Класс SingleObjectMixin (Django 3.0)

from django.views.generic.detail import SingleObjectMixin

Provide the ability to retrieve a single object for further manipulation.

Диаграмма | Документация | Исходный код

Предки (MRO)

  1. SingleObjectMixin
  2. ContextMixin

Потомки

Атрибуты

  Определено в
context_object_name = None SingleObjectMixin
extra_context = None ContextMixin
model = None SingleObjectMixin
pk_url_kwarg = 'pk' SingleObjectMixin
query_pk_and_slug = False SingleObjectMixin
queryset = None SingleObjectMixin
slug_field = 'slug' SingleObjectMixin
slug_url_kwarg = 'slug' SingleObjectMixin

Методы

SingleObjectMixin

Insert the single object into the context dict.

def get_context_data(self, **kwargs):
    """Insert the single object into the context dict."""
    context = {}
    if self.object:
        context['object'] = self.object
        context_object_name = self.get_context_object_name(self.object)
        if context_object_name:
            context[context_object_name] = self.object
    context.update(kwargs)
    return super().get_context_data(**context)
ContextMixin
def get_context_data(self, **kwargs):
    kwargs.setdefault('view', self)
    if self.extra_context is not None:
        kwargs.update(self.extra_context)
    return kwargs

Get the name to use for the object.

def get_context_object_name(self, obj):
    """Get the name to use for the object."""
    if self.context_object_name:
        return self.context_object_name
    elif isinstance(obj, models.Model):
        return obj._meta.model_name
    else:
        return None

Return the object the view is displaying. Require `self.queryset` and a `pk` or `slug` argument in the URLconf. Subclasses can override this to return any object.

def get_object(self, queryset=None):
    """
    Return the object the view is displaying.
    Require `self.queryset` and a `pk` or `slug` argument in the URLconf.
    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 in the URLconf." % 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

Return the `QuerySet` that will be used to look up the object. This method is called by the default implementation of get_object() and may not be called if get_object() is overridden.

def get_queryset(self):
    """
    Return the `QuerySet` that will be used to look up the object.
    This method is called by the default implementation of get_object() and
    may not be called if get_object() is overridden.
    """
    if self.queryset is None:
        if self.model:
            return self.model._default_manager.all()
        else:
            raise ImproperlyConfigured(
                "%(cls)s is missing a QuerySet. Define "
                "%(cls)s.model, %(cls)s.queryset, or override "
                "%(cls)s.get_queryset()." % {
                    'cls': self.__class__.__name__
                }
            )
    return self.queryset.all()

Get the name of a slug field to be used to look up by slug.

def get_slug_field(self):
    """Get the name of a slug field to be used to look up by slug."""
    return self.slug_field