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Custom Filter using filterspecs

This snippet is based on [#1051](http://djangosnippets.org/snippets/1051/). It adds filtering by existence of at least one related object. It is an example of how to simply subclass the FilterSpec class, in order to build a custom Filter. The comment in the code contains instructions on how to implement it in a real project.

  • django
  • filterspecs
  • custom filters
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Get email and push on couchdb - Model

view/admin.py ` def reactor(request): context = { 'email': read_mailbox() } return render_to_response(_lookup_template('dashboard'), context, context_instance=RequestContext(request)) ` **_Design all.js** ` function (doc) { if (doc.doc_type == 'MailArchive') { emit(doc._id, doc); } } ` **reduce.js** `_count`

  • email
  • couchdb
  • couchdbkit
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Generate a dineromail form in python

This is the code we use on bandtastic.me to build a html that sends users to dineromail to pay with. This code builds a form thats ready to send multiple items.

  • django
  • python
  • dineromail
  • express checkout
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get and image object

I use this snippet to save images to my imagefields on django models. This uses the very awesome requests library, so install it first pip install requests You probably want to have this be done on a celery queu, if the image is big enough.

  • imagefield
  • save file
  • save url
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Horizontal RadioSelect widget

The problem with Django's default Radio button widget is that it puts the buttons in a vertical format and the documentation is somewhat silent on how to make them horizontal. If you are dealing with a long list of buttons then veritical is probably the way to go but if you are dealing with "YES/NO" situation or any other boolean choice then you will probably want them horizontal. Basically I just took the code and even the explanation from here: https://wikis.utexas.edu/display/~bm6432/Django-Modifying+RadioSelect+Widget+to+have+horizontal+buttons

  • widget
  • radioselect
  • horizontal
  • radio
  • renderer
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Admin Download as CSV File

This function downloads selected rows to CSV file. The snippet is based on snippet 1697 and 2020. This function downloads all columns given in the list_display, including callable items.

  • admin
  • csv
  • export csv
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Coalesce for F()

Updating fields that allow for NULLs must take care about those NULLs. Use case: `Message.objects.filter(id=1).update(price=CF('price', 0) + 7)` `Message.objects.filter(id=1).update(status=CF('status') // 's')` Works for postgres. Supposedly works for mysql. Didn't test with other backends.

  • coalesce
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Async PIL resize of images

Call resize_image to replace the image with a resized and normalized version of itself. I recommend doing this with celery, but you could also hook it up to the admin interface if you're not impatient.

  • Images
  • PIL
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SASS/SCSS include template tag.

You'll need to `pip install pyScss` first. Converts on the fly, so you won't want to use this for much more than just testing. Usage in a template: {% load sass %} {% include_sass "disclosures/css/base.scss" %} {% include_sass "disclosures/css/grid.scss" %}

  • template
  • tag
  • tags
  • scss
  • sass
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