Re: Django's cache framework problem

Django's cached framework and @cached_property are two different things, though both has "cached" it doesn't mean that they share memory....

https://docs.djangoproject.com/zh-hans/2.0/topics/cache/

https://docs.djangoproject.com/zh-hans/2.0/ref/utils/#module-django.utils.functional

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_attr

But 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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         工作愉快！

                     

林挺滨

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