Django 1.3 或更低版本的 Django Admin 中的自定义过滤器

问题描述

如何将自定义过滤器添加到 django admin(显示在模型仪表板右侧的过滤器)?我知道包含基于该模型的字段的过滤器很容易，但是像这样的计算"字段呢:

How can I add a custom filter to django admin (the filters that appear on the right side of a model dashboard)? I know its easy to include a filter based on a field of that model, but what about a "calculated" field like this:

class NewsItem(models.Model):
    headline = models.CharField(max_length=4096, blank=False)
    byline_1 = models.CharField(max_length=4096, blank=True)
    dateline = models.DateTimeField(help_text=_("date/time that appears on article"))
    body_copy = models.TextField(blank=False)

    when_to_publish = models.DateTimeField(verbose_name="When to publish",  blank=True, null=True)

    # HOW CAN I HAVE "is_live" as part of the admin filter?  It's a calculated state!!
    def is_live(self):
        if self.when_to_publish is not None:
            if ( self.when_to_publish < datetime.now() ):
                return """ <img alt="True" src="/media/img/admin/icon-yes.gif"/> """
        else:
            return """ <img alt="False" src="/media/img/admin/icon-no.gif"/> """      

    is_live.allow_tags = True

<小时>

class NewsItemAdmin(admin.ModelAdmin):
    form = NewsItemAdminForm
    list_display = ('headline', 'id', 'is_live')
    list_filter = ('is_live')  #  how can i make this work??

推荐答案

感谢 gpilotino 让我朝着正确的方向推进.

Thanks to gpilotino for giving me the push into the right direction for implementing this.

我注意到问题的代码使用日期时间来确定它的活动时间.所以我使用了 DateFieldFilterSpec 并对其进行了子类化.

I noticed the question's code is using a datetime to figure out when its live . So I used the DateFieldFilterSpec and subclassed it.

from django.db import models
from django.contrib.admin.filterspecs import FilterSpec, ChoicesFilterSpec,DateFieldFilterSpec
from django.utils.encoding import smart_unicode
from django.utils.translation import ugettext as _
from datetime import datetime

class IsLiveFilterSpec(DateFieldFilterSpec):
    """
    Adds filtering by future and previous values in the admin
    filter sidebar. Set the is_live_filter filter in the model field attribute
    'is_live_filter'.    my_model_field.is_live_filter = True
    """

    def __init__(self, f, request, params, model, model_admin):
        super(IsLiveFilterSpec, self).__init__(f, request, params, model,
                                               model_admin)
        today = datetime.now()
        self.links = (
            (_('Any'), {}),
            (_('Yes'), {'%s__lte' % self.field.name: str(today),
                       }),
            (_('No'), {'%s__gte' % self.field.name: str(today),
                    }),

        )


    def title(self):
        return "Is Live"

# registering the filter
FilterSpec.filter_specs.insert(0, (lambda f: getattr(f, 'is_live_filter', False),
                               IsLiveFilterSpec))

要使用你可以把上面的代码放到一个filters.py中，然后在你想要添加过滤器的模型中导入

To use you can put the above code into a filters.py, and import it in the model you want to add the filter to

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