Additional Change List Columns

Ever wanted to add a link or two at the end of a row in a model's change list? Say you had a model for people and a model for registrations or blog posts and you want to modify the people change list so it has a link to, say all of the registrations or blog posts for the person. Well, Django provides half of the solution already in that the example registration change_list already handles the display of all registrations tied to that person. For example, the url `/admin/registrations/registration/?person__id__exact=121` gets you to a filtered list of registrations for the person with the id of 121. This is the same url used if you use list_filter in your model definition (though setting list_filter is not required for what we're doing). Okay, so to add a link to the end of each person row in the change list, you need to create a template tag similar to "person_result_list" in the code. There, I've given an example that adds two links. Each dictionary in additional_links needs to have at least a text, sortable, and url_template attribute. The text attribute is what will display as the header to the column. url_template will be fed the id of the row object (in this example, a person id), which you can use to construct the link for each row. You could extend this if you wish, though all I ever need is the id. And the last step is to use your new template tag in a modified change_list.html in place of the default result_list tag. The example at the bottom of the code shows an example usage of the tag. Hope this makes sense and is helpful to someone!

• template
• admin
• tags
• change_list

Thu 12 Jun 2014 Read More

Case-insensitive lookup by default

I wanted lookups on tags to be case insensitive by default, so that things like Tag.objects.get(name='Tag') would return any similar tags (ignoring case differences), i.e. `<Tag: tag>`. This snippet makes lookup on the 'name' field case-insensitive by default, although case-sensitive lookups can still be achieved with 'name__exact'. Methods like get_or_create will work as expected and be case-insensitive.

• model
• tags
• tagging
• manager
• case-insensitive
• iexact
• queryset

Sun 11 Jul 2010 Read More

E-mail quoting filters and tags

Ttemplates and filters for quoting e-mails in templates. The `quoted_email` tag takes a template, renders it and quotes the result. The `quote_text` filter puts one or more levels of quotes around the passed text.

• filter
• tag
• filters
• email
• tags
• quoting

Sun 11 Jul 2010 Read More

a template tag to invoke a method on an object with a variable

The django templating language is quite nice, and specifically limited to guide people in to making their business logic in the view, not in the template itself. Sometimes it can be difficult to do certain things in the template even though it seems like the most appropriate place to do this. I have an application that is heavily influenced by the user that is logged in in several ways. For example let us say I have a list of forums. Each forum has several discussions full of posts. This system of forums and discussions has permissions such that some users can not see some entities. Now, I can produce in the view the query set of what forums a user is allowed to see, and I want this list to display the latest post in each of those forums, but I have to restrict that to the posts that they can see. Easy enough, I have a method on the Forum object that takes a user object and does the appropriate filter to return the latest post that the user can see. The trick is the template is passed the query set of forums, and then iterates through them using the template language. How can it invoke the method on the forum for the latest post that needs the 'user' variable from the template context? The template language lets me say 'forum.latest_post' but I need to pass in 'user'. 'forum.latest_post(user)' does not work because the template language does not allow it. This tag lets me specify an object, the method on that object to call, and the variable to pass to that method. It is not the prettiest thing but with this add on you can do: `{% method_arg forum latest_post user as post %}`

• tags

Sun 11 Jul 2010 Read More

django-tagging clouds template tag

template tag for producing tag clouds for a given model, using django-tagging application: http://code.google.com/p/django-tagging/ Sample: http://skam.webfactional.com/tags/ Usage: {% tags_cloud_for_model articles.Article as object_list %} {% tags_cloud_for_model articles.Article as object_list step 6 %}

• template
• tag
• tags
• tagging
• templatetags
• clouds

Wed 17 Jan 2018 Read More

WordWrap template tag

Basically a clone of the default "wrap" filter. I use it to generate plaintext e-mail that has to be broken at 75 characters. {% wordwrap 80 %} Some text here, including other template tags, includes, etc. {% endwordwrap %} I prefer this over the {% filter wordwrap:80 %} as my template (e-mail) writers keep screwing it up.

• template
• tags
• wordwrap

Sun 11 Jul 2010 Read More

Make tags easier with properties

Jonathan Buchanan's [Django tagging](http://code.google.com/p/django-tagging/) application is the best thing since sliced bread, and makes adding generic tagging to any model trivially easy. But you can make it just a tiny bit easier to use by setting up a property on your model for handling the tags. Once you've set this up, you can access and set tags in a fairly natural way: >>> obj = MyModel.objects.get(pk=1) >>> obj.tags = 'foo bar' >>> obj.tags [<Tag: foo>, <Tag: bar>] And remember that `obj.tags` will return a `QuerySet`, so you can do filtering on it.

• tags
• properties

Sun 14 Jun 2015 Read More