Can'；t在数据库中通过查询访问Django配置文件，同时获取登录用户的配置文件

我正在Django开发一个站点，有两种类型的配置文件。其中一个叫佩森。因此，我尝试使用以下代码访问Person对象：

from django.contrib.auth.forms import UserCreationForm
from django.template import RequestContext
from django.shortcuts import render_to_response,get_object_or_404
from django.core import urlresolvers
from django.http import HttpResponseRedirect
from django.contrib.auth.decorators import login_required
from accounts.forms import UserRegistrationForm, UserProfileForm
from pprint import pprint
from django.http import HttpResponse
from  models import User
from models import UserProfile

def profile(request, url,template_name='person/profile.html'):
    user=User(username=url).get_profile().person;
    return HttpResponse(user)

from django.contrib.auth.forms import UserCreationForm
from django.template import RequestContext
from django.shortcuts import render_to_response,get_object_or_404
from django.core import urlresolvers
from django.http import HttpResponseRedirect
from django.contrib.auth.decorators import login_required
from accounts.forms import UserRegistrationForm, UserProfileForm
from pprint import pprint
from django.http import HttpResponse
from accounts.forms import UserProfile

@login_required
def dashboard(request,template_name="account/dashboard.html"):
    return HttpResponse(request.user.get_profile().person)

它给出了一个错误：

DoesNotExist at /p/Haafiz/
UserProfile matching query does not exist.

在另一个地方，我尝试使用以下代码来实现：

from django.contrib.auth.forms import UserCreationForm
from django.template import RequestContext
from django.shortcuts import render_to_response,get_object_or_404
from django.core import urlresolvers
from django.http import HttpResponseRedirect
from django.contrib.auth.decorators import login_required
from accounts.forms import UserRegistrationForm, UserProfileForm
from pprint import pprint
from django.http import HttpResponse
from  models import User
from models import UserProfile

def profile(request, url,template_name='person/profile.html'):
    user=User(username=url).get_profile().person;
    return HttpResponse(user)

from django.contrib.auth.forms import UserCreationForm
from django.template import RequestContext
from django.shortcuts import render_to_response,get_object_or_404
from django.core import urlresolvers
from django.http import HttpResponseRedirect
from django.contrib.auth.decorators import login_required
from accounts.forms import UserRegistrationForm, UserProfileForm
from pprint import pprint
from django.http import HttpResponse
from accounts.forms import UserProfile

@login_required
def dashboard(request,template_name="account/dashboard.html"):
    return HttpResponse(request.user.get_profile().person)

在这种情况下，它运行良好。在我试图从db获取的对象访问概要文件的第一个地方，会出现什么问题？这两种情况在我看来都是一样的，但在上面的一种情况中存在问题。

User（name=url）

只生成一个User实例，而不是为某个用户查询数据库

改变

user=User(username=url).get_profile().person

到

---

请分享你的模型。。。现在是gesswork如何查询

Person

模型对象。