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我有一个方法叫postState(). 此方法应该检查帖子的状态。帖子可以有 3 种状态（新、旧、存档），该方法将帖子作为其参数。该方法根据过去的天数计算状态。

  • 30 天前的帖子是新的
  • 30 - 60 天前的帖子已过时
  • 一个 > 60 天的旧帖子已存档

这是代码：

#This method automatically determines the state of the post. Whether it is (New, Old, or          #   Archived)
#The method takes in one parameter which is the post itself
#the method compares the date of which the post was published in and the current date
#It then uses an algorithim to determine the difference in number of days between the current date and the published date
#Based on the amount returned, if the amount is less than 30 days, the state = "NEW", if between 30 and 60, the state = "OLD", if greater than 60, the state = "ARCHIVED"

def postState(self):
    current_time = datetime.datetime.now()
    p = Post.objects.get(id = self.id)

    #used if the current year is greater than the year of the published post
    if current_time.year > self.pub_Date.year:
        #this is in case for exmaple the published month of the post is December and the current month is January
        #Although the years are diff yet the diff in days may not be greater than 30
        #Ex: published date: 2012, 12, 28 ----- current date: 2013, 1, 10
        if current_time.month == 1 and self.pub_Date.month ==12 and (current_time.day + (31 - self.pub_Date.day)) > 30:
            p.state = 'Old'
            p.save()
        #this is in case for exmaple the published month of the post is November and the current month is January
        #Although the years are diff yet the diff in days may not be greater than 30 and less than 60
        #Ex: published date: 2012, 11, 1 ----- current date: 2013, 1, 28
        elif current_time.month == 1 and self.pub_Date.month ==11 and (current_time.day + (31 - self.pub_Date.day)) < 60:
            p.state = 'Old'
            p.save()
        else:
            p.state = 'Archived'
            p.save()
    #Used when the current year and Published year of the post are the same
    if current_time.year == self.pub_Date.year:

        day_diff_diff_month = current_time.day + (31 - self.pub_Date.day)
        day_diff_same_month = current_time.day - self.pub_Date.day
        month_diff = current_time.month - self.pub_Date.month
        if month_diff >= 1:
            month_diff = month_diff - 1
            total_diff = (month_diff*31) + day_diff_diff_month
        else:
            total_diff = day_diff_same_month

        if total_diff > 30 and total_diff < 60:
            p.state = 'Old'
            p.save()
        if total_diff > 60:
            p.state = 'Archived'
            p.save()

我希望在用户打开帖子页面（post.html）或启动网站时运行此方法。

提前致谢。

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1 回答 1

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  1. 您确定帖子状态的代码似乎非常复杂。我是这样写的：

    @property
def state(self):
    """The state of the post:
    'new' if the post is younger than 30 days;
    'old' if the post is between 30 and 60 days old;
    'archived' if the post is 60 days old or older.

    """
    age = (datetime.datetime.now() - self.pub_Date).days
    if age < 30: return 'new'
    elif age < 60: return 'old'
    else: return 'archived'

  2. 如果我正确理解您的问题，您计划在每次有人查看帖子时更新帖子的状态。这将导致大量的数据库更改。但是既然可以从 计算帖子的状态pub_Date，为什么还要麻烦呢？为什么不只在需要时计算状态，如上所示？

    您可以轻松地根据计算的日期发出查询。例如，这是一个只选择“新”帖子的查询：

    from datetime import datetime, timedelta
Post.objects.filter(pub_Date__gt = datetime.now() - timedelta(days=30))

    这是一个只选择“旧”帖子的帖子：

    now = datetime.now()
Post.objects.filter(pub_Date__range = (now - timedelta(days=60),
                                       now - timedelta(days=30))

    您可能还需要弄清楚如何计算数据库引擎中的状态。确切的细节取决于您的数据库，但例如，在 MySQL 中，您可以使用DATEDIFF函数.

于 2013-04-12T20:01:49.823 回答