英文:
Does django-mptt support nested models?
问题
以下是您提供的内容的中文翻译：
我有一个包含嵌套实体的数据库，实际上是关于部分的：街道-房屋-技术房间。换句话说，我想要在每个级别上具有不同属性的节点树。
我想要实现的是在这个数据库上使用django-mptt的功能，例如，我希望在Django Admin中将数据库视为树。
我在我的models.py中尝试了以下代码：
from django.db import modelsfrom mptt.models import MPTTModel, TreeForeignKeyclass Street(MPTTModel):name = models.CharField(max_length=100)parent = TreeForeignKey('self', on_delete=models.CASCADE, null=True, blank=True, related_name='streets')def __str__(self):return self.nameclass House(MPTTModel):name = models.CharField(max_length=100)parent = TreeForeignKey(Street, on_delete=models.CASCADE, null=True, blank=True, related_name='houses')def __str__(self):return self.nameclass TechRoom(MPTTModel):name = models.CharField(max_length=100)parent = TreeForeignKey(House, on_delete=models.CASCADE, null=True, blank=True, related_name='tech_rooms')def __str__(self):return self.name
以及我的admin.py如下：
from django.contrib import adminfrom mptt.admin import MPTTModelAdminfrom places.models import Street, House, TechRoomadmin.site.register(Street, MPTTModelAdmin)admin.site.register(House, MPTTModelAdmin)admin.site.register(TechRoom, MPTTModelAdmin)
问题是它像常规外键一样工作，而不是像树一样。是否可能使用django-mptt实现嵌套模型？更具体地说，是否可能在这里使用模型名称（例如Street）而不是'self'：
parent = TreeForeignKey(Street, on_delete=models.CASCADE, null=True, blank=True, related_name='houses')
英文:
I have a database of nested entities, that actually address parts: Street-House-Technical Room. In other words, I'd like to have a tree of nodes with different attributes on each level.
What I'd like to implement is to use django-mptt features for this database, for example, I want to see the database as a tree in Django Admin.
I tried the following in my models.py:
from django.db import modelsfrom mptt.models import MPTTModel, TreeForeignKeyclass Street(MPTTModel):name = models.CharField(max_length=100)parent = TreeForeignKey('self', on_delete=models.CASCADE, null=True, blank=True, related_name='streets')def __str__(self):return self.nameclass House(MPTTModel):name = models.CharField(max_length=100)parent = TreeForeignKey(Street, on_delete=models.CASCADE, null=True, blank=True, related_name='houses')def __str__(self):return self.nameclass TechRoom(MPTTModel):name = models.CharField(max_length=100)parent = TreeForeignKey(House, on_delete=models.CASCADE, null=True, blank=True, related_name='tech_rooms')def __str__(self):return self.name
and my admin.py looks as:
from django.contrib import adminfrom mptt.admin import MPTTModelAdminfrom places.models import Street, House, TechRoomadmin.site.register(Street, MPTTModelAdmin)admin.site.register(House, MPTTModelAdmin)admin.site.register(TechRoom, MPTTModelAdmin)
The problem is it works as a regular Foreign key not as a tree.
Is it possible to implement nested models using django-mptt?
More specifically is it possible to use a model name (e.g. Street) instead of 'self' here:
parent = TreeForeignKey(Street, on_delete=models.CASCADE, null=True, blank=True, related_name='houses')
答案1
得分: 0
我找到了所需的解决方案。它是django-polymorphic-tree库。
作者说：
> 您可以编写Django模型，形成树形结构，其中每个节点
> 可以是不同的模型类型。
它有效果。
英文:
I found the required solution. It is the django-polymorphic-tree library.
The author says:
> You can write Django models that form a tree structure where each node
> can be a different model type.
And it works.
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