在Django Admin中为list_filter创建自定义过滤器

时间:2012-08-24 03:10:41

标签: django django-admin

我想为django admin而不是普通的'is_staff'和'is_superuser'制作自定义过滤器。我在Django文档中读过这个list_filter。 自定义过滤器以这种方式工作:

from datetime import date

from django.utils.translation import ugettext_lazy as _
from django.contrib.admin import SimpleListFilter

class DecadeBornListFilter(SimpleListFilter):
    # Human-readable title which will be displayed in the
    # right admin sidebar just above the filter options.
    title = _('decade born')

    # Parameter for the filter that will be used in the URL query.
    parameter_name = 'decade'

    def lookups(self, request, model_admin):
        """
        Returns a list of tuples. The first element in each
        tuple is the coded value for the option that will
        appear in the URL query. The second element is the
        human-readable name for the option that will appear
        in the right sidebar.
        """
        return (
            ('80s', _('in the eighties')),
            ('90s', _('in the nineties')),
        )

    def queryset(self, request, queryset):
        """
        Returns the filtered queryset based on the value
        provided in the query string and retrievable via
        `self.value()`.
        """
        # Compare the requested value (either '80s' or '90s')
        # to decide how to filter the queryset.
        if self.value() == '80s':
            return queryset.filter(birthday__gte=date(1980, 1, 1),
                                    birthday__lte=date(1989, 12, 31))
        if self.value() == '90s':
            return queryset.filter(birthday__gte=date(1990, 1, 1),
                                    birthday__lte=date(1999, 12, 31))

class PersonAdmin(ModelAdmin):
    list_filter = (DecadeBornListFilter,)

但我已经为list_display制作了这样的自定义函数:

def Student_Country(self, obj):
    return '%s' % obj.country
Student_Country.short_description = 'Student-Country'

我是否有可能在list_filter中使用list_display的自定义函数,而不是为list_filter编写新的自定义函数?欢迎任何建议或改进..需要一些指导......谢谢......

3 个答案:

答案 0 :(得分:22)

您确实可以通过扩展SimpleListFilter为管理过滤器添加自定义过滤器。例如,如果您想为非洲'添加一个大陆过滤器?对于上面使用的国家/地区管理过滤器,您可以执行以下操作:

在admin.py中:

from django.contrib.admin import SimpleListFilter

class CountryFilter(SimpleListFilter):
    title = 'country' # or use _('country') for translated title
    parameter_name = 'country'

    def lookups(self, request, model_admin):
        countries = set([c.country for c in model_admin.model.objects.all()])
        return [(c.id, c.name) for c in countries] + [
          ('AFRICA', 'AFRICA - ALL')]

    def queryset(self, request, queryset):
        if self.value() == 'AFRICA':
            return queryset.filter(country__continent='Africa')
        if self.value():
            return queryset.filter(country__id__exact=self.value())

class CityAdmin(ModelAdmin):
    list_filter = (CountryFilter,)

答案 1 :(得分:5)

您的list_display方法会返回一个字符串,但如果我理解正确,您要做的是添加一个允许选择学生国家的过滤器,对吗?

对于这个简单的关系过滤器,实际上对于“Student-Country”列表显示列,您不需要创建自定义过滤器类,也不需要自定义列表显示方法;这就足够了:

class MyAdmin(admin.ModelAdmin):
    list_display = ('country', )
    list_filter = ('country', )

django执行list_filter的方式,如in the docs所述,首先自动匹配您提供的字段到预先构建的过滤器类;这些过滤器包括CharField和ForeignKey。

list_display同样使用通过检索相关对象传递的字段并返回其中的 unicode 值来自动化changelist列的填充(与上面提供的方法相同)。

答案 2 :(得分:0)

除了Rick Westera答案之外,这是这种情况下的Django Docs

  

ModelAdmin.list_filter
  设置list_filter以激活管理员更改列表页面右侧栏中的过滤器
  list_filter应该是元素的列表或元组