Question

我需要在主django网站管理页面显示多少个对象。例如，在我需要显示的模型列表中

Elephants (6)

而不是

Elephants

我将此代码添加到我的模型中：

class Elephant(models.Model):
    ....
    class Meta:
        verbose_name_plural = 'Elephants ' + '(' + unicode(count_elephants()) + ')'

其中count_elephants（）计算对象数。问题是verbose_name_plural是在服务器启动时计算的，在删除/插入对象时不会调用，因此该计算值变得无关紧要。是否有可能以正确的方式做到这一点？谢谢！

Answer 1

由于verbose_name_plural以其他许多方式使用，更好的方法是更改管理索引视图和管理模板。

但是，由于管理员应用程序可以更改，这可能与特定版本的 Django的。我附加了例如从django 1.2.5获取的修改后的管理员。

（注意：我将使用索引方法的原位替换，但最好将其子类化而不是替换方法）

首先，从django / contrib / admin / sites.py复制AdminSite.index方法，并且需要导入，并将其修改为包含计数（更改了一行，查找“此行已添加”）。它适用于您的任何admin.py文件或适当的其他地方：

from django.utils.text import capfirst
from django import template
from django.shortcuts import render_to_response
from django.views.decorators.cache import never_cache
from django.utils.translation import ugettext as _

def index_with_count(self, request, extra_context=None):
    """
    Displays the main admin index page, which lists all of the installed
    apps that have been registered in this site.
    """
    app_dict = {}
    user = request.user
    for model, model_admin in self._registry.items():
        app_label = model._meta.app_label
        has_module_perms = user.has_module_perms(app_label)

        if has_module_perms:
            perms = model_admin.get_model_perms(request)

            # Check whether user has any perm for this module.
            # If so, add the module to the model_list.
            if True in perms.values():
                model_dict = {
                    'name': capfirst(model._meta.verbose_name_plural),
                    'admin_url': mark_safe('%s/%s/' % (app_label, model.__name__.lower())),
                    'perms': perms,
                    'count': model.objects.count(), # THIS LINE WAS ADDED
                }
                if app_label in app_dict:
                    app_dict[app_label]['models'].append(model_dict)
                else:
                    app_dict[app_label] = {
                        'name': app_label.title(),
                        'app_url': app_label + '/',
                        'has_module_perms': has_module_perms,
                        'models': [model_dict],
                    }

    # Sort the apps alphabetically.
    app_list = app_dict.values()
    app_list.sort(lambda x, y: cmp(x['name'], y['name']))

    # Sort the models alphabetically within each app.
    for app in app_list:
        app['models'].sort(lambda x, y: cmp(x['name'], y['name']))

    context = {
        'title': _('Site administration'),
        'app_list': app_list,
        'root_path': self.root_path,
    }
    context.update(extra_context or {})
    context_instance = template.RequestContext(request, current_app=self.name)
    return render_to_response(self.index_template or 'admin/index.html', context,
        context_instance=context_instance
    )

site.index = never_cache(type(site.index)(index_with_count, site, AdminSite))

现在将django / contrib / admin / templates / admin / index.html文件复制到任何模板文件夹中的admin / index.html中，以覆盖原始模板并对其进行修改以显示计数：

{% extends "admin/base_site.html" %} 
{% load i18n %} 

{% block extrastyle %}{{ block.super }}<link rel="stylesheet" type="text/css" href="{% load adminmedia %}{% admin_media_prefix %}css/dashboard.css" />{% endblock %} 

{% block coltype %}colMS{% endblock %} 

{% block bodyclass %}dashboard{% endblock %} 

{% block breadcrumbs %}{% endblock %} 

{% block content %}
<div id="content-main">

{% if app_list %}
    {% for app in app_list %}
        <div class="module">
        <table summary="{% blocktrans with app.name as name %}Models available in the {{ name }} application.{% endblocktrans %}">
        <caption><a href="{{ app.app_url }}" class="section">{% blocktrans with app.name as name %}{{ name }}{% endblocktrans %}</a></caption>
        {% for model in app.models %}
            <tr>
              <th scope="row">
                {% if model.perms.change %}
                    <a href="{{ model.admin_url }}">{{ model.name }}</a>
                {% else %}
                    {{ model.name }}
                {% endif %}
                ({{ model.count }})
              </th>

            {% if model.perms.add %}
                <td><a href="{{ model.admin_url }}add/" class="addlink">{% trans 'Add' %}</a></td>
            {% else %}
                <td>&nbsp;</td>
            {% endif %}

            {% if model.perms.change %}
                <td><a href="{{ model.admin_url }}" class="changelink">{% trans 'Change' %}</a></td>
            {% else %}
                <td>&nbsp;</td>
            {% endif %}
            </tr>
        {% endfor %}
        </table>
        </div>
    {% endfor %}
{% else %}
    <p>{% trans "You don't have permission to edit anything." %}</p>
{% endif %}
</div>
{% endblock %}

{% block sidebar %}
<div id="content-related">
    <div class="module" id="recent-actions-module">
        <h2>{% trans 'Recent Actions' %}</h2>
        <h3>{% trans 'My Actions' %}</h3>
            {% load log %}
            {% get_admin_log 10 as admin_log for_user user %}
            {% if not admin_log %}
            <p>{% trans 'None available' %}</p>
            {% else %}
            <ul class="actionlist">
            {% for entry in admin_log %}
            <li class="{% if entry.is_addition %}addlink{% endif %}{% if entry.is_change %}changelink{% endif %}{% if entry.is_deletion %}deletelink{% endif %}">
                {% if entry.is_deletion %}
                    {{ entry.object_repr }}
                {% else %}
                    <a href="{{ entry.get_admin_url }}">{{ entry.object_repr }}</a>
                {% endif %}
                <br/>
                {% if entry.content_type %}
                    <span class="mini quiet">{% filter capfirst %}{% trans entry.content_type.name %}{% endfilter %}</span>
                {% else %}
                    <span class="mini quiet">{% trans 'Unknown content' %}</span>
                {% endif %}
            </li>
            {% endfor %}
            </ul>
            {% endif %}
    </div>
</div>
{% endblock %}

这样做。（您仍然需要修改app_index视图以在应用索引页面中正确查看计数，我将此作为练习留给您： - ）

显示Django管理员索引中每个模型的实例数

1 个答案: