Django provides the {% include %} template tag that allows one template to render and include another template. However, this template tag raises an error if you try to include a template that doesn't exist in the filesystem. In this recipe, we will create a {% try_to_include %} template tag that includes another template, if it exists, and fails silently by rendering as an empty string otherwise.
Creating a template tag to include a template, if it exists
by Aidas Bendoraitis,
Jake Kronika
Django 3 Web Development Cookbook - Fourth Edition
- Title Page
- Copyright and Credits
- About Packt
- Contributors
- Preface
- Getting Started with Django 3.0
- Introduction
- Technical requirements
- Working with a virtual environment
- Creating a project file structure
- Handling project dependencies with pip
- Configuring settings for development, testing, staging, and production environments
- Defining relative paths in the settings
- Handling sensitive settings
- Including external dependencies in your project
- Setting up STATIC_URL dynamically
- Setting UTF-8 as the default encoding for the MySQL configuration
- Creating the Git ignore file
- Deleting Python-compiled files
- Respecting the import order in Python files
- Creating an app configuration
- Defining overwritable app settings
- Working with Docker containers for Django, Gunicorn, Nginx, and PostgreSQL
- Models and Database Structure
- Introduction
- Technical requirements
- Using model mixins
- Creating a model mixin with URL-related methods
- Creating a model mixin to handle creation and modification dates
- Creating a model mixin to take care of meta tags
- Creating a model mixin to handle generic relations
- Handling multilingual fields
- Working with model translation tables
- Avoiding circular dependencies
- Adding database constraints
- Using migrations
- Changing a foreign key to the many-to-many field
- Forms and Views
- Introduction
- Technical requirements
- Creating an app with CRUDL functions
- Saving the author of a model instance
- Uploading images
- Creating a form layout with custom templates
- Creating a form layout with django-crispy-forms
- Working with formsets
- Filtering object lists
- Managing paginated lists
- Composing class-based views
- Providing Open Graph and Twitter Card data
- Providing schema.org vocabularies
- Generating PDF documents
- Implementing a multilingual search with Haystack and Whoosh
- Implementing a multilingual search with Elasticsearch DSL
- Templates and JavaScript
- Introduction
- Technical requirements
- Arranging the base.html template
- Using Django Sekizai
- Exposing settings in JavaScript
- Using HTML5 data attributes
- Providing responsive images
- Implementing a continuous scrolling
- Opening object details in a modal dialog
- Implementing the Like widget
- Uploading images via Ajax
- Custom Template Filters and Tags
- Introduction
- Technical requirements
- Following conventions for your own template filters and tags
- Creating a template filter to show how many days have passed since a post was published
- Creating a template filter to extract the first media object
- Creating a template filter to humanize URLs
- Creating a template tag to include a template, if it exists
- Creating a template tag to load a QuerySet in a template
- Creating a template tag to parse content as a template
- Creating template tags to modify request query parameters
- Model Administration
- Security and Performance
- Introduction
- Technical requirements
- Making forms secure from Cross-Site Request Forgery (CSRF)
- Making requests secure with Content Security Policy (CSP)
- Using django-admin-honeypot
- Implementing password validation
- Downloading authorized files
- Adding a dynamic watermark to images
- Authenticating with Auth0
- Caching the method return value
- Using Memcached to cache Django views
- Using Redis to cache Django views
- Hierarchical Structures
- Introduction
- Technical requirements
- Creating hierarchical categories with django-mptt
- Creating a category administration interface with django-mptt-admin
- Rendering categories in a template with django-mptt
- Using a single selection field to choose a category in forms with django-mptt
- Using a checkbox list to choose multiple categories in forms with django-mptt
- Creating hierarchical categories with django-treebeard
- Creating a basic category administration interface with django-treebeard
- Importing and Exporting Data
- Introduction
- Technical requirements
- Importing data from a local CSV file
- Importing data from a local Excel file
- Importing data from an external JSON file
- Importing data from an external XML file
- Preparing paginated sitemaps for search engines
- Creating filterable RSS feeds
- Using Django REST framework to create an API
- Bells and Whistles
- Introduction
- Technical requirements
- Using the Django shell
- Using database query expressions
- Monkey patching the slugify() function for better internationalization support
- Toggling the Debug toolbar
- Using ThreadLocalMiddleware
- Using signals to notify administrators about new entries
- Checking for missing settings
- Testing
- Deployment
- Introduction
- Technical requirements
- Releasing a reusable Django app
- Deploying on Apache with mod_wsgi for the staging environment
- Deploying on Apache with mod_wsgi for the production environment
- Deploying on Nginx and Gunicorn for the staging environment
- Deploying on Nginx and Gunicorn for the production environment
- Maintenance
- Other Books You May Enjoy
Creating a template tag to include a template, if it exists
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