Question

在用户删除了PieceInstance之后，我想将他重定向到PieceInstance所属的Piece。我使用默认的DeleteView，并希望将部件ID（通过ForeignKey引用的PieceInstance的部件）传递给get_success_url方法。 self.piece.pk似乎没有获得相应作品的ID。

models.py

class PieceInstance(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, help_text='Unique ID for this particular Piece across whole system')
    piece = models.ForeignKey('Piece', on_delete=models.SET_NULL, null=True) 
    ...

class Piece(models.Model):
    title = models.CharField(max_length=200)
    ...

views.py

class PieceInstanceDelete(LoginRequiredMixin, DeleteView):
    model = PieceInstance
    def get_success_url(self):
        return reverse_lazy('piece-detail', kwargs={'pk': self.piece.pk})

urls.py

path('piece/<int:pk>', views.PieceDetailView.as_view(), name='piece-detail')

Answer 1

根据源代码，对象被删除之前存储在self.object 中。因此，您可以使用以下命令重定向到相关piece的主键：

class PieceInstanceDelete(LoginRequiredMixin, DeleteView):
    model = PieceInstance

    def get_success_url(self):
        return reverse_lazy('piece-detail', kwargs={'pk': self.object.piece_id})

但是问题是这是 undocumented ，因此以后可能会重写Django视图而没有这种行为。

万一这种行为不再发生，可能值得修补delete函数：

#  probably not necessary, but there is no "contract" that the above will
#  always work

class PieceInstanceDelete(LoginRequiredMixin, DeleteView):
    model = PieceInstance

    def delete(self, *args, **kwargs):
        self.object = self.get_object()
        super().delete(*args, **kwargs)

    def get_success_url(self):
        return reverse_lazy('piece-detail', kwargs={'pk': self.object.piece_id})

Answer 2

使用以下答案得到它： DeleteView with a dynamic success_url dependent on id

此处为DeleteView类：

class PieceInstanceDelete(LoginRequiredMixin, DeleteView):
    model = PieceInstance
    def get_success_url(self):
        piece = self.object.piece
        return reverse_lazy('piece-detail', kwargs={'pk': piece.pk})

Django：DeleteView将参数从ForeignKey的模型传递给get_success_url

2 个答案: