Django将默认值保存在代理模型中 [英] Django save default value in Proxy Model

问题描述

不同的代理模型的类型应该不同.如果我查询这些模型，我会选择正确的模型.

Different proxy models should be different in type. If I query those models I the right ones.

我正在尝试在代理模型中保存默认类型字段.我不想每次都在视图中设置它.

I am trying to save a default type field in a proxy model. I don't want to set it everytime in the view.

这不起作用.类型字段始终为"TYPE1".

This does not work. The type field is always "TYPE1".

models.py:

models.py:

class MyModel(models.Model):

    class ModelType(models.TextChoices):
        TYPE1 = 'TYPE1', _('TYPE1')
        TYPE2 = 'TYPE2', _('TYPE2')

    type = models.CharField(max_length=100, choices=ModelType.choices, default='TYPE1')


class Type2Manager(models.Manager):

    def get_queryset(self):
        return super(Type2Manager, self).get_queryset().filter(type='TYPE2')

    def save(self, *args, **kwargs):
        kwargs.update({'type': 'TYPE2'})
        return super(Type2Manager, self).save(*args, **kwargs)


class Type2ProxyModel(MyModel):
    class Meta:
        proxy = True

    objects = Type2Manager()

views.py:

def create_type2_model(request):
    form = Type2Form(request.POST, initial={})
    f = form.save(commit=False) 
    f.save()    

forms.py:

class Type2Form(ModelForm):

    class Meta:
        model = Type2ProxyModel

更新25.02.2020 12:18:

Update 25.02.2020 12:18:

我发现这设置了正确的类型.但是我不知道如何在ModelForm中使用create().

I found out that this sets the correct type. But I don't know how to use create() in a ModelForm.

class Type2Manager(models.Manager):

    ...

    def create(self, **kwargs):
        kwargs.update({'type': 'TYPE2'})
        return super(Type2Manager, self).create(**kwargs)

Type2ProxyModel.objects.create()

推荐答案

模型管理器在表级"上运行.当您通过表单创建对象时，它使用模型对象而不是模型管理器，因此您需要覆盖代理模型的 save .如果我将您的 Type2ProxyModel 修改为此，则会起作用:

A model manager operates on a "table-level". When you create an object via a form it uses the model objects and not the model manager and thus you'd need to override the save of your proxy model. If I modify your Type2ProxyModel to this it works:

class Type2ProxyModel(MyModel):
    class Meta:
        proxy = True

    objects = Type2Manager()

    def save(self, *args, **kwargs):
        self.type = 'TYPE2'
        return super(Type2ProxyModel, self).save(*args, **kwargs)

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