code: function via($column) {
  		$this->column = $column;
  		$this->conditions[0] = "$this->table.$column AND";
  		$this->where[0] = "(" . $this->whereIn("$this->table.$column", array_keys((array) $this->result->rows)) . ")";
  		return $this;
  	}
docs: Specify referencing column
  @param string
  @return NotORM_MultiResult fluent interface