old_contents: """info services."""
  from info.models import Article, News, Column
  
  
  def get_column_object(uid):
      """Get column object."""
      try:
          obj = Column.objects.get(uid=uid)
      except Column.DoesNotExist:
          obj = None
      return obj
  
  
  def get_articles_by_column(uid):
      """Get_articles_by_column."""
      queryset = Article.objects.filter(column__uid=uid).order_by('id')
  
      return queryset
  
  
  def get_columns_queryset():
      """Get_columns_queryset."""
      queryset = Column.objects.all().order_by('-id')
  
      return queryset
  
  
  def get_article_queryset():
      """Get article queryset."""
      queryset = Article.objects.all().order_by('-id')
  
      return queryset
  
  
  def get_article_object(uid):
      """Get article object."""
      return Article.objects.get(uid=uid)
  
  
  def get_news_queryset():
      """Get news queryset."""
      return News.objects.all().order_by('-id')
  
new_contents: """info services."""
  from info.models import Article, News, Column
  
  
  def get_column_object(uid):
      """Get column object."""
      try:
          obj = Column.objects.get(uid=uid)
      except Column.DoesNotExist:
          obj = None
      return obj
  
  
  def get_articles_by_column(uid):
      """Get_articles_by_column."""
      queryset = Article.objects.filter(
          column__uid=uid
      ).order_by('id')
  
      return queryset
  
  
  def get_columns_queryset():
      """Get_columns_queryset."""
      queryset = Column.objects.all().only('uid', 'name').order_by('-id')
  
      return queryset
  
  
  def get_article_queryset():
      """Get article queryset."""
      queryset = Article.objects.all().order_by('-id')
  
      return queryset
  
  
  def get_article_object(uid):
      """Get article object."""
      return Article.objects.get(uid=uid)
  
  
  def get_news_queryset():
      """Get news queryset."""
      return News.objects.all().order_by('-id')
  
subject: Modify django orm filter, add only