This is my fault. When I execute "cache.set(key, model_instance)", the model instance hasn't get the cache content.
林挺滨 <lintingbin31@gmail.com> 于2018年6月28日周四 下午1:33写道：
I use cache api to keep model instances, but "@cache_property" isn't work. Now I use the module global var to keep model instances.赖信桃 <laixintaoo@gmail.com> 于2018年6月28日周四 下午1:29写道：One is cached framework , one is just a better "property". Use cache api if you want to keep some instances.--On Thu, Jun 28, 2018 at 13:11 林挺滨 <lintingbin31@gmail.com> wrote:The cached result will persist as long as the instance does, so if the instance is passed around and the function subsequently invoked, the cached result will be returned.
https://docs.djangoproject.com/zh-hans/2.0/topics/cache/ Say:
You can cache any Python object that can be pickled safely: strings, dictionaries, lists of model objects, and so forth.Then I use cache API to cache the model instance, "cached result" of the instance should be cached together.
- What is the problem?
赖信桃 <laixintaoo@gmail.com> 于2018年6月28日周四 上午11:44写道：Django's cached framework and @cached_property are two different things, though both has "cached" it doesn't mean that they share memory....Read the docs.--林挺滨 <lintingbin31@gmail.com>于2018年6月28日周四 上午10:31写道：class Log(models.Model):
type = models.CharField(max_length=200, unique=True)
column = SortedManyToManyField(Column, blank=True)
min_column_cnt = models.IntegerField(blank=True, default=0, help_text='0 equal NULL')
@cached_property
def column_list_name(self):
return [col.name for col in self.column.all()]
@cached_property
def column_len(self):
return len(self.column.all())
@cached_property
def get_all_column_checker(self):
column_ids = [c.id for c in self.column.all()]
return ColumnChecker.objects.select_related('column').filter(column_id__in=column_ids)def get_log_attr(log_type):
global log_attr_dict, log_attr_last_update_ts
if (datetime.now() - log_attr_last_update_ts).total_seconds() < update_log_attr_interval and \
log_type in log_attr_dict:
return log_attr_dict[log_type]
log_attr_dict[log_type] = Log.objects.prefetch_related('column').get(type=log_type)
log_attr_last_update_ts = datetime.now()
return log_attr_dict[log_type]Now I use module global var "log_attr_dict" to cache the Log instance, @cached_property of the instance is work.def get_log_attr(log_type):
log_attr = cache.get(log_type)
if not log_attr:
log_attr = Log.objects.prefetch_related('column').get(type=log_type)
cache.set(log_type, log_attr, update_log_attr_interval)
return log_attrBut if I use cache api to cache the Log instance, @cache_property of the instance isn't work. (I use the local memory cache.)赖信桃 <laixintaoo@gmail.com> 于2018年6月27日周三 下午9:07写道：Show me your code snippet.--林挺滨 <lintingbin31@gmail.com>于2018年6月27日周三 下午8:44写道：When I use cache framework api to cache a model instance, @cached_property of the instance doesn't work. Why?--
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--祝您 身体健康工作愉快！林挺滨
祝您 身体健康
工作愉快！
林挺滨
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