django-adminfiles 0.3.4

Rendering references

These references need to be rendered at some point into whatever markup you ultimately want. The markup produced by the rendering is controlled by a Django template: adminfiles/render.html.

The default template produces an HTML img tag for images and a simple a link to other file types. It also respects three key-value options: class, which will be used as the the class attribute of the img or a tag; alt, which will be the image alt text (images only; if not provided upload.title is used for alt text); and title, which will override upload.title as the link text of the a tag (non-images only).

You can easily override this template with your own. The template is rendered with the following context:

upload

The FileUpload model instance whose slug field matches the reference. Useful attributes of this instance include upload.upload (a Django File object), upload.title, upload.description, upload.mime_type (first and second parts separately accessible as upload.content_type and upload.sub_type) and upload.is_image (True if upload.content_type is “image”). Images also have upload.height and upload.width available.

options

A dictionary of the key=value options in the reference.

If a reference is encountered with an invalid slug (no FileUpload found in the database with that slug), the value of the ADMINFILES_STRING_IF_NOT_FOUND setting is rendered instead (defaults to the empty string).

render_uploads template filter

django-adminfiles provides two methods for making the actual rendering happen. The simple method is a template filter: render_uploads. To use it, just load the adminfiles_tags tag library, and apply the render_uploads filter to your content field:

{% load adminfiles_tags %}

{{ post.content|render_uploads }}

The render_uploads filter just replaces any file upload references in the content with the rendered adminfiles/render.html template.

The filter also accepts an optional argument: the name of an alternate template to use for rendering each uploaded file reference. This allows several different renderings to be used in different circumstances:

{{ post.content|render_uploads:"custom_file_render.html" }}

pre-rendering at save time

In some cases, markup in content fields is pre-rendered when the model is saved, and stored in the database or cache. In this case, it may be preferable to also render the uploaded file references in that step, rather than re-rendering them every time the content is displayed in the template.

To use this approach, first you need to integrate the function adminfiles.utils.render_uploads into your existing content pre-rendering process, which should be automatically triggered by saving the content model.

The adminfiles.utils.render_uploads function takes a content string as its argument and returns the same string with all uploaded file references replaced, same as the template tag. It also accepts a template_name argument.

Integrating this function in the markup-rendering step is outside the scope of django-adminfiles. For instance, if using django-markitup with Markdown to process content markup, the MARKITUP_FILTER setting might point to a function like this:

from markdown import markdown
from adminfiles.utils import render_uploads

def markup_filter(markup):
    return markdown(render_uploads(markup))

Once this is done, set the ADMINFILES_USE_SIGNALS setting to True. Now django-adminfiles will automatically track all references to uploaded files in your content models. Anytime an uploaded file is changed, all content models which reference it will automatically be re-saved (and thus updated with the new uploaded file).

ADMINFILES_REF_START

Marker indicating the beginning of an uploaded-file reference in text content. Defaults to ‘<<<’.

If you set this to something insufficiently distinctive (a string that’s likely to show up otherwise in your content), all bets are off.

Special regex characters are escaped, thus you can safely set it to something like ‘[[[’, but you can’t do advanced regex magic with it.

ADMINFILES_REF_END

Marker indicating the end of an uploaded-file reference in text content. Defaults to ‘>>>’.

If you set this to something insufficiently distinctive (a string that’s likely to show up otherwise in your content), all bets are off.

Special regex characters are escaped, thus you can safely set it to something like ‘]]]’, but you can’t do advanced regex magic with it.

ADMINFILES_USE_SIGNALS

A boolean setting: should django-adminfiles track which content models reference which uploaded files, and re-save those content models whenever a referenced uploaded file changes?

Set this to True if you already pre-render markup in content fields at save time and want to render upload references at that same save-time pre-rendering step.

Defaults to False. If this setting doesn’t make sense to you, you can safely just leave it False and use the render_uploads template filter.

ADMINFILES_STRING_IF_NOT_FOUND

The string used to replace invalid uploaded file references (given slug not found). Defaults to u''.

ADMINFILES_MEDIA_URL

Some projects separate user-uploaded media at MEDIA_URL from static assets. If you keep static assets at a URL other than MEDIA_URL, just set ADMINFILES_MEDIA_URL to that URL, and make sure the contents of the adminfiles/media/adminfiles directory are available at ADMINFILES_MEDIA_URL/adminfiles/.

ADMINFILES_UPLOAD_TO

The upload_to argument that will be passed to the FileField on django-admin-upload’s FileUpload model; determines where django-adminfiles keeps its uploaded files, relative to MEDIA_URL. Can include strftime formatting codes as described in the Django documentation. By default, set to 'adminfiles'.

ADMINFILES_THUMB_ORDER

The ordering that will be applied to thumbnails displayed in the picker. Expects a tuple of field names, prefixed with - to indicate reverse ordering, same as “ordering” model Meta attribute. The default value is ('-upload_date'); thumbnails ordered by date uploaded, most recent first.

JQUERY_URL

django-adminfiles requires the jQuery Javascript library. By default, django-adminfiles links to the most recent minor version of jQuery 1.3 available at ajax.googleapis.com (via the URL http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js). If you wish to use a different version of jQuery, or host it yourself, set the JQUERY_URL setting. For example:

JQUERY_URL = 'jquery.min.js'

This will use the jQuery available at MEDIA_URL/jquery.min.js. Note that a relative JQUERY_URL is always relative to MEDIA_URL, it does not use ADMINFILES_MEDIA_URL.

tip (unreleased)

0.3.4 (2009.12.03)

• fix over-eager escaping in render_uploads template tag.

0.3.3 (2009.12.02)

• slugs for non-image files are inserted.

0.3.2 (2009.12.02)

• fix setup.py package_data so media and templates are installed from sdist.

0.3.1 (2009.11.25)

• fix setup.py so tests package is not installed.

0.3.0 (2009.11.23)

• initial release as django-adminfiles

• added docs and test suite

• added reference parsing & rendering, template filter, signal handling