开发环境
- django 1.11
DetailView 的相关源码
# ..Libsite-packagesdjangoviewsgenericdates.py
代码语言：javascript复制class DateDetailView(SingleObjectTemplateResponseMixin, BaseDateDetailView):
"""
Detail view of a single object on a single date; this differs from the
standard DetailView by accepting a year/month/day in the URL.
"""
template_name_suffix = '_detail'class BaseDateDetailView(YearMixin, MonthMixin, DayMixin, DateMixin, BaseDetailView):
"""
Detail view of a single object on a single date; this differs from the
standard DetailView by accepting a year/month/day in the URL.
"""
def get_object(self, queryset=None):
"""
Get the object this request displays.
"""
year = self.get_year()
month = self.get_month()
day = self.get_day()
date = _date_from_string(year, self.get_year_format(),
month, self.get_month_format(),
day, self.get_day_format())
# Use a custom queryset if provided
qs = self.get_queryset() if queryset is None else queryset
if not self.get_allow_future() and date > datetime.date.today():
raise Http404(_(
"Future %(verbose_name_plural)s not available because "
"%(class_name)s.allow_future is False."
) % {
'verbose_name_plural': qs.model._meta.verbose_name_plural,
'class_name': self.__class__.__name__,
})
# Filter down a queryset from self.queryset using the date from the
# URL. This'll get passed as the queryset to DetailView.get_object,
# which'll handle the 404
lookup_kwargs = self._make_single_date_lookup(date)
qs = qs.filter(**lookup_kwargs)
return super(BaseDetailView, self).get_object(queryset=qs)# ..Libsite-packagesdjangoviewsgenericdetail.py
代码语言：javascript复制class SingleObjectMixin(ContextMixin):
"""
Provides the ability to retrieve a single object for further manipulation.
"""
model = None
queryset = None
slug_field = 'slug'
context_object_name = None
slug_url_kwarg = 'slug'
pk_url_kwarg = 'pk'
query_pk_and_slug = False
def get_object(self, queryset=None):
"""
Returns the object the view is displaying.
By default this requires `self.queryset` and a `pk` or `slug` argument
in the URLconf, but subclasses can override this to return any object.
"""
# Use a custom queryset if provided; this is required for subclasses
# like DateDetailView
if queryset is None:
queryset = self.get_queryset()
# Next, try looking up by primary key.
pk = self.kwargs.get(self.pk_url_kwarg)
slug = self.kwargs.get(self.slug_url_kwarg)
if pk is not None:
queryset = queryset.filter(pk=pk)
# Next, try looking up by slug.
if slug is not None and (pk is None or self.query_pk_and_slug):
slug_field = self.get_slug_field()
queryset = queryset.filter(**{slug_field: slug})
# If none of those are defined, it's an error.
if pk is None and slug is None:
raise AttributeError("Generic detail view %s must be called with "
"either an object pk or a slug."
% self.__class__.__name__)
try:
# Get the single item from the filtered queryset
obj = queryset.get()
except queryset.model.DoesNotExist:
raise Http404(_("No %(verbose_name)s found matching the query") %
{'verbose_name': queryset.model._meta.verbose_name})
return obj看了源码发现 get_object，就是返回 单一的对象，相当于 return YouModel.objects.get(pk='pk')
重写 generic.DetailView 里面的 get_object
代码语言：javascript复制class DetailView(generic.DetailView):
model = Article # 模型名称
template_name = 'lw-article.html' # 模板名称
context_object_name = "article" # 传递给模板的变量名称
def get_object(self, queryset=None):
"""
Get the object this request displays. 获取对应文章的信息
"""
# 文章详情增加缓存
pk = self.kwargs.get(self.pk_url_kwarg) # 获取主键
obj = cache.get("article_obj_%s" % pk) # 获取该主键的缓存
if not obj: # 如果没有就
obj = super(DetailView, self).get_object() # get_object() 重新获取单个对象
cache.set("article_obj_%s" % pk, obj, CACHE_TIMEOUT_2D) # 设置该主键的缓存
return obj
