Django与字段和自身的众多关系具有独特的共同关系 [英] Django unique together relationship with field and manytomany on self

问题描述

我尝试使用语言和内容创建帖子，并将其与同一页面的其他版本相关联，但我陷入困境

I'm try create post with language and content, and relate it on other versions of same page, but I'm get stuck

class Page(models.Model):
    content = models.TextField()
    language = models.CharField(max_length=7, choices=settings.LANGUAGES)
    versions = models.ManyToManyField('self', blank=True)
    class Meta:
        unique_together = ('language', 'versions',)

这将无法正常工作，因为Django不允许创建唯一的" ManyToMany字段.

This will not work properly, because Django not allow make "unique" ManyToMany fields.

然后我尝试通过相关模型创建相同的关系:

Then I'm try make same relationship trough related model:

class VersionsPage(models.Model):
    pass
    # ToDo: add unique together here,  to foreign key field

class Page(models.Model):
    ...
    versions = models.ManyToManyField('self', blank=True, through="VersionsPage")

任何人都知道如何在不使用symmetrical = False的情况下做到这一点吗?

Anyone know how to make that without using symmetrical=False?

推荐答案

我认为您正在寻找这样的东西:

I think you are looking for something like this:

class Page(models.Model):
    pass

class PageVersion(models.Model):
    page = models.ForeignKey(Page, related_name='versions')
    content = models.TextField()
    language = models.CharField(max_length=7, choices=settings.LANGUAGES)

    class Meta:
        unique_together = ('page', 'language',)


#getting all page versions:
page = Page.objects.get(pk=some_id)
versions = page.versions.all()

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