from django.contrib.contenttypes.fields import GenericRelation

from .models import get_comment_threads

class CommentableMixin:
    """
    Mixin for models that should have comment functionality.
    Uses composition instead of inheritance to avoid historical model issues.
    """
    
    @property
    def comments(self):
        """Get comments helper for this instance."""
        if self.__class__.__name__.startswith('Historical'):
            # Historical models delegate to their current instance
            return self.instance.comments
        return get_comment_threads(self)