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Decorating class-based views

This is a simplest approach possible. `as_view()` is replaced, so that it applies the given decorator before returning. In this approach, decorators are always put on top - that means it's not possible to have functions called in this order: B.dispatch, login_required, A.dispatch NOTE: By default this modifies the given class, so be careful when doing this: TemplateView = view_decorator(login_required)(TemplateView) Because it will modify the TemplateView class. Instead create a fresh class first and apply the decorator there. A shortcut for this is specifying the ``subclass`` argument. But this is also dangerous. Consider: @view_decorator(login_required, subclass=True) class MyView(View): def get_context_data(self): data = super(MyView, self).get_context_data() data["foo"] = "bar" return data This looks like a normal Python code, but there is a hidden infinite recursion, because of how `super()` works in Python 2.x; By the time `get_context_data()` is invoked, MyView refers to a subclass created in the decorator. super() looks at the next class in the MRO of MyView, which is the original MyView class we created, so it contains the `get_context_data()` method. Which is exactly the method that was just called. BOOM!

  • decorator
  • class-based-views
  • decorating
  • cbv
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Author: lqc
  • 0
  • 2

SSL Redirect Middleware

Snippet 240 is great, but it does not handle flatpages since flatpages are not technically a view. This operates on the request level, not the view level so it will handle flat pages. **Step 1** Add this class to your MIDDLEWARE_CLASSES **Step 2** Add an entry in settings.py which is a list of regex to match against urls that u want to have ssl: SSL_URLS = ( r'/login/', r'/home/', r'/super-sensitive-information/', )

  • middleware
  • ssl
  • redirect
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HTML Email with Inline Attachments (images)

This will allow you to attach HTML multipart emails (HTML/text) and use inline images. In my example, I'm attaching an image that's stored as an 'attachment' to an 'event.' The file name of the attachment is called "inline.jpg" and I'm referencing it in my HTML message. I'm also attaching a VCAL file (.ics) file that has some information about an associated event.

  • email
  • html
  • related
  • mixed
  • images
  • inline
  • multipart
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Keep settings.py in version control safely

Here is a trivial way to keep your Django project in shared version control or in a public repository without exposing settings that could have security implications, and without needing to modify settings.py for your local test or production environments on checkout. This is also a way to separate development settings from production settings, or to deploy the same code on multiple servers while only changing one site-specific "dotfile."

  • files
  • configuration
  • settings
  • development
  • debug
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More flexible "Partial Template"

This is an extension of the snippet http://www.djangosnippets.org/snippets/1302/ to make it a bit more flexible and been able pass more than one parameter to our "Partial Template". To use it you can {% partial_template template_name param1:variable1 param2:variable2 ... %} or: {% partial_template partials/mini_template.html item:data1 var2:"False" var3:"2*2" %}

  • template
  • templatetag
  • include
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Read more link

I couldn't find any code for a blog-style "Read more after the jump," so I made a custom filter. It will look for **<!--more-->** for the jump, like in Wordpress. In **settings.py** set **READ_MORE_TEXT** to what you want the text of the link to be. `READ_MORE_TEXT = 'Read more after the jump.'` When you call the filter in your template, pass it the absolute link of that entry. Of course, you have to have your **get_absolute_url** function defined in your model, but you should have that already, right? :P In this example **entry.body** is the content of the blog entry. `{% load blog_filters %}` `{{ entry.body|read_more:entry.get_absolute_url }}` If anyone has a better way to do this, it is, of course, welcome.

