variables.

# setting example
ALLOWED_HOSTS = ['www.example.com']
DEBUG = False
DEFAULT_FROM_EMAIL = '[email protected]'

Django Migrations

• Migration in Django is to make changes to your models
• Like deleting, adding a field, etc. into your database schema.

Django Views

• A view is a place where we put our business logic of the application
• The view is a python function that takes a web request and returns a web response
• This response can be the HTML contents of a Web page, or a redirect, or a 404 error

Django Signal

• The Django Signals is a strategy to allow decoupled applications to get notified when certain events occur.
• There are two key elements in the signals machinery –> the senders and the receivers
• As the name suggests, the sender is the one responsible to dispatch a signal,
• And the receiver is the one who will receive this signal and then do something.