Django Project Example

Last Update

• 13 Aug 2018, migrate to Django 2.1, adjust some code, add some README content.

Target :

• Setup Project & Apps
• Model with all common used data type
• Web form CRUD single table
• User Authenticaton
• Model association & One-to-Many Web form CRUD
• Login, Logout, Remember Password, Session.

0. Setup Python Virtual Environment

• With Anaconda Distribution

   # Example: conda create --name <ve-name> <package> conda create --name mydjango django # to activate virtual environment source activate mydjango # to deactivate virtual environment source deactivate mydjango # to remove virtual environment conda remove -n mydjango -all # to list all available virtual environment conda info --envs

• With Python Virtual Env

  • Create virtual environment, execute:

  mkvirtualenv <env-name>

  Example:

  mkvirtualenv djangoEnv

  • activate virtual environment:

  workon djangoEnv

  • deactivate virtual environment:

  deactivate

  • references:

  Python Virtual Environment

• Listing all current Virtual Env Library & Version

  pip freeze --local

  or

  pip list

1. Install and Create Django Project

• Install django through pip, execute cmd: pip install Django
• Check installed django version, execute cmd: python -m django --version
• Creating a new project, execute cmd: django-admin startproject <project-name>
• Creating a new apps, execute cmd: python manage.py startapp <app-name>
• To run server, execute cmd: python manage.py runserver
• Run server with custom port, execute cmd: python manage.py runserver 9696
• Run django command shell, execute cmd: python manage.py shell

2. Project Setup

• Open file <project-name>/settings.py
• Search for DATABASE pythons dictionary variable.
• Default ENGINEis SQLite: django.db.backends.sqlite3
• Another options for ENGINE:
  • PostgreSQL: django.db.backends.postgresql
  • MySQL/MariaDB: django.db.backends.mysql
  • OracleDB: django.db.backends.oracle
  • MS SQL Server
  • Firebird
• For another db engine than SQLite, there're other variable, for example:

  DATABASES= {
  'default': {
  'ENGINE': 'django.db.backends.postgresql',
  'NAME': 'mydatabase',
  'USER': 'mydatabaseuser',
  'PASSWORD': 'mypassword',
  'HOST': '127.0.0.1',
  'PORT': '5432',
  }
  }

• To make a new migration of changes, execute cmd: python manage.py makemigrations
• To make a new migration by certain apps, execute cmd: python manage.py makemigrations <apps-name>
• To check out the underlying SQL of migrations, execute cmd: python manage.py sqlmigrate <apps-name> <version>
• To apply database changes, execute cmd: python manage.py migrate
• Time zone setup, look for TIME_ZONE variable, list of TZ available Here.

  TIME_ZONE='Asia/Jakarta'

3. Admin Page

• Create an admin account, execute cmd: python manage.py createsuperuser

4. Model Fields

• Common used MySQL database field to Django data type:

MySQL Field	Django Model Field	Parameters
VARCHAR	CharField	max_length, unique, null, blank, default, primary_key
VARCHAR	EmailField	null, blank, default
VARHCAR	URLField	null, blank, default
LONGTEXT	TextField	null, blank, default
INT	IntegerField	null, default
DECIMAL	DecimalField	null, default
TINYINT / BOOLEAN	BooleanField	null, default
DATE	DateField	null, default
TIME	TimeField	null, default
DATETIME	DateTimeField	null, default
LONGBLOB	BinaryField	null, default

• Django Models database association data type:
  • ForeignKey , a field type that allows us to create a one-to-many relationship.
  • OneToOneField , a field type that allows us to define a strict one-to-one relationship.
  • ManyToManyField , a field type which allows us to define a many-to-many relationship.
• References:
  • Database Model Fields Reference
  • Database Model Meta Options Reference

5. Making Model Queries

• Some queries example:
  • Select all data from model objects

  Person.objects.all() 

  • Select with criteria filter & order DESC

  Person.objects.filter(id=23).order_by('-first_name')

• References:
  • Making Queries
  • Performing raw SQL queries

6. Forms Validator

• References:
  • Form and field validation
  • Form Validators

7. View

• References:
  • Class-based Views

8. Other Library and Addons

• Command to install addons

  # Python Mysqlpip install mysqlclient
  # Python PostgreSQLpip install psycopg2
  # Django-Bootstrap-Formpip install django-bootstrap-form
  # Django Jinjapip install django-jinja
  # Pillow Lib (Image manipulation library for Python)pip install pillow
  # Bcrypt (Secure Password Hasher)pip install bcrypt 

9. Django Best Practice, Standard & Convention

For Django best practice guide and reference, pleas view this page.

Other References

• Writing your first Django app, part 1
• Using a 3rd-party database backend
• Django-Bootstrap-Form Lib 1
• Django-Bootstrap-Form Lib 2
• Add User Profile To Django Admin
• 5 ways to make Django Admin safer
• Awsome Django Lib & Template
• PostgreSQL specific model fields

Python Tutorial

Coming soon...