code: function(el) {
  
          var $el = this.$(el);
  
          if ($el.length === 0 || $el[0] === this.el) {
  
              // If the overall cell has set `magnet === false`, then return `undefined` to
              // announce there is no magnet found for this cell.
              // This is especially useful to set on cells that have 'ports'. In this case,
              // only the ports have set `magnet === true` and the overall element has `magnet === false`.
              var attrs = this.model.get('attrs') || {};
              if (attrs['.'] && attrs['.']['magnet'] === false) {
                  return undefined;
              }
  
              return this.el;
          }
  
          if ($el.attr('magnet')) {
  
              return $el[0];
          }
  
          return this.findMagnet($el.parent());
      }
docs: Find the closest element that has the `magnet` attribute set to `true`. If there was not such an element found, return the root element of the cell view.