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  • Book Overview & Buying Mastering Django: Core
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Mastering Django: Core

Mastering Django: Core

By : Nigel George
Buy this Book
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Mastering Django: Core

Mastering Django: Core

By: Nigel George
Buy this Book

Overview of this book

Mastering Django: Core is a completely revised and updated version of the original Django Book, written by Adrian Holovaty and Jacob Kaplan-Moss - the creators of Django. The main goal of this book is to make you a Django expert. By reading this book, you’ll learn the skills needed to develop powerful websites quickly, with code that is clean and easy to maintain. This book is also a programmer’s manual that provides complete coverage of the current Long Term Support (LTS) version of Django. For developers creating applications for commercial and business critical deployments, Mastering Django: Core provides a complete, up-to-date resource for Django 1.8LTS with a stable code-base, security fixes and support out to 2018.
Table of Contents (29 chapters)
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Preface
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Introduction to Django and Getting Started
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Introducing Django
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What's next?
2
2. Views and URLconfs
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2. Views and URLconfs
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Your first Django-powered page: Hello World
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Your second view: dynamic content
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URLconfs and loose coupling
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Your third view: dynamic URLs
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Django's pretty error pages
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What's next?
3
3. Templates
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3. Templates
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Template system basics
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Using the template system
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Dictionaries and contexts
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Basic template-tags and filters
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Philosophies and limitations
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Using templates in views
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Template loading
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render()
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Template subdirectories
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The include template tag
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Template inheritance
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What's next?
4
4. Models
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4. Models
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The "dumb" way to do database queries in views
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Configuring the database
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Your first app
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Defining Models in Python
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Basic data access
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What's next?
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5. The Django Admin Site
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5. The Django Admin Site
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Using the admin site
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Adding your models to the admin site
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Making fields optional
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Customizing field labels
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Custom model admin classes
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Users, groups, and permissions
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When and why to use the admin interface-and when not to
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What's next?
6
6. Forms
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6. Forms
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Getting data from the Request Object
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A simple form-handling example
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Improving our simple form-handling example
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Simple validation
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Making a contact form
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Tying form objects into views
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Changing how fields are rendered
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Setting a maximum length
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Setting initial values
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Custom validation rules
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Specifying labels
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Customizing form design
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What's next?
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7. Advanced Views and URLconfs
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7. Advanced Views and URLconfs
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URLconf Tips and Tricks
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Performance
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Error handling
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Including other URLconfs
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Passing extra options to view functions
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Reverse resolution of URLs
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Naming URL patterns
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URL namespaces
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What's next?
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8. Advanced Templates
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8. Advanced Templates
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Template language review
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Requestcontext and context processors
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Guidelines for writing our own context processors
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Automatic HTML escaping
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Inside Template loading
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Extending the template system
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Custom template tags and filters
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Advanced custom template tags
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What's next
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9. Advanced Models
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9. Advanced Models
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Related objects
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Managers
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Model methods
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Executing raw SQL queries
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Performing raw queries
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Executing custom SQL directly
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What's next?
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10. Generic Views
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10. Generic Views
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Generic views of objects
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Making "friendly" template contexts
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Adding extra context
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Viewing subsets of objects
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Dynamic filtering
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Performing extra work
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What's next?
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11. User Authentication in Django
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11. User Authentication in Django
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Overview
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Using the Django authentication system
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User objects
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Permissions and authorization
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Authentication in web requests
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Authentication views
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Authenticating data in templates
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Managing users in the admin
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Password management in Django
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Customizing authentication in Django
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Custom permissions
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Extending the existing user model
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Substituting a custom user model
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What's next?
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12. Testing in Django
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Introduction to testing
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Introducing automated testing
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Basic testing strategies
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Writing a test
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Creating a test
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Running tests
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Testing tools
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The test database
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Using different testing frameworks
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What's next?
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13. Deploying Django
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13. Deploying Django
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Preparing your codebase for production
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Critical settings
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Environment-specific settings
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HTTPS
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Performance optimizations
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Error reporting
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Using a virtualenv
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Using different settings for production
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Deploying Django to a production server
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Deploying Django with Apache and mod_wsgi
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Serving static files in production
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Scaling
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Performance tuning
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What's next?
14
14. Generating Non-HTML Content
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14. Generating Non-HTML Content
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The basics: views and MIME types
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Producing CSV
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Using the template system
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Other text-based formats
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Generating PDF
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Install ReportLab
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Write your view
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Complex PDF's
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Further resources
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Other possibilities
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The syndication feed framework
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The high-level framework
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The low-level framework
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The Sitemap framework
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What's next?
15
15. Django Sessions
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15. Django Sessions
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Enabling sessions
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Configuring the session engine
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Using Sessions in Views
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Session object guidelines
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Session serialization
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Setting test cookies
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Using sessions out of views
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When sessions are saved
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Browser-length sessions vs. persistent sessions
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Clearing the session store
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What's next
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16. Djangos Cache Framework
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16. Djangos Cache Framework
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Setting up the cache
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The per-site cache
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The per-view cache
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Template fragment caching
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The low-level cache API
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Downstream caches
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Using vary headers
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Controlling cache: using other headers
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What's next?
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17. Django Middleware
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17. Django Middleware
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Activating middleware
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Hooks and application order
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Writing your own middleware
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Available middleware
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Middleware ordering
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What's next?
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18. Internationalization
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18. Internationalization
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Definitions
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Translation
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Internationalization: in Python code
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Internationalization: In template code
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Internationalization: In Javascript code
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Internationalization: In URL patterns
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Localization: How to create language files
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Explicitly setting the active language
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Using translations outside views and templates
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Implementation notes
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What's next?
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19. Security in Django
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19. Security in Django
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Django's built in security features
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Additional security tips
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20. More on Installing Django
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20. More on Installing Django
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Running other databases
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Installing Django manually
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Upgrading Django
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Installing a Distribution-specific package
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Installing the development version
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What's next?
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21. Advanced Database Management
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21. Advanced Database Management
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General notes
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postgreSQL notes
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MySQL notes
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SQLite notes
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Oracle notes
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Using a 3rd-Party database backend
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Integrating Django with a legacy database
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What's next?
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A. Model Definition Reference
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A. Model Definition Reference
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Fields
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Universal field options
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Field attribute reference
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Relationships
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Model metadata options
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B. Database API Reference
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B. Database API Reference
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Creating objects
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Saving changes to objects
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Retrieving objects
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Complex lookups with Q objects
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Comparing objects
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Deleting objects
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Copying model instances
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Updating multiple objects at once
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Related objects
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Falling back to raw SQL
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C. Generic View Reference
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C. Generic View Reference
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Common arguments to generic views
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Simple generic views
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List/detail generic views
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Date-Based Generic Views
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Form handling with class-based views
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D. Settings
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D. Settings
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What's a settings file?
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Using settings in Python code
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Altering settings at runtime
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Security
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Creating your own settings
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DJANGO_SETTINGS_MODULE
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Using settings without setting DJANGO_SETTINGS_MODULE
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Available settings
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E. Built-in Template Tags and Filters
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E. Built-in Template Tags and Filters
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Built-in tags
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Built-in filters
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Internationalization tags and filters
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Other tags and filters libraries
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F. Request and Response Objects
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F. Request and Response Objects
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HttpRequest objects
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QueryDict objects
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HttpResponse objects
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JsonResponse Objects
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StreamingHttpResponse objects
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FileResponse objects
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Error views
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Customizing error views
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G. Developing Django with Visual Studio
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G. Developing Django with Visual Studio
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Installing Visual Studio
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Creating A Django project
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Django development in Visual Studio

Making fields optional

After you play around with the admin site for a while, you'll probably notice a limitation-the edit forms require every field to be filled out, whereas in many cases you'd want certain fields to be optional. Let's say, for example, that we want our Author model's email field to be optional-that is, a blank string should be allowed. In the real world, you might not have an e-mail address on file for every author.

To specify that the email field is optional, edit the Author model (which, as you'll recall from Chapter 4, Models, lives in mysite/books/models.py). Simply add blank=True to the email field, like so:

class Author(models.Model): 
    first_name = models.CharField(max_length=30) 
    last_name = models.CharField(max_length=40) 
    email = models.EmailField(blank=True)

This tells Django that a blank value is indeed allowed for author's e-mail addresses. By default, all fields have blank=False, which means blank values are not allowed.

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