From 8a67d61e97592a496f526399aebf6aa39e7138b0 Mon Sep 17 00:00:00 2001
From: prathamesh
Date: Sat, 14 Apr 2018 06:06:20 +0530
Subject: changed sequence

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 tutorial_8_django_forms/slides.md | 215 --------------------------------------
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-Slide 1 [00:08 | 00:08]
-------------
-Title Slide
-**Creating Forms to edit the Blog**
-
-Slide 2 [00:12 | 00:20]
---------------
-
-**Learning Objectives**
-
-In this tutorial, we will learn to;
-  - Create a new form
-  - Create a new view to handle form submission
-
-Slide 3 [00:11 | 00:31]
----------------
-
-**System Requirements**
-  - Ubuntu 16.10
-  - Python 3.5 or higher version
-  - python3.4-venv
-
-Slide 4:
-----------------
-
-**What is a Form?**
-
-- In HTML, a form is a collection of elements inside <form>...</form>
-- Allow a visitor to do things like;
-    - enter text
-    - select options
-    - manipulate objects or controls, and so on,
-- Send information back to the server
-
-Slide 5
-----------------
-
-**Django Forms**
-
-- Django provides inbuilt libraries to help you build forms easily
-
-
-Slide 6
------------------
-
-**What is POST Request**
-
-- A form is what the user sees when the application is storing new *or* updating/deleting existing data on a server,
-- In the backend this storage, updation or deletion is done using a POST request
-- A POST request method requests that a web server accept the data enclosed in the body of the request message
-
-Slide 7
-----------------
-
-**Creating a New Form for Blogs**
-
-- Create a forms.py in the ```blog``` and add the code
-
-      class BlogForm(ModelForm):
-          class Meta:
-              model = Blog
-              fields = ['name', 'created_on']
-        
-      class ArticleForm(ModelForm):
-          class Meta:
-              model = Article
-              fields = ['created_on', 'title', 'body', 'draft']
-
-Slide 8
-----------------
-
-**Adding a new view to handle the form**
-
-- Let's add a new view to add a new blog or edit an existing blog
-- To do this add the following code to the ```views.py``` in the ```blog```directory
-
-      from django.http import HttpResponse, HttpResponseNotFound
-      from .forms import BlogForm, ArticleForm
-
-      def edit_blog(request, blog_id):
-      """
-      This view adds a new or edits an existing blog
-      """
-          if blog_id:
-              blog = Blog.objects.get(id=blog_id)
-          else:
-              blog = Blog()
-          if request.method == 'GET':
-              blog_form = BlogForm(instance=blog)
-              context = {'form': blog_form, 'blog': blog}
-              return render(request, 'blog/blog_form.html', context)
-          elif request.method == 'POST':
-              form = BlogForm(request.POST, instance=blog)
-              if form.is_valid():
-                  form.save()
-                  return redirect('index')
-              else:
-                  return redirect('edit_blog')
-                  
-      def edit_article(request, blog_id, article_id):
-      """
-      This view adds a new or edits an existing article
-      """
-          blog = Blog.objects.get(id=blog_id)
-          if article_id:
-              article = Article.objects.get(id=article_id)
-          else:
-              article = Article(blog=blog)
-          if request.method == 'GET':
-              article_form = ArticleForm(instance=article)
-              context = {'form': article_form, 'article': article}
-              return render(request, 'blog/article_form.html', context)
-          elif request.method == 'POST':
-              if article == None:
-                  form = ArticleForm(request.POST, instance=article)
-              else:
-                  form = ArticleForm(instance=article)
-              if form.is_valid():
-                  form.save()
-                  return redirect('index')
-              else:
-                  return redirect('edit_article')
-
-Slide 8
------------------
-
-**Creating a Template for the view**
-
-- Create a template ```edit_blog.html``` at ```/blog/templates/blog/edit_blog.html``` to look like below
-
-        <html>
-        <body>
-        {% if form %}
-            <form action="/blog/edit_blogs/{{ blog.id }}" method="post">
-                {% csrf_token %}
-                    {{ form }}
-                <input type="submit" value="Submit" />
-            </form>
-        {% endif %}
-        </body>
-        </html>
-        
-- Create a template ```edit_article.html``` at ```/blog/templates/blog/edit_article.html``` to look like below
-
-        <html>
-        <body>
-        {% if form %}
-            <form action="/blog/edit_articles/{{ blog.id }}/{{ article.id}}" method="post">
-                {% csrf_token %}
-                    {{ form }}
-                <input type="submit" value="Submit" />
-            </form>
-        {% endif %}
-        </body>
-        </html>
-
-Slide 9
------------------
-
-**Add URLs for editing blogs and articles**
-
-Modify the urls located in the blogs folder
-
-    # /blogs/urls.py
-    from django.conf.urls import patterns, url
-    from blog import urls
-
-    urlpatterns = [
-        url(r'^(?P<username>\w+)/list/$', views.get_blogs, name='blogs'),
-        url(r'^/edit_blogs/(?P<blog_id>\d+)/$', views.edit_blogs, name='edit_blogs'),
-        url(r'^/edit_articles/(?P<blog_id>\d+)/(?P<article_id>\d+)$', views.edit_articles, name='edit_articles')
-    ]
-
-Slide 10:
------------------
-
-**Edit Templates to add new URL redirect**
-
-- Edit the ```blogs.html``` as follows;
-
-   # /blog/templates/blog/blogs.html
-    
-    <html>
-    <body>
-    <h2><a href='/blog/edit_blogs/'>Add New Blog</a></h2>
-    {% if blogs %}
-        <h2><a href='/blog/edit_articles/'>Add New Article</a></h2>
-        <ul>
-        {% for blog in blogs %}
-            <li>{{ blog.name}} <a href='/blog/edit_blogs/{{ blog.id }}'>[Edit]</a></li>
-                <ul>
-                {% for article in blog.article_set %}
-                    <li><a href='/blog/article/{{ article.id }}'>{{ article.title }}</a> <a href='blog/edit_article/{{ blog.id}}/{{ article.id }}'>[Edit]</a></li>
-                {% endfor %}
-                </ul>
-        {% endfor %}
-        </ul>
-    {% else %}
-        <p>No Blogs are available.</p>
-    {% endif %}
-    </body>
-    </html>
-
-
-Slide 11
------------------
-
-**Testing the new view and form**
-
-Test the new view
-
-- Activate the virtual environment
-- Run the Django test server using the command python manage.py runserver
-- Open the web browser and go to http://127.0.0.1:8000/blog/edit_blog/1
-- You will be taken to the new view with the form.
-- 
cgit