管理面板

Question

默认情况下，django admin的list_filter提供模型选择中可用的所有过滤器。但除了那些我想要一个过滤器之外，我们可以说它是'无'过滤器。

class Mymodel:
    char choice field (choices=(('1', 'txt1', '2', 'txt2')), null=True)

class MymodelAdmin(admin.ModelAdmin):
    ...
    list_filter = [..., choice_field, ...]
    ...

这将在管理面板（右侧过滤器）All, 'txt1', 'txt2'中设置三个过滤器。对？ 如果没有从选项中分配值，我还想要一个过滤器'None'。

到目前为止我尝试了什么..

class ChoiceFieldFilter(admin.filters.ChoicesFieldListFilter):

    def __init__(self, *args, **kwargs):
        super(ChoiceFieldFilter, self).__init__(*args, **kwargs)

        self.lookup_val = [('', 'None')]

    def queryset(self, request, queryset):
        print self.lookup_val
        print  self.field.flatchoices
        if self.lookup_val == '':
            return queryset.filter(choice_field='')
        else:
            return queryset.filter(choice_field=self.lookup_val)

    def choices(self, cl):
        pass

然后在管理类

中

list_filter = [..., ('choice_field', ChoiceFieldFilter), ...]

但它不起作用，我无法在django admin中看到None过滤器

Answer 1

默认情况下，admin.AllValuesFieldListFilter返回一个选项的值，而不是选择的详细名称。因此，为了解决它，使用修改后的admin.AllValuesFieldListFilter。

class AllValuesChoicesFieldListFilter(admin.AllValuesFieldListFilter):

    def choices(self, changelist):
        yield {
            'selected': self.lookup_val is None and self.lookup_val_isnull is None,
            'query_string': changelist.get_query_string({}, [self.lookup_kwarg, self.lookup_kwarg_isnull]),
            'display': _('All'),
        }
        include_none = False

        # all choices for this field
        choices = dict(self.field.choices)

        for val in self.lookup_choices:
            if val is None:
                include_none = True
                continue
            val = smart_text(val)
            yield {
                'selected': self.lookup_val == val,
                'query_string': changelist.get_query_string({
                    self.lookup_kwarg: val,
                }, [self.lookup_kwarg_isnull]),

                # instead code, display title
                'display': choices[val],
            }
        if include_none:
            yield {
                'selected': bool(self.lookup_val_isnull),
                'query_string': changelist.get_query_string({
                    self.lookup_kwarg_isnull: 'True',
                }, [self.lookup_kwarg]),
                'display': self.empty_value_display,
            }

<强>用法：

list_filter = (
        ('country_origin', AllValuesChoicesFieldListFilter),
    )

Answer 2

您不必制作自定义列表过滤器。只需使用django的AllValuesFieldListFilter

from django.contrib.admin.filters import AllValuesFieldListFilter
...
list_filter = [..., ('choice_field', AllValuesFieldListFilter)]
...