/Django-Website

A website developed in Python & Django

Primary LanguagePython

Django Website

Study Notes

  • Start a new project
    In Terminal
      django-admin startproject projectname
  • Start the server
    In Terminal
      python manage.py runserver
  • Create a new app
    In Terminal
      python manage.py startapp appname
  • Add the app to the root urls.py
    In root urls.py
      from django.urls import include
  # add to urlpatterns
  url('appname/', include(appname.urls)),
    In app urls.py
      from django.contrib import admin
  from django.urls import path
  # add to urlpatterns
  path('', views.index, name='index')    # '' for index page
  • Create models
    In app models.py
    class Model1(models.model):
    column1 = models.DataType(max_length=250)
    column2 = models.DataType(max_length=250)
    
    def __str__(self): # used to show actual content when asked by Model1.objects.all() in shell
      return self.column1 + '  ' + self.column2
    
class Model2(models.model):
    column3 = models.ForeighKey(Model1, on_delete=models.CASADE) # CASADE used for composition relationship
  • Activate models
    In app apps.py
      # add to INSTALLED_APPS
  'appname',
    In Terminal
      python manage.py makemigration appname
  python manage.py migrate
      # to check
  python manage.py sqlmigrate appname idnumber
  • Database API
      python manage.py shell
  
  # import
  from appname.models import Model1, Model2
  
  # to check content
  Model1.objects.all()
  
  # create an object
  a = Model1(column1="someinfo", column2="someinfo")
  a.save()
  # another way to create an object
  b = Model1()
  b.column1 = "someinfo"
  b.column2 = "someinfo"
  b.save()
  
  # to check the content of a
  a.column1
  a.column2
  a.id # primary key, can also be a.pk
  
  # filter
  Model1.objects.filter(column1="someinfo")
  Model1.objects.filter(id=1) # =pk
  Model1.objects.filter(column1__startswith='somechar')