Django 注释反向关系

发布于 2024-07-24 01:58:05 字数 157 浏览 6 评论 0原文

当使用 django.contrib.comments 时，是否可以将反向关系添加到有注释的模型中？

例如：

post = Post.objects.all()[0]
comments = post.comments.all()

原文

When using django.contrib.comments is there anyway to add the reverse relationship to a model that has comments?

For example:

post = Post.objects.all()[0]
comments = post.comments.all()

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苦行僧 2024-07-31 01:58:05

是的，您应该能够执行以下操作：

from django.contrib.contenttypes import generic
class Post(models.Model):
    ...
    comments = generic.GenericRelation(Comments)

根据反向泛型关系

Yes, you should be able to do:

from django.contrib.contenttypes import generic
class Post(models.Model):
    ...
    comments = generic.GenericRelation(Comments)

per the Django docs on reverse generic relations

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梦开始←不甜 2024-07-31 01:58:05

我想出了另一种方法来做到这一点（为什么？因为当时我不知道有任何其他方法可以做到这一点）。它依赖于一个抽象模型类，系统中的所有模型都是从该抽象模型类派生的。抽象模型本身有一个方法，comments，定义为在调用时返回与相应具体对象关联的所有注释对象的 QuerySet。我是这样实现的：

from django.db import models
from django.contrib.contenttypes.models import ContentType
from django.contrib.comments.models import Comment

class AbstractModel(models.Model):

    def comments(self):
        """Return all comment objects for the instance."""
        ct = ContentType.objects.get(model=self.__class__.__name__)
        return Comment.objects.filter(content_type=ct,
                                    object_pk=self.id)

    class Meta:
        abstract = True

I came up with another way to do this (why? Because I wasn't aware of any other way to do that time). It relies on having an abstract model class from which all models in the system are derived. The abstract model itself has a method, comments, defined which when called returns a QuerySet of all the comment objects associated with the corresponding concrete object. I implemented it thus:

from django.db import models
from django.contrib.contenttypes.models import ContentType
from django.contrib.comments.models import Comment

class AbstractModel(models.Model):

    def comments(self):
        """Return all comment objects for the instance."""
        ct = ContentType.objects.get(model=self.__class__.__name__)
        return Comment.objects.filter(content_type=ct,
                                    object_pk=self.id)

    class Meta:
        abstract = True

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