在此示例中，我尝试使用 mixin 在“PropertyListing”的 ListView 上呈现标签之前，我已经成功实现了 django-taggit:
控制台不断告诉我:
NameError: name 'Tag' is not defined
**问题显然来自 views.py 第 4 行。
我无法从像“PropertyListing”这样的模型中导入“Tag”，因为它是第三方库。
我试过导入
from taggit.managers import TaggableManager
在 views.py 但同样的错误。
我正在使用 django 2.1 和 django-taggit 1.1.0
下面是代码:
模型.py
from taggit.managers import TaggableManager
class City(models.Model):
name = models.CharField(max_length=200)
slug = models.SlugField(max_length=250, unique=True)
tags = TaggableManager()
class Meta:
verbose_name_plural = 'Cities'
def __str__(self):
return self.name
class PropertyListing(models.Model):
name = models.CharField(max_length=200)
slug = models.SlugField(max_length=250, unique=True)
price = models.DecimalField(max_digits=10, decimal_places=2)
description = models.TextField(max_length=1000)
address = models.CharField(max_length=1000)
is_active = models.BooleanField(default=False)
city = models.ForeignKey(City, on_delete=models.CASCADE, related_name='property_listings')
class Meta:
verbose_name_plural = 'Properties Listings'
def __str__(self):
return self.name
def save(self, *args, **kwargs):
self.slug = slugify(self.name)
super(PropertyListing, self).save(*args, **kwargs)
def get_absolute_url(self):
return reverse('core:property_detail', kwargs={'pk': self.pk})
View .py
class TagMixin(object):
def get_context_data(self, **kwargs):
context = super(TagMixin, self).get_context_data(**kwargs)
context['tags'] = Tag.objects.all()
return context
class PropertyListingView(TagMixin, ListView):
model = City
model_type = PropertyImage
queryset = PropertyListing.objects.all()
context_object_name = 'properties'
template_name = 'core/property-listing.html'
def get_context_data(self, *args, **kwargs):
context = super(PropertyListingView, self).get_context_data(**kwargs)
context['cities'] = City.objects.all()
context['properties'] = PropertyImage.objects.select_related('image_property_listing')
return context
class CityTaggedView(TagMixin, ListView):
model = City
context_object_name = 'cities'
template_name = 'core/city-tagged.html'
def get_queryset(self):
return City.objects.filter(tags__slug=self.kwargs.get('slug'))
网址.py
path('', PropertyListingView.as_view(), name='property_listing'),
path('tag/<slug:slug>/', CityTaggedView.as_view(), name='city_tagged')
任何帮助将不胜感激。我不明白为什么会这样。
请您参考如下方法:
您只需导入标签模型，例如:
# app/views.py
# import the <b>Tag</b> class
from taggit.models import <b>Tag</b>
class TagMixin(object):
def get_context_data(self, **kwargs):
context = super(TagMixin, self).get_context_data(**kwargs)
context['tags'] = <b>Tag</b>.objects.all()
return context
# ...毕竟，您的代码使用了 Tag，但您从未在 views.py 文件中定义它。这与 Django 或 taggit 本身没有太大关系，只是 Python 不理解你对 Tag 的意思。