  • template
  • filter
  • blog
  • find
  • jump
  • read
  • more
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Add GET parameter tag

This is custom tag I wrote for myself for solving situations when you have filter form and page numbers in the same page. You want to change ?page=.. or add it if it doesn't exist to save filter form data while moving through pages. Usage: place this code in your application_dir/templatetags/add_url_parameter.py In template: {% load add_get_parameter %} <a href="{% add_get_paramater param1='const_value',param2=variable_in_context %}"> Link with modified params </a> It's required that you have 'django.core.context_processors.request' in TEMPLATE_CONTEXT_PROCESSORS URL: [http://django.mar.lt/2010/07/add-get-parameter-tag.html](http://django.mar.lt/2010/07/add-get-parameter-tag.html)

  • tag
  • parameters
  • GET
  • add
  • add_get_parameter
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{% exec %} template tag

usage: 1、 {% exec %} class A: def __call__(self): print "I Love Python!"; {% endexec %} 2、 {% exec from django.conf import settings; %} 3、 {% exec %} try: html = '' if book: html = book.TransToHtml().encode('utf8'); except Exception,msg: html = str(msg); if settings.TEMPLATE_DEBUG: open('c:/index.html','wb').write(html); {% endexec %}

  • exec
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Allow filtering and ordering by counts of related query results

I know you're thinking, *what the heck could that title mean?* I often find myself wanting to filter and order by the result of a COUNT(*) of a query using a method similar to the [entry_count example](http://www.djangoproject.com/documentation/db-api/#extra-select-none-where-none-params-none-tables-none). Writing this many times is tedious and hardcoding the table and column names made me cringe, I also wanted the counts to result from more complex queries. This is a method you can add to your custom Manager to do this easily. It's not an ideal syntax, but it's good for the amount of code required. Example: suppose we have some articles we want to filter and order by comments and visit logs to show the most popular... class ArticleManager(models.Manager): count_related = _count_related class Article(models.Model): pub_date = models.DateTimeField(auto_now_add=True) objects = ArticleManager() class Comment(models.Model): article = models.ForeignKey(Article) is_spam = models.BooleanField(default=False) class Visit(models.Model): article = models.ForeignKey(Article) referrer = models.URLField(verify_exists=False) search_query = models.CharField(maxlength=200) Notice how the ArticleManager is given the `count_related` method. Now you can find the most popular like so... Order by non-spam comments: Article.objects.count_related(Comment.objects.filter( is_spam=False)).order_by('-comment__count') Order by incoming non-search-engine links: Article.objects.count_related(Visit.objects.filter( referrer__isnull=False, search_query__isnull=True), 'links').order_by('-links') Order by total visits: Article.objects.count_related(Visit).order_by('-visit__count') Note: Doesn't work if `query` contains joins or for many-to-many relationships, but those could be made to work identically if there's demand.

  • sql
  • model
  • db
  • count
  • manager
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Get most-commented objects

This is a pretty straightforward bit of code for getting the most-commented objects of a particular model; just drop it into a custom manager for that model, and you should be good to go. Check the docstring for how to make it look at `Comment` instead of `FreeComment`.

  • managers
  • comments
  • popularity
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Create new variables in templates

Sometimes you want to create a temporal variable to store something or do anything you want with it, problem is that django template system doesn't provide this kind of feature. This template tag is just for that. Syntax:: {% assign [name] [value] %} This will create a context variable named [name] with a value of [value] [name] can be any identifier and [value] can be anything. If [value] is a callable, it will be called first and the returning result will be assigned to [name]. [value] can even be filtered. Example:: {% assign count 0 %} {% assign str "an string" %} {% assign number 10 %} {% assign list entry.get_related %} {% assign other_str "another"|capfirst %} {% ifequal count 0 %} ... {% endifequal %} {% ifequal str "an string" %} ... {% endifequal %} {% if list %} {% for item in list %} ... {% endfor %} {% endif %}

  • template
  • variable
  • assign
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roman numbers template filter

dirt and simple template filter to convert a number to its roman value. taken from dive into python http://www.diveintopython.org/unit_testing/stage_5.html

  • template
  • filter
  • filters
  • roman
  • numbers
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Roman Numeral Filter

Template filter to convert integer or long integer into roman numeral with support for upper and lower case numerals. Requires python-roman package on Debian which apparently comes from http://www.diveintopython.org/

  • django
  • python
  • roman-numerals
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