我正在尝试使模型上的视图级缓存过期post_save（这是通过设置的https://docs.djangoproject.com/en/1.3/topics/cache/?from=olddocs#the-per-view-cache https://docs.djangoproject.com/en/1.3/topics/cache/?from=olddocs#the-per-view-cache）。我做了一些谷歌搜索，并在这里找到了这个答案：使 Django 中的视图缓存过期？ https://stackoverflow.com/questions/2268417/expire-a-view-cache-in-django但这对我不起作用。
我在 freenode 上的 #django 房间询问了一下，一致认为这可能是由于1.3 中最近进行的缓存更改 https://docs.djangoproject.com/en/1.3/releases/1.3/#caching-changes
有谁知道如何清除已关闭的模型的缓存条目get_absolute_url()?
我想到了！
干杯ilvar https://stackoverflow.com/users/1215136/ilvar为我指明了正确的方向。我的实现如下。我创建了一个名为cache_key并将 post_save 接收器添加到模型的子类中，我需要在更新模型后清除其视图级缓存。随时欢迎提出改进建议！
from django.conf import settings
from django.core.cache import cache
from django.db.models.signals import post_save
from django.http import HttpRequest
from django.utils.cache import _generate_cache_header_key
from someapp.models import BaseModelofThisClass
class SomeModel(BaseModelofThisClass):
...
@property
def cache_key(self):
# Create a fake request object
request = HttpRequest()
# Set the request method
request.method = "GET"
# Set the request path to be this object's permalink.
request.path = self.get_absolute_url()
# Grab the key prefix (if it exists) from settings
key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
# Generate this object's cache key using django's key generator
key = _generate_cache_header_key(key_prefix, request)
# This is a bit hacky but necessary as I don't know how to do it
# properly otherwise. While generating a cache header key, django
# uses the language of the HttpRequest() object as part of the
# string. The fake request object, by default, uses
# settings.LANGUAGE_CODE as it's language (in my case, 'en-us')
# while the true request objects that are used in building views
# use settings.LANGUAGES ('en'). Instead of replacing the segment
# of the string after the fact it would be far better create a more
# closely mirrored HttpRequest() object prior to passing it to
# _generate_cache_header_key().
key = key.replace(settings.LANGUAGE_CODE, settings.LANGUAGES[settings.DEFAULT_LANGUAGE][0])
return key
@receiver(post_save)
def clear_cache_for_this_item(sender, instance, **kwargs):
# If this is a sub-class of another model
if sender not in BaseModelofThisClass.__subclasses__():
return
else:
cache.delete(instance.cache_key)
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