On Tue, Nov 12, 2013 at 9:35 AM, info rekal <i...@rekal-media.com> wrote:
> Hello,
>
> We are running Django 1.5.1 with some ajax on the front end
> (http://goo.gl/RuofnO) that allows visitors to add certain pages to their
> favorites list (similar in functionality to a shopping cart). The 'Save to
> Favorites' does not seem to function correctly when the cache middleware's
> are enabled:
>
> 'django.middleware.cache.UpdateCacheMiddleware',
> 'django.middleware.cache.FetchFromCacheMiddleware',
>
> If I leave the above middleware's disabled, the ajax 'Save to Favorites"
> works successfully;
>
> However when caching middlewares are enabled, it may allow you to add one
> property to the list, but after you will still get 'Favorite Added' message
> upon clicking 'Save to Favorites' but upon viewing the list you find nothing
> was added to the list.
>
> I tried applying never cache to the view responsible for the ajax response
> in attempt exclude this part
> of the page from cache, but this did not seem to help any.
never_cache is a view decorator. This is not a view - views return
HttpResponse subclasses.
>
>> #from django.views.decorators.cache import never_cache
>>
>>
>>
>> #@never_cache
>> def build_favorites(session_favorites):
>> listing = ListingAPI()
>> favorites = []
>> for prop_type, _id, beds in session_favorites:
>> if prop_type == 'robo':
>> obj = Property.objects.get(id=_id)
>> if beds == '1':
>> price = obj.one_bed_price
>> elif beds == '2':
>> price = obj.two_bed_price
>> elif beds == '3':
>> price = obj.three_bed_price
>> else:
>> obj = listing.get(_id).get('listing', {})
>> price = obj.get('price','USD')
>>
>> favorites.append((prop_type, obj, beds, price))
>>
>> return favorites
>
>
>
> Does anyone have any ideas on why the 'Save to Favorites' functionality
> breaks when caching is enabled?
Check the javascript that submits this request. I'm guessing you are
submitting a GET request that is not idempotent - that is, it changes
the database. Submit it as a POST request, submit arguments to the
request in the POST arguments, not as part of the URL.
Cheers
Tom
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