Question

的Django == 1.11.4

这个模型很好用：

//Add 2D content here
AnchorPane globalRoot = new AnchorPane();
globalRoot.getChildren().add(new Label("Hello World"));
Scene scene = new Scene(globalRoot, 1024, 768, true);

SubScene sub = new 
SubScene(root3D,1024,768,false,SceneAntialiasing.BALANCED);
sub.setCamera(camera);
globalRoot.getChildren().add(sub);

//Add all 3D content to the root3D node    

primaryStage.setScene(scene);
primaryStage.show();

但后来我想添加另一个也有FileField的模型。新模型看起来与此模型非常相似。唯一的区别是外键。

我确实喜欢这个：

class File(CommonUrlMethodsMixin,
           ItemIsMainMixin,
           models.Model):

    item = models.ForeignKey(Item, on_delete=models.PROTECT)

    user_file = models.FileField(blank=False,
                                 max_length=255,
                                 upload_to=get_file_path,
                                 verbose_name=_("file"))

    def __str__(self):
        if self.user_file.name:
            str_repr = "{}:{}".format(str(self.id), self.user_file.name)
        else:
            str_repr = str(self.id)
        return str_repr

我进行了迁移。

forms.py

class GeneralFileMixin():
    user_file = models.FileField(blank=False,
                                 max_length=255,
                                 upload_to=get_file_path,
                                 verbose_name=_("file"))

    def __str__(self):
        if self.user_file.name:
            str_repr = "{}:{}".format(str(self.id), self.user_file.name)
        else:
            str_repr = str(self.id)
        return str_repr    


class File(CommonUrlMethodsMixin,
           ItemIsMainMixin,
           GeneralFileMixin,
           models.Model):

    item = models.ForeignKey(Item, on_delete=models.PROTECT)

views.py

class FileForm(ModelForm):
    class Meta:
        model = File
        exclude = []
        widgets = {
            'item': forms.HiddenInput()
        }

但现在FileCreate没有显示文件的输入字段。

嗯，迁移就在这里：

class FileCreate(LoginRequiredMixin,
                 CreateView):
    model = File
    form_class = FileForm

好吧，它确实删除了user_file。但为什么没有考虑mixin中的user_file？

嗯，你能帮我一把吗？

Answer 1

您的新mixin应该继承models并需要添加abstarct=True

class GeneralFileMixin(models.Model):
    #                 ^^^^^^^^^^^^
    user_file = models.FileField(blank=False,
                                 max_length=255,
                                 upload_to=get_file_path,
                                 verbose_name=_("file"))

    class Meta:
        abstract = True
    #   ^^^^^^^^^^^^^^
    def __str__(self):
        if self.user_file.name:
            str_repr = "{}:{}".format(str(self.id), self.user_file.name)
        else:
            str_repr = str(self.id)
        return str_repr

推动一个字段和一个方法混合破坏了程序

1 个答案: