code: def only_for(theme, redirect_to='/', raise_error=None):
      
      def check_theme(*args, **kwargs):
          if isinstance(theme, six.string_types):
              themes = (theme,)
          else:
              themes = theme
  
          if settings.CURRENT_THEME is None:
              return True
  
          result = settings.CURRENT_THEME in themes
  
          if not result and raise_error is not None:
              raise raise_error
  
          return result
  
      return user_passes_test(check_theme, login_url=redirect_to)
docs: Decorator for restrict access to views according by list of themes.
  
      Params:
  
          * ``theme`` - string or list of themes where decorated view must be
          * ``redirect_to`` - url or name of url pattern for redirect
              if CURRENT_THEME not in themes
          * ``raise_error`` - error class for raising
  
      Example:
  
      .. code:: python
  
          # views.py
  
          from django_vest import only_for
  
          @only_for('black_theme')
          def my_view(request):
              ...