python-将当前过滤器选择输入到Django中的另一个自定义SimpleListFilter

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我正在尝试更改一个过滤器的提示,以响应在另一个过滤器中进行的当前选择.对于如何获取传递给AttributeFilter的AttributeCategoryFilter的当前选定值,我感到很迷惑.我正在使用Django 1.4-dev.试图弄清楚我是否应该为此目的使用RelatedFieldListFilter.这些功能似乎还太年轻,以至于还没有任何示例在野外徘徊.

    class AttributeCategoryFilter(SimpleListFilter):
        title = _('Attribute Category')
        parameter_name = 'attribute_category'
        def lookups(self, request, model_admin):
            attributes = Attribute.objects.filter(parent_attribute=None)
            prompts = []
            for attribute in attributes:
                prompts.append((attribute.title, _(str(attribute.title))))
            return prompts
        def queryset(self, request, queryset):
            if self.value():
                return queryset.filter(attribute__category=self.value())
            else:
                return queryset


    class AttributeFilter(SimpleListFilter):
        title = _('Attribute Title')
        parameter_name = 'attribute_title'
        def lookups(self, request, model_admin):
            desired_category =  # Needs to be a reference to the selected value in the AttributeCategoryFilter above
            attributes = Attribute.objects.filter(category=desired_category).exclude(parent_attribute=None)
            prompts = []
            for attribute in attributes:
                prompts.append((attribute.title, _(str(attribute.title))))
            return prompts
        def queryset(self, request, queryset):
            if self.value():
                return queryset.filter(attribute__title=self.value())
            else:
                return queryset


    class ValueAdmin(admin.ModelAdmin):
        list_display = ('package', 'attribute', 'presence', 'text', 'modified', 'created')
        list_filter = ('package', AttributeCategoryFilter, AttributeFilter, 'presence', 
            'attribute__admin_approved', 'attribute__dtype', 'modified')
        search_fields = ('package', 'attribute', 'text')
        list_display_links = ('package', )
        list_editable = ('presence', 'text')
        list_per_page = 20000
    admin.site.register(Value, ValueAdmin)   

解决方法:

这是为我工作的…只有在使用“类别”过滤器后,“ TypeListFilter”才可见,然后显示所选类别的“ subTypeOf”所有条目.更进一步的“特殊情况”破解可确保当用户选择另一个类别时过滤器消失.
“ _class”参数增加了一些额外的灵活性.我将相同的过滤器用于不同但相关的Type类,并且只需要覆盖此参数即可.只需将其替换为要过滤的admin.Model类即可.

class TypeListFilter( admin.SimpleListFilter):
    """
    Provide filter for DnaComponentType (the actual "second level" type).

    This filter has one cosmetic problem, which is that it's setting is not
    automatically deleted if the category filter is changed. I tried but the
    request and queryset are all immutable. Instead, the queryset method is 
    checking for any missmatch between category and filter name and filtering
    is ignored if the category name doesn't match the current subType name.
    """
    title = 'Type'
    parameter_name = 'type'

    _class = None

    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.
        """
        if not u'category' in request.GET:
            return ()

        category_name = request.GET[u'category']
        types = self._class.objects.filter(subTypeOf__name=category_name)
        return ( (t.name, t.name) for t in types )

    def queryset(self, request, queryset):
        """
        Returns the filtered queryset based on the value
        provided in the query string and retrievable via
        `self.value()`.
        """
        if not u'category' in request.GET:
            return queryset

        category = request.GET[u'category']
        subtypes = self._class.objects.filter(subTypeOf__name=category)

        r = queryset.filter(componentType__subTypeOf__name=category)

        if not self.value():
            return r

        ## special case: missmatch between subtype and category
        ## which happens after switching the category
        if len(subtypes.filter(name=self.value())) == 0:
            return r

        return r.filter(componentType__name=self.value())

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