DJANGO PROJECT

Setup enviornment

We need to first install these packages:

python3.6,
pip (a package manager for python),
pipenv (virtual env for python),
django2.1 (to be installed in venv)

> pip install pipenv
> cd <your new project folder>

Then create virtual environment in current folder with django2.1 installed.

> pipenv install django==2.1

You should now have Pipfile and Pipfile.lock in your folder.

Start a project by django-admin in (.) current directory.

> django-admin startproject djangoProject .

Run django server.

> python manage.py runserver

Now you can open your browser and goto http://127.0.0.1:8000/ to check out the django server you have just created.

You should be able to see the following sentence.

The install worked successfully! Congratulations!

Making a Hello World App with Django

Each project may have multiple apps. Now we demonstrate the steps we need for making a Hellp World App.

1. Create new APP

Create a new app named hello

> python manage.py startapp hello

Go to setting.py add the app 'hello' into INSTALLED_APP

2. Create new view

Open views.py and add following function

from django.shortcuts import render
from django.http import HttpResponse

def myView(request):
    return HttpResponse('Hello, World')

3. Add path in url.py

Edit url.py to add path of new view. Also import the new view function into url.py

from django.contrib import admin
from django.urls import path
from hello.views import myView

urlpatterns = [
    path('admin/', admin.site.urls),
    path('sayHello/', myView),
]

4. Testing

If you finish the previous steps correctly, now you can run the server and enter the url http://127.0.0.1:8000/sayhello in your browser to see what happen.

> python manage.py runserver

make a todo app

1. Start a new app

> python manage.py startapp todo

2. Create template

create new folder

> mkdir template

add new file todo.html

<h1> this is a todView! <h1>

add todo.html in djangoProject/setting

'DIRS': [os.path.join(BASE_DIR, 'templates')]

3. View

from django.shortcuts import render
from django.http import HttpResponse

def myView(request):
    return render(request, 'todo.html')

4. Add todo list in todo.html

<ul>
    <li> todo list 1
    <li> todo list 2
</ul>

5. Create model (sqlite)

models.py

class TodoItem(models.Model):
    content = models.TextField()

create migration file
```
> python manage.py makemigrations
```
to change the configuration of our database.

To execute the changing:
```
> python manage.py migrate
```

interact with the model

> python manage.py shell

>>> from todo.models import TodoItem

Create item

a = TodoItem(content = 'permanent todo item A')
a.save()

Retrive item
```
allItems = TodoItem.objects.all()
```
Delete item
```
allItems[0].delete()
```

6. Pass the items from model to view

view.py

from .models import TodoItem

def todoView(request):
    all_todo_items = TodoItem.objects.all()
    return render(request, 'todo.html',
    {'all_items': all_todo_items})

7. Pass the items from view to template

todo.html

<ul>
    {% for todo_item in all_items %}
        <li>{{ todo_item.content }}</li>
    {% endfor %}
</ul>

8. Configure urls.py

Add new template and function in urls.py

9. Create form

action="/addTodo" "/addTodo" is url string django will look for urlpatterns to find respective function (addTodo), the addTodo function is imported from view.py

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