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Tutorial: Create Views and Route your URLS
===========================================
[Demonstration time: 10 mins 50 s (0.85 ~ 85%) | Total time: 12 mins 42 s]
Slide 1 [00:08 | 00:08]
------------
Title Slide
**Creating Views and Routing URLs**
Slide 2 [00:12 | 00:20]
--------------
**Learning Objectives**
In this tutorial, we will learn to;
- Create a django view
- Create a django template
- Create a url routing scheme
Slide 3 [00:11 | 00:31]
---------------
**System Requirements**
- Ubuntu 16.10
- Python 3.5 or higher version
- python3.4-venv
Slide 4 [00:11 | 00:42]
---------------
**Pre-requisites**
In order to follow this tutorial, you need to know;
- how to create models in django
- If not, see the relevant django tutorial on http://spoken-tutorial.org
Slide 5 [00:10 | 00:52]
------------
**What is a View**
- A view is code that accepts a request
- It processes the request and sends back a response
Demonstration [03:00 | 03:52]
-----------
**Creating a View**
Edit the /blog/views.py
# /blog/views.py
from django.http import HttpResponse
from .models import Blog, Article
def get_blogs(request):
blogs = Blog.objects.all() # This is called a query
for blog in blogs:
articles = Article.objects.filter(blog=blog)
response = 'Blog: {0}\n\n'.format(b) + '\n'.join([article.title for article in articles])
return HttpResponse(response)
- Narrator Notes: Please state that Django queries will be explained later in the series,
and should explain the above code.
Demonstration [03:50 | 07:42]
-----------
**Add URL routing to URLConf**
Now change the /myproject/urls.py so that the project knows which urls file to call
This is called the URL Dispatcher
# /myproject/urls.py
from django.conf.urls import include, url
from django.contrib import admin
urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'^$', views.index, name='index') # Add this line
]
- Run the django server using command:
- python manage.py runserver
- **Narrator Note**: Show the web browser to the user
- Go to the url http://localhost:8000/blogs/ and show the output.
- You will see the article that you had added in the tutorial 3
Slide 6 [00:18 | 08:00]
------------
**What is a Django Template**
- We have hardcoded the output in the view
- What if we want the displayed html to change dynamically?
- Use a 'template' HTML file
- Template HTML files contain Django template tags that act like variables
- Django replaces these tags in the HTML file with dynamic data obtained from views
Demonstration [03:00 | 11:00]
----------------
**How to create a template**
- Create a directory called *templates* in blog directory (/blog/templates)
- cd blogs
- mkdir templates
- Create a directory called *blog* within the *templates* directory
- cd templates
- mkdir blog
In this directory create an *blogs.html* file and add the below code
# /blog/templates/blog/blogs.html
{% if articles %}
<ul>
{% for article in articles %}
<li>{{ article.title }} | Blog: {{ article.blog.name}}</li>
{% endfor %}
</ul>
{% else %}
<p>No Blog articles are available.</p>
{% endif %}
- We created a django template using an HTML file
- The Django templates give the user limited programming logic capabilities like variables, if-else & for loops
This is an if-else statement in Django templates
{% if %}
...
{% else %}
...
{% endif %}
This is a for loop
{% for var in my_list %}
...
{% endfor %}
- variables and objects are represented as {{ my_variable }}
- *Narrator's note* We will discuss more about Django templating later in the series
Demonstration [01:00 | 12:00]
----------------
Now let's modify the blog/views.py as follows
from django.http import HttpResponse
from django.shortcuts import render
from .models import Blog, Article
def index(request):
article_list = Articles.objects.all()
context = {'article_list': article_list}
return render(request, 'blog/index.html', context)
- Run the django server
- Access the link localhost:8000/blogs/
*** With this we come to the end of the tutorial***
----------------------------------------------------
*** Add concluding slides and assignment***[00:42 | 12:42 ]
-------------------------------------------
|
