问题描述
我试图模仿的例子： https://books.agiliq.com/projects/django-admin-cookbook/en/latest/filtering_calculated_fields.html
/ Admin / gallery / galleryitem /中的FieldError 无法将关键字“ on_sale”解析为字段。
选择包括：content_type，content_type_id，深度，描述，direct_sale，direct_sale_extra_description，direct_sale_price，draft_title，expire_at，expired，external_links，first_published_at，formsubmission，gallery_images，go_live_at，group_permissions，last_at，ed_ed，ed_at，ed_ed，ed_at，ed_at，ed_ed，ed_reed， live_revision，live_revision_id，locked，locked_at，locked_by，locked_by_id，numchild，所有者，owner_id，page_ptr，page_ptr_id，路径，重定向，修订，search_description，SEO_title，show_in_menus，sites_rooted_here，slug，stock，title，surl_path，page_re状态/ p>
models.py
class galleryItem(Page):
parent_page_types = ['InstallationPage']
description = models.CharField(blank=True,max_length=250)
direct_sale = models.BooleanField("On Sale",default=False,help_text="Check this Box to list this item for sale directly on your website.")
direct_sale_price = models.DecimalField("Sale price,$",blank=True,null=True,max_digits=6,decimal_places=2,help_text="Add more info about this item for the store page only.")
direct_sale_extra_description = models.CharField("Addtional sale description (optional)",max_length=250,)
stock = models.IntegerField("Number in stock",)
def external_sale(self):
return bool(self.external_links.count())
def on_sale(self,obj):
return obj.external_sale or obj.direct_sale
class ExternalLink(Orderable):
gallery_item = ParentalKey(galleryItem,on_delete=models.CASCADE,related_name='external_links',help_text="Add details about the listing,ex. dimensions,framing.")
description = models.CharField(blank=True,max_length=250)
external_sale_url = models.URLField(blank=True,help_text="Add an external link to sell this.")
wagtail_hooks.py
class OnSaleFilter(SimpleListFilter):
title = 'On Sale'
parameter_name = 'on_sale'
def lookups(self,request,model_admin):
return (
('Yes','Yes'),('No','No'),)
def queryset(self,queryset):
value = self.value()
if value == 'Yes':
return queryset.filter(on_sale=True)
elif value == 'No':
return queryset.filter(on_sale=False)
return queryset
class galleryItemAdmin(ThumbnailMixin,ModelAdmin):
model = galleryItem
menu_label = 'All gallery Items' # ditch this to use verbose_name_plural from model
menu_icon = 'pick' # change as required
menu_order = 200 # will put in 3rd place (000 being 1st,100 2nd)
add_to_settings_menu = False # or True to add your model to the Settings sub-menu
exclude_from_explorer = False # or True to exclude pages of this type from Wagtail's explorer view
list_display = ('title','admin_thumb','description','direct_sale','external_sale')
list_filter = (OnSaleFilter,InstallationFilter,)
list_per_page = 50
search_fields = ('title','description')
thumb_image_field_name = 'main_image'
thumb_image_width = 100
解决方法
只需将计算添加到查询集。 示例是新闻>状态：
#_____________________________________________________________________________
class NewsItem(models.Model):
objects = NewsItemQuerySet.as_manager()
#_____________________________________________________________________________
class NewsItemQuerySet(models.query.QuerySet):
def with_status_key(self):
now = timezone.now()
queryset = self.select_related('parent')
queryset = queryset.annotate(
status_key = Case(
When(go_live_at__gt=now,then=Value(0)),# pending
When(go_live_at__lte=now,expire_at__gte=now,then=Value(1)),# running
default=Value(2),# archived
output_field=IntegerField(),)
).order_by('status_key','go_live_at','expire_at')
return queryset
或者也许：
from wagtail.core.models import PageManager
#_____________________________________________________________________________
class MyManager(PageManager):
def get_queryset(self):
return super().get_queryset()
def with_status_key(self):
queryset = self. get_queryset().select_related('parent')
etc