相关疑难解决方法(0)

如何在django中获取用户的IP？

我有这样的观点:

# Create your views
from django.contrib.gis.utils import GeoIP
from django.template import  RequestContext
from django.shortcuts import render_to_response


def home(request):
  g = GeoIP()
  client_ip = request.META['REMOTE_ADDR']
  lat,long = g.lat_lon(client_ip)
  return render_to_response('home_page_tmp.html',locals())

但我得到这个错误:

KeyError at /mypage/
    'REMOTE_ADDR'
    Request Method: GET
    Request URL:    http://mywebsite.com/mypage/
    Django Version: 1.2.4
    Exception Type: KeyError
    Exception Value:    
    'REMOTE_ADDR'
    Exception Location: /mysite/homepage/views.py in home, line 9
    Python Executable:  /usr/bin/python
    Python Version: 2.6.6
    Python Path:    ['/mysite', '/usr/local/lib/python2.6/dist-packages/flup-1.0.2-py2.6.egg', '/usr/lib/python2.6', '/usr/lib/python2.6/plat-linux2', '/usr/lib/python2.6/lib-tk', '/usr/lib/python2.6/lib-old', '/usr/lib/python2.6/lib-dynload', '/usr/local/lib/python2.6/dist-packages', '/usr/lib/python2.6/dist-packages', '/usr/lib/pymodules/python2.6']
    Server time:    Sun, 2 …

我试图在Django中以原子方式递增一个简单的计数器.我的代码看起来像这样:

from models import Counter
from django.db import transaction

@transaction.commit_on_success
def increment_counter(name):
    counter = Counter.objects.get_or_create(name = name)[0]
    counter.count += 1
    counter.save()

如果我正确理解Django,这应该将函数包装在事务中并使增量原子化.但它不起作用,并且在计数器更新中存在竞争条件.如何使这些代码成为线程安全的？

什么是@property在Django？

这是我的理解：@property是一个类中方法的装饰器，用于获取方法中的值。

但是，据我所知，我可以像平常一样调用该方法，它就会得到它。所以我不确定它到底是做什么的。

文档中的示例：

from django.db import models

class Person(models.Model):
    first_name = models.CharField(max_length=50)
    last_name = models.CharField(max_length=50)
    birth_date = models.DateField()

    def baby_boomer_status(self):
        "Returns the person's baby-boomer status."
        import datetime
        if self.birth_date < datetime.date(1945, 8, 1):
            return "Pre-boomer"
        elif self.birth_date < datetime.date(1965, 1, 1):
            return "Baby boomer"
        else:
            return "Post-boomer"

    @property
    def full_name(self):
        "Returns the person's full name."
        return '%s %s' % (self.first_name, self.last_name)

如果存在与不存在有什么区别？

有一个让我感到烦恼的问题，我想做的就是当我请求detail.html时，Post模型的视图将在访问计数中加1，该怎么做？谢谢。

博客/models.py

class Post(models.Model):
   views = models.PositiveIntegerField(default=0)

博客/views.py

def detail(request):
    return render(request, 'blog/detail.html')