[EMAIL PROTECTED] wrote:
> I've tried low-level api, and must be missing something:
>
> class RideNode(template.Node):
> def __init__(self, varname):
> self.varname = varname
>
> def render(self, context):
> if cache.get('rod'):
> context[self.varname] = cache.get('rod')
> else:
> ride =
> Ride.objects.filter(site=settings.SITE_ID).order_by('?')[:1]
> cache.set('rod', ride, 30)
> context[self.varname] = cache.get('rod')
> return ''
I'm not 100% familiar with Template Tags, but I thought you'd want to do
the "work" once in init instead of every time in render.
You're not doing it low-level enough :) You're trying to put a QuerySet
into the cache. I think you want a single random Ride that would be
Ride.objects.filter(site=settings.SITE_ID).order_by('?')[0]
Even with a Ride instance instead of a QuerySet you need to pickle it to
store in cache and unpickle when you pull it out. (I don't *think* that
happens automatically)
Instead I'd store the specific values of Ride I want to use.
cache.set('rod_title', ride_title, 24*60*60)
cache.set('rod_img_url', ride_img_url, 24*60*60)
The template tags I've created in past tended to create snippets of html
instead of just setting context vars. I'd stuff that "rendered" html
into the cache.
This is code I've used to do things of day/hour in views. It could be
adapted to template tags.
def cache_context(keys, ttl, ttw=60):
"""
Decorator to cache a set of context vars as one unit
Function decorated should return a dict/RequestContext so that keys
== func().keys() or None.
@param keys: keys of context vars, a list
@param ttl: time to live, in seconds, how long results from
decorated function are cached
@param ttw: time to wait, in seconds, time between calls to
decorated function when it returns None
"""
def decorate(func):
def fast(context, func=func, keys=keys, ttl=ttl, ttw=ttw):
data = cache.get_many(keys)
if len(data) == len(keys):
context.update(data)
else:
data = func()
if data is None:
for k in keys:
cache.set(k, "", ttw)
else:
context.update(data)
for k in keys:
cache.set(k, data.get(k, ""), ttl)
return fast
return decorate
# cache for day, check every hour
@cache_context(["featured_blog_html",], 3600*24, 3600)
def get_featured_blog_context():
"""
If blog written within a week. blog_block template renderd to html
"""
try:
a_week_ago = datetime.now() - timedelta(days=7)
entry = Entry.objects.filter(draft=False,
date__gte=a_week_ago).latest()
html = render_to_string("blog/entry_block.html", dict(entry=entry))
logging.info("New featured blog: %s" % entry.title)
return {"featured_blog_html": html}
except Entry.DoesNotExist:
pass
def index(request):
context = RequestContext(request)
get_featured_blog_context(context)
get_featured_foo(context)
get_featured_bar(context)
return render_to_response("main/index.html", context)
--
Norman J. Harman Jr. 512 912-5939
Technology Solutions Group, Austin American-Statesman
___________________________________________________________________________
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