quickapps / cms

        $field = $expression->getField();

        $column = is_string($field) ? $this->_toolbox->columnName($field) : '';

        if (empty($column) ||

            in_array($column, (array)$this->_table->schema()->columns()) || // ignore real columns

            !in_array($column, $this->_toolbox->getAttributeNames()) ||

            !$this->_toolbox->isSearchable($column) // ignore no searchable virtual columns

        ) {

            // nothing to alter

            return $expression;

        }

        $attr = $this->_toolbox->attributes($bundle)[$column];

        $value = $expression->getValue();

            $field = $value->getIdentifier();

            $column = is_string($field) ? $this->_toolbox->columnName($field) : '';

            if (empty($column) ||

                in_array($column, (array)$this->_table->schema()->columns()) || // ignore real columns

                !in_array($column, $this->_toolbox->getAttributeNames($bundle)) ||

                !$this->_toolbox->isSearchable($column) // ignore no searchable virtual columns

            ) {

                // nothing to alter

                return $expression;

            }

            $pk = $this->_tablePrimaryKey();

            $driverClass = $this->_driverClass($query);