打印仅与django中的外键相关的字段

Question

我试图只打印与我的模型的外键关联的条目。我有一系列列表，我想打印列表名称和该列表下的所有项目。我当前的问题是每个列表都有一个 div 生成，这很好，但是与每个列表关联的每个项目也在 div 内部打印出来，而不仅仅是与关联的项目列表名称。

观看次数

def control_panel(request, username):

    context = RequestContext(request)
    if username == request.user.username:
        if request.user.is_authenticated():
            user = User.objects.get(username=username)

            lists = request.user.newlist_set.all()

            listitems = request.user.newlistitem_set.all().filter(list_name = lists)

            return render_to_response('controlpanel.html', {'lists': lists,'listitems':listitems,}, context)
        else:
            return render_to_response('login.html', {}, context)
    else:
        return render_to_response('controlpanel.html', {}, context)

型号

from django.db import models
from django.contrib.auth.models import User

class newlist(models.Model):
    user = models.ForeignKey(User)
    list_name = models.CharField(max_length = 100)
    picture = models.ImageField(upload_to='profiles/', default = "")

    def __str__(self):
        return self.list_name

class newlistitem(models.Model):
    user = models.ForeignKey(User)
    list_name = models.ForeignKey(newlist)
    list_item = models.CharField(max_length = 200)


    def __str__(self):
        return self.list_item

HTML

            {% for lista in lists %} <!-- This is a call to the lists that exist for eaach model taht s instantiates -->

                    <div id = "indivlistitem">


                        <b>{{lista}}</b><br> <!-- This is the title of each list that is rendered to the HTML -->

                        {% for eachlistitem in listitems %}

                            {{eachlistitem}}

                        {%endfor%}

                    </div>

                {% endfor %}

Answer 1

据我了解，您的上下文中不需要列表项，拥有新列表就足够了。您也可以访问模板中的查询，因此您可以直接在模板中访问外键。像这样：

{% for eachlistitem in lista.newlistitem_set.all %}

。这将为您提供当前列表为 list_name

的所有列表项

Answer 2

问题出在你models.py中的listitems定义。具体来说，您将 lists 定义为与给定用户相关的所有列表，这很好，但随后将 listitems 定义为与该用户相关的每个列表 (filter(list_name=lists) 相关的每个列表项，这很糟糕。

因为请求上下文只是 python 字典，并且可以嵌套，所以我会做如下的事情：

def control_panel(request, username):

    context = RequestContext(request)
    if username == request.user.username:
        if request.user.is_authenticated():
            user = User.objects.get(username=username)

            lists = request.user.newlist_set.all()

            listitems = {}
            for list in lists:
                listitems[list.list_name] = request.user.newlistitem_set.filter(list_name=list)

            return render_to_response('controlpanel.html', {'lists': lists,'listitems':listitems,}, context)
        else:
            return render_to_response('login.html', {}, context)
    else:
        return render_to_response('controlpanel.html', {}, context)

这将创建一个字典，每个列表一个条目，然后您可以在模板中呈现：

        {% for lista in lists %} <!-- This is a call to the lists that exist for eaach model taht s instantiates -->

                <div id = "indivlistitem">


                    <b>{{lista}}</b><br> <!-- This is the title of each list that is rendered to the HTML -->

                    {% for eachlistitem in listitems.{{lista.list_name}} %}

                        {{eachlistitem}}

                    {%endfor%}

                </div>

            {% endfor %}

打印仅与django中的外键相关的字段

Printing fields only related to foreignkey in django

django

foreign-keys

观看次数

型号

HTML