Mercurial > public > sg101
annotate downloads/signals.py @ 645:99f7917702ca
Fix 081a88b3bfc8, javascript resize of forum images.
Commit 081a88b3bfc8 broke those pages that loaded forums.js but did not load
the imagesLoaded jQuery extension. Now we have arranged it so that only the
forums topic view loads imagesLoaded and put the resizing javascript inline.
| author | Brian Neal <bgneal@gmail.com> |
|---|---|
| date | Mon, 11 Mar 2013 15:30:25 -0500 |
| parents | ee87ea74d46b |
| children | 929d0e637a37 |
| rev | line source |
|---|---|
| bgneal@203 | 1 """Signals for the downloads application. |
| bgneal@203 | 2 We use signals to compute the denormalized category counts whenever a download |
| bgneal@203 | 3 is saved.""" |
| bgneal@203 | 4 from django.db.models.signals import post_save |
| bgneal@203 | 5 from django.db.models.signals import post_delete |
| bgneal@203 | 6 |
| bgneal@203 | 7 from downloads.models import Category, Download |
| bgneal@203 | 8 |
| bgneal@203 | 9 |
| bgneal@203 | 10 def on_download_save(sender, **kwargs): |
| bgneal@203 | 11 """This function updates the count field for all categories. |
| bgneal@203 | 12 It is called whenever a download is saved via a signal. |
| bgneal@203 | 13 """ |
| bgneal@203 | 14 if kwargs['created']: |
| bgneal@203 | 15 # we only have to update the parent category |
| bgneal@203 | 16 download = kwargs['instance'] |
| bgneal@203 | 17 cat = download.category |
| bgneal@203 | 18 cat.count = Download.public_objects.filter(category=cat).count() |
| bgneal@203 | 19 cat.save() |
| bgneal@203 | 20 else: |
| bgneal@203 | 21 # update all categories just to be safe (an existing download could |
| bgneal@203 | 22 # have been moved from one category to another |
| bgneal@203 | 23 cats = Category.objects.all() |
| bgneal@203 | 24 for cat in cats: |
| bgneal@203 | 25 cat.count = Download.public_objects.filter(category=cat).count() |
| bgneal@203 | 26 cat.save() |
| bgneal@203 | 27 |
| bgneal@203 | 28 |
| bgneal@203 | 29 def on_download_delete(sender, **kwargs): |
| bgneal@203 | 30 """This function updates the count field for the download's parent |
| bgneal@203 | 31 category. It is called when a download is deleted via a signal. |
| bgneal@203 | 32 """ |
| bgneal@203 | 33 # update the parent category |
| bgneal@203 | 34 download = kwargs['instance'] |
| bgneal@203 | 35 cat = download.category |
| bgneal@203 | 36 cat.count = Download.public_objects.filter(category=cat).count() |
| bgneal@203 | 37 cat.save() |
| bgneal@203 | 38 |
| bgneal@203 | 39 |
| bgneal@260 | 40 post_save.connect(on_download_save, sender=Download, |
| bgneal@260 | 41 dispatch_uid='downloads.signals') |
| bgneal@260 | 42 post_delete.connect(on_download_delete, sender=Download, |
| bgneal@260 | 43 dispatch_uid='downloads.signals') |