models.py 文件源码

def share(self, profile):
        """Share this content as the profile given."""
        if self.content_type != ContentType.CONTENT:
            # TODO: support sharing replies too
            raise ValidationError("Can only share top level content.")
        if self.author == profile:
            raise ValidationError("Cannot share own content")
        if not self.visible_for_user(profile.user):
            raise ValidationError("Content to be shared is not visible to sharer.")
        if self.shares.filter(author=profile).exists():
            raise ValidationError("Profile has already shared this content.")
        # Use get or created as a safety to stop duplicates
        share, _created = Content.objects.get_or_create(author=profile, share_of=self, defaults={
            "visibility": self.visibility,
        })
        delete_memoized(Content.has_shared, self.id, profile.id)
        return share