[英]Django unique together relationship with field and manytomany on self
我嘗試使用語言和內容來創建帖子,並將其與同一頁面的其他版本相關聯,但是我被卡住了
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',)
這將無法正常工作,因為Django不允許創建“唯一的” ManyToMany字段。
然后,我嘗試通過相關模型創建相同的關系:
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")
有誰知道如何在不使用symmetric = False的情況下做到這一點?
我認為您正在尋找這樣的東西:
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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