code: def create_entry_tag(sender, instance, created, **kwargs):
      
      from ..models import (
          Entry,
          EntryTag
      )
  
      entry   = Entry.objects.get_for_model(instance.content_object)[0]
      tag     = instance.tag
  
      if not EntryTag.objects.filter(tag=tag, entry=entry).exists():
          EntryTag.objects.create(tag=tag, entry=entry)
docs: Creates EntryTag for Entry corresponding to specified
      ItemBase instance.
  
      :param sender: the sending ItemBase class.
      :param instance: the ItemBase instance.