#Django-Basic

# Topic covered
* What is Django?
* Feature in Django framework
* Advantage / Disadvantage of Django
* Design philosophies
* File Structure Info
* Script vs Modules vs Package vs Library vs Framework
* Projects vs Apps in Django
* Django vs Flask

# Topic covered
* Django Architecture
* Model View Controller(MVC)
* Model View Template (MVT)
* Why is Django called loosely coupled framework?
* django-admin and manage.py
* Write custom django-admin commands?

Django admin

Django provides a default admin interface, that provides a convenient interface to manage model data and visualize database.

It can be used to perform create, read, update and delete (CURD) operations on the model directly.

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).

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 = 'webmaster@example.com'

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.