Leggera/RSA-DEMO

RSA-DEMO

To run the server:

pip3 install virtualenv

. env/bin/activate

pip3 install django

python3 ./manage.py runserver

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Tutorial for making a website: https://dzone.com/articles/bounty-tutorial-developing-a-basic-web-application

pip3 install virtualenv

. env/bin/activate

pip3 install django

python3 manage.py migrate

python3 ./manage.py createsuperuser (rsa, rsablockchain)

python3 ./manage.py runserver

python3 ./manage.py startapp demo

in the website/settings.py: INSTALLED_APPS = [ 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'website', 'demo' ]

in demo/views.py: from django.http import HttpResponse

def hello(request): return HttpResponse('hello')

in website/urls.py: from demo import views

urlpatterns = [ path('admin/', admin.site.urls), path('', views.hello, name='hello') ]

in demo/views.py: def whoami(request): sex = request.GET['sex'] name = request.GET['name'] response = 'You are ' + name + ' and of sex ' + sex return HttpResponse(response)

in website/urls.py: urlpatterns = [ path('admin/', admin.site.urls), path('', views.hello, name='hello'), path('whoami/', views.whoami), ]

To open the page run server and request url http://localhost:8000/whoami/?name=greg&sex=male

Adding posts:

Step 1. Creating a blog post model

In demo/models.py: from django.conf import settings from django.db import models from django.utils import timezone

class Post(models.Model): author = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE) title = models.CharField(max_length=200) text = models.TextField() created_date = models.DateTimeField(default=timezone.now) published_date = models.DateTimeField(blank=True, null=True)

def publish(self):
    self.published_date = timezone.now()
    self.save()

def __str__(self):
    return self.title

Explaining =========== class Post(models.Model): – this line defines our model (it is an object).

class is a special keyword that indicates that we are defining an object. Post is the name of our model. We can give it a different name (but we must avoid special characters and whitespace). Always start a class name with an uppercase letter. models.Model means that the Post is a Django Model, so Django knows that it should be saved in the database.

• models.CharField – this is how you define text with a limited number of characters.
• models.TextField – this is for long text without a limit. Sounds ideal for blog post content, right?
• models.DateTimeField – this is a date and time.
• models.ForeignKey – this is a link to another model.

Step 2. Create tables for models in your database

python3 manage.py makemigrations demo

python3 manage.py migrate demo

Step 2. Render

In demo/views.py

def post_list(request): return render(request, 'blog/post_list.html', {})

Step 3. Create template In website/urls.py:

urlpatterns = [ path('', views.post_list, name='post_list'), ]

In demo/views.py:

def post_list(request): return render(request, 'blog/post_list.html', {})

Now create a template to display:

Create demo/templates/demo

In demo/templates/demo/post_list.html

Hi there!

It works!

Step 4. Adding dynamic

In demo/views.py:

add line 'from .models import Post'

def post_list(request): posts = Post.objects.filter(published_date__lte=timezone.now()).order_by('published_date') return render(request, 'blog/post_list.html', {})

In demo/templates/demo/post_list.html: {{ posts }}

Forms.

1. Create forms.py file in demo directory

2. In demo/forms.py:

   from django import forms

   from .models import Post

   class PostForm(forms.ModelForm):

    class Meta:
    model = Post
    fields = ('title', 'text',)
   

3. In demo/templates/demo/base.html

add line

4. In website/urls.py:

add line path('post/new', views.post_new, name='post_new'),

5. In demo/views.py

from .forms import PostForm

def post_new(request): form = PostForm() return render(request, 'blog/post_edit.html', {'form': form})

6. In demo/templates/demo/post_edit.html:

{% extends 'blog/base.html' %}

{% block content %}

New post

{% csrf_token %} {{ form.as_p }} Save {% endblock %}

7. Saving/proccessing the form

In demo/views.py: from django.shortcuts import redirect

def post_new(request): if request.method == "POST": form = PostForm(request.POST) if form.is_valid(): post = form.save(commit=False) post.author = request.user post.published_date = timezone.now() post.save() return redirect('post_detail', pk=post.pk) else: form = PostForm() return render(request, 'blog/post_edit.html', {'form': form})