docs: def get_list_url_filtered_by_field_value(view, model, name, reverse=False):
      """Get the URL if a filter of model[name] value was appended.
  
      This allows programatically adding filters. This is used in the specialized case
      of filtering deeper into a list by a field's value.
  
      For instance, since there can be multiple assignments in a list of handins. The
      assignment column can have a URL generated by get_filter_url to filter the handins
      to show only ones for that assignment.
  
      Parameters
      ----------
      view : View instance
      model : document (model instance, not the class itself)
      name : field name
      reverse : bool
          Whether to *remove* an applied filter from url
  
      Returns
      -------
      string : URL of current list args + filtering on field value
      """
  
      view_args = view._get_list_extra_args()
  
      def create_filter_arg(field_name, value):
          i, flt = next(
              (
                  v
                  for k, v in view._filter_args.items()
                  if k == '{}_equals'.format(field_name)
              ),
              None,
          )
          return (i, flt.name, value)
  
      new_filter = create_filter_arg(name, model[name])
      filters = view_args.filters
  
      if new_filter in view_args.filters:  # Filter already applied
          if not reverse:
              return None
          else:  # Remove filter
              filters.remove(new_filter)
  
      if not reverse:  # Add Filter
          filters.append(new_filter)
  
      # Example of an activated filter: (u'view_args.filters', [(7, u'Path', u'course')])
      return view._get_list_url(
          view_args.clone(filters=filters, page=0)  # Reset page to 0
      )