sahaavi / django

django for beginners

django

Create a project in Django

django-admin startproject projectName

In django you can have one main app and subset apps of that main app. For example, instagram is the main app and direct messages, feed and insta store is subset of that app.

create an app

Before excuting the code below make sure you're in the root directory of your project!
Root directory is where the manage.py lies.

python manage.py startapp appName

Create pages in app

create a file called urls.py inside your app directory.
Then go to views.py to create views for each page. Then go to the urls.py in project folder and include the urls of app.

Run project

python manage.py runserver

Set Templates

Make a folder call templates and go the project folder settings file and add the templates folder location as value in TEMPLATES dictionary's DIRS key.

TEMPLATES = [
    {
        "BACKEND": "django.template.backends.django.DjangoTemplates",
        "DIRS": [BASE_DIR, "templates"],
        "APP_DIRS": True,
        "OPTIONS": {
            "context_processors": [
                "django.template.context_processors.debug",
                "django.template.context_processors.request",
                "django.contrib.auth.context_processors.auth",
                "django.contrib.messages.context_processors.messages",
            ],
        },
    },
]

Now we have to change the return value of index function in view.py to render.

TO add the app to the project go to the project settings file and add myapp in INSTALLED APPS

To save the changes in app's model file and make it a database we need to run the command python manage.py makemigrations then python manage.py migrate So it sends the data to django database

We can check it in django admin panel. admin panel url: http://127.0.0.1:8000/admin

But we don't have any credentials so we have to create the superuser now. Run the command below
python manage.py createsuperuser

We have to register the model databse in admin.py of our app in order to see it in the admin panel.

Now we can add data from the admin panel.

Dynamic URL Routing

Make a path in app urls.py path('post/<str:pk>, views.post, name='post') Then make the post function in views

def post(request, pk):
    return render(request, 'post.html', {'pk': pk})

Make the post.html file inside template

<h1>The value in the url is {{pk}}</h1>

Now you will get whatever you want as you pass after this post http://127.0.0.1:8000/post/

Connect to PostgreSQL Database

goto projects settings.py & modify the DATABASES variable

change the engine to postgresql & change the name to your database name

DATABASES = {
    "default": {
        "ENGINE": "django.db.backends.postgresql",
        "NAME": "django",
        "USER": 'postgres',
        "PASSWORD": '',
        "HOST": 'localhost'
    }
}

Then isntall 2 packages 'psycopg2' & 'Pillow'. Now execute the command below: python manage.py makemigrations then python manage.py migrate